/* Copyright (C) 2000-2004 MySQL AB This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /* drop and alter of tables */ #include "mysql_priv.h" #include <hash.h> #include <myisam.h> #include <my_dir.h> #include "sp_head.h" #include "sql_trigger.h" #include "sql_show.h" #ifdef __WIN__ #include <io.h> #endif int creating_table= 0; // How many mysql_create_table are running const char *primary_key_name="PRIMARY"; static bool check_if_keyname_exists(const char *name,KEY *start, KEY *end); static char *make_unique_key_name(const char *field_name,KEY *start,KEY *end); static int copy_data_between_tables(TABLE *from,TABLE *to, List<Create_field> &create, bool ignore, uint order_num, ORDER *order, ha_rows *copied,ha_rows *deleted, enum enum_enable_or_disable keys_onoff, bool error_if_not_empty); static bool prepare_blob_field(THD *thd, Create_field *sql_field); static bool check_engine(THD *, const char *, HA_CREATE_INFO *); static bool mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info, Alter_info *alter_info, bool tmp_table, uint *db_options, handler *file, KEY **key_info_buffer, uint *key_count, int select_field_count); static bool mysql_prepare_alter_table(THD *thd, TABLE *table, HA_CREATE_INFO *create_info, Alter_info *alter_info); #ifndef DBUG_OFF /* Wait until we get a 'mysql_kill' signal */ static void wait_for_kill_signal(THD *thd) { while (thd->killed == 0) sleep(1); // Reset signal and continue as if nothing happend thd->killed= THD::NOT_KILLED; } #endif /* Translate a file name to a table name (WL #1324). SYNOPSIS filename_to_tablename() from The file name in my_charset_filename. to OUT The table name in system_charset_info. to_length The size of the table name buffer. RETURN Table name length. */ uint filename_to_tablename(const char *from, char *to, uint to_length) { uint errors; uint res; DBUG_ENTER("filename_to_tablename"); DBUG_PRINT("enter", ("from '%s'", from)); if (!memcmp(from, tmp_file_prefix, tmp_file_prefix_length)) { /* Temporary table name. */ res= (strnmov(to, from, to_length) - to); } else { res= strconvert(&my_charset_filename, from, system_charset_info, to, to_length, &errors); if (errors) // Old 5.0 name { res= (strxnmov(to, to_length, MYSQL50_TABLE_NAME_PREFIX, from, NullS) - to); sql_print_error("Invalid (old?) table or database name '%s'", from); /* TODO: add a stored procedure for fix table and database names, and mention its name in error log. */ } } DBUG_PRINT("exit", ("to '%s'", to)); DBUG_RETURN(res); } /* Translate a table name to a file name (WL #1324). SYNOPSIS tablename_to_filename() from The table name in system_charset_info. to OUT The file name in my_charset_filename. to_length The size of the file name buffer. RETURN File name length. */ uint tablename_to_filename(const char *from, char *to, uint to_length) { uint errors, length; DBUG_ENTER("tablename_to_filename"); DBUG_PRINT("enter", ("from '%s'", from)); if (from[0] == '#' && !strncmp(from, MYSQL50_TABLE_NAME_PREFIX, MYSQL50_TABLE_NAME_PREFIX_LENGTH)) DBUG_RETURN((uint) (strmake(to, from+MYSQL50_TABLE_NAME_PREFIX_LENGTH, to_length-1) - (from + MYSQL50_TABLE_NAME_PREFIX_LENGTH))); length= strconvert(system_charset_info, from, &my_charset_filename, to, to_length, &errors); if (check_if_legal_tablename(to) && length + 4 < to_length) { memcpy(to + length, "@@@", 4); length+= 3; } DBUG_PRINT("exit", ("to '%s'", to)); DBUG_RETURN(length); } /* Creates path to a file: mysql_data_dir/db/table.ext SYNOPSIS build_table_filename() buff Where to write result in my_charset_filename. This may be the same as table_name. bufflen buff size db Database name in system_charset_info. table_name Table name in system_charset_info. ext File extension. flags FN_FROM_IS_TMP or FN_TO_IS_TMP or FN_IS_TMP table_name is temporary, do not change. NOTES Uses database and table name, and extension to create a file name in mysql_data_dir. Database and table names are converted from system_charset_info into "fscs". Unless flags indicate a temporary table name. 'db' is always converted. 'ext' is not converted. The conversion suppression is required for ALTER TABLE. This statement creates intermediate tables. These are regular (non-temporary) tables with a temporary name. Their path names must be derivable from the table name. So we cannot use build_tmptable_filename() for them. RETURN path length */ uint build_table_filename(char *buff, size_t bufflen, const char *db, const char *table_name, const char *ext, uint flags) { char dbbuff[FN_REFLEN]; char tbbuff[FN_REFLEN]; DBUG_ENTER("build_table_filename"); DBUG_PRINT("enter", ("db: '%s' table_name: '%s' ext: '%s' flags: %x", db, table_name, ext, flags)); if (flags & FN_IS_TMP) // FN_FROM_IS_TMP | FN_TO_IS_TMP strnmov(tbbuff, table_name, sizeof(tbbuff)); else VOID(tablename_to_filename(table_name, tbbuff, sizeof(tbbuff))); VOID(tablename_to_filename(db, dbbuff, sizeof(dbbuff))); char *end = buff + bufflen; /* Don't add FN_ROOTDIR if mysql_data_home already includes it */ char *pos = strnmov(buff, mysql_data_home, bufflen); int rootdir_len= strlen(FN_ROOTDIR); if (pos - rootdir_len >= buff && memcmp(pos - rootdir_len, FN_ROOTDIR, rootdir_len) != 0) pos= strnmov(pos, FN_ROOTDIR, end - pos); pos= strxnmov(pos, end - pos, dbbuff, FN_ROOTDIR, tbbuff, ext, NullS); DBUG_PRINT("exit", ("buff: '%s'", buff)); DBUG_RETURN(pos - buff); } /* Creates path to a file: mysql_tmpdir/#sql1234_12_1.ext SYNOPSIS build_tmptable_filename() thd The thread handle. buff Where to write result in my_charset_filename. bufflen buff size NOTES Uses current_pid, thread_id, and tmp_table counter to create a file name in mysql_tmpdir. RETURN path length */ uint build_tmptable_filename(THD* thd, char *buff, size_t bufflen) { DBUG_ENTER("build_tmptable_filename"); char *p= strnmov(buff, mysql_tmpdir, bufflen); my_snprintf(p, bufflen - (p - buff), "/%s%lx_%lx_%x%s", tmp_file_prefix, current_pid, thd->thread_id, thd->tmp_table++, reg_ext); if (lower_case_table_names) { /* Convert all except tmpdir to lower case */ my_casedn_str(files_charset_info, p); } uint length= unpack_filename(buff, buff); DBUG_PRINT("exit", ("buff: '%s'", buff)); DBUG_RETURN(length); } /* -------------------------------------------------------------------------- MODULE: DDL log ----------------- This module is used to ensure that we can recover from crashes that occur in the middle of a meta-data operation in MySQL. E.g. DROP TABLE t1, t2; We need to ensure that both t1 and t2 are dropped and not only t1 and also that each table drop is entirely done and not "half-baked". To support this we create log entries for each meta-data statement in the ddl log while we are executing. These entries are dropped when the operation is completed. At recovery those entries that were not completed will be executed. There is only one ddl log in the system and it is protected by a mutex and there is a global struct that contains information about its current state. History: First version written in 2006 by Mikael Ronstrom -------------------------------------------------------------------------- */ typedef struct st_global_ddl_log { /* We need to adjust buffer size to be able to handle downgrades/upgrades where IO_SIZE has changed. We'll set the buffer size such that we can handle that the buffer size was upto 4 times bigger in the version that wrote the DDL log. */ char file_entry_buf[4*IO_SIZE]; char file_name_str[FN_REFLEN]; char *file_name; DDL_LOG_MEMORY_ENTRY *first_free; DDL_LOG_MEMORY_ENTRY *first_used; uint num_entries; File file_id; uint name_len; uint io_size; bool inited; bool recovery_phase; } GLOBAL_DDL_LOG; GLOBAL_DDL_LOG global_ddl_log; pthread_mutex_t LOCK_gdl; #define DDL_LOG_ENTRY_TYPE_POS 0 #define DDL_LOG_ACTION_TYPE_POS 1 #define DDL_LOG_PHASE_POS 2 #define DDL_LOG_NEXT_ENTRY_POS 4 #define DDL_LOG_NAME_POS 8 #define DDL_LOG_NUM_ENTRY_POS 0 #define DDL_LOG_NAME_LEN_POS 4 #define DDL_LOG_IO_SIZE_POS 8 /* Read one entry from ddl log file SYNOPSIS read_ddl_log_file_entry() entry_no Entry number to read RETURN VALUES TRUE Error FALSE Success */ static bool read_ddl_log_file_entry(uint entry_no) { bool error= FALSE; File file_id= global_ddl_log.file_id; uchar *file_entry_buf= (uchar*)global_ddl_log.file_entry_buf; uint io_size= global_ddl_log.io_size; DBUG_ENTER("read_ddl_log_file_entry"); if (my_pread(file_id, file_entry_buf, io_size, io_size * entry_no, MYF(MY_WME)) != io_size) error= TRUE; DBUG_RETURN(error); } /* Write one entry from ddl log file SYNOPSIS write_ddl_log_file_entry() entry_no Entry number to read RETURN VALUES TRUE Error FALSE Success */ static bool write_ddl_log_file_entry(uint entry_no) { bool error= FALSE; File file_id= global_ddl_log.file_id; char *file_entry_buf= (char*)global_ddl_log.file_entry_buf; DBUG_ENTER("write_ddl_log_file_entry"); if (my_pwrite(file_id, (uchar*)file_entry_buf, IO_SIZE, IO_SIZE * entry_no, MYF(MY_WME)) != IO_SIZE) error= TRUE; DBUG_RETURN(error); } /* Write ddl log header SYNOPSIS write_ddl_log_header() RETURN VALUES TRUE Error FALSE Success */ static bool write_ddl_log_header() { uint16 const_var; bool error= FALSE; DBUG_ENTER("write_ddl_log_header"); int4store(&global_ddl_log.file_entry_buf[DDL_LOG_NUM_ENTRY_POS], global_ddl_log.num_entries); const_var= FN_LEN; int4store(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_LEN_POS], (ulong) const_var); const_var= IO_SIZE; int4store(&global_ddl_log.file_entry_buf[DDL_LOG_IO_SIZE_POS], (ulong) const_var); if (write_ddl_log_file_entry(0UL)) { sql_print_error("Error writing ddl log header"); DBUG_RETURN(TRUE); } VOID(sync_ddl_log()); DBUG_RETURN(error); } /* Create ddl log file name SYNOPSIS create_ddl_log_file_name() file_name Filename setup RETURN VALUES NONE */ static inline void create_ddl_log_file_name(char *file_name) { strxmov(file_name, mysql_data_home, "/", "ddl_log.log", NullS); } /* Read header of ddl log file SYNOPSIS read_ddl_log_header() RETURN VALUES > 0 Last entry in ddl log 0 No entries in ddl log DESCRIPTION When we read the ddl log header we get information about maximum sizes of names in the ddl log and we also get information about the number of entries in the ddl log. */ static uint read_ddl_log_header() { char *file_entry_buf= (char*)global_ddl_log.file_entry_buf; char file_name[FN_REFLEN]; uint entry_no; bool successful_open= FALSE; DBUG_ENTER("read_ddl_log_header"); create_ddl_log_file_name(file_name); if ((global_ddl_log.file_id= my_open(file_name, O_RDWR | O_BINARY, MYF(MY_WME))) >= 0) { if (read_ddl_log_file_entry(0UL)) { /* Write message into error log */ sql_print_error("Failed to read ddl log file in recovery"); } else successful_open= TRUE; } entry_no= uint4korr(&file_entry_buf[DDL_LOG_NUM_ENTRY_POS]); global_ddl_log.name_len= uint4korr(&file_entry_buf[DDL_LOG_NAME_LEN_POS]); if (successful_open) { global_ddl_log.io_size= uint4korr(&file_entry_buf[DDL_LOG_IO_SIZE_POS]); DBUG_ASSERT(global_ddl_log.io_size <= sizeof(global_ddl_log.file_entry_buf)); } else { entry_no= 0; } global_ddl_log.first_free= NULL; global_ddl_log.first_used= NULL; global_ddl_log.num_entries= 0; VOID(pthread_mutex_init(&LOCK_gdl, MY_MUTEX_INIT_FAST)); DBUG_RETURN(entry_no); } /* Read a ddl log entry SYNOPSIS read_ddl_log_entry() read_entry Number of entry to read out:entry_info Information from entry RETURN VALUES TRUE Error FALSE Success DESCRIPTION Read a specified entry in the ddl log */ bool read_ddl_log_entry(uint read_entry, DDL_LOG_ENTRY *ddl_log_entry) { char *file_entry_buf= (char*)&global_ddl_log.file_entry_buf; uint inx; uchar single_char; DBUG_ENTER("read_ddl_log_entry"); if (read_ddl_log_file_entry(read_entry)) { DBUG_RETURN(TRUE); } ddl_log_entry->entry_pos= read_entry; single_char= file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]; ddl_log_entry->entry_type= (enum ddl_log_entry_code)single_char; single_char= file_entry_buf[DDL_LOG_ACTION_TYPE_POS]; ddl_log_entry->action_type= (enum ddl_log_action_code)single_char; ddl_log_entry->phase= file_entry_buf[DDL_LOG_PHASE_POS]; ddl_log_entry->next_entry= uint4korr(&file_entry_buf[DDL_LOG_NEXT_ENTRY_POS]); ddl_log_entry->name= &file_entry_buf[DDL_LOG_NAME_POS]; inx= DDL_LOG_NAME_POS + global_ddl_log.name_len; ddl_log_entry->from_name= &file_entry_buf[inx]; inx+= global_ddl_log.name_len; ddl_log_entry->handler_name= &file_entry_buf[inx]; DBUG_RETURN(FALSE); } /* Initialise ddl log SYNOPSIS init_ddl_log() DESCRIPTION Write the header of the ddl log file and length of names. Also set number of entries to zero. RETURN VALUES TRUE Error FALSE Success */ static bool init_ddl_log() { char file_name[FN_REFLEN]; DBUG_ENTER("init_ddl_log"); if (global_ddl_log.inited) goto end; global_ddl_log.io_size= IO_SIZE; create_ddl_log_file_name(file_name); if ((global_ddl_log.file_id= my_create(file_name, CREATE_MODE, O_RDWR | O_TRUNC | O_BINARY, MYF(MY_WME))) < 0) { /* Couldn't create ddl log file, this is serious error */ sql_print_error("Failed to open ddl log file"); DBUG_RETURN(TRUE); } global_ddl_log.inited= TRUE; if (write_ddl_log_header()) { VOID(my_close(global_ddl_log.file_id, MYF(MY_WME))); global_ddl_log.inited= FALSE; DBUG_RETURN(TRUE); } end: DBUG_RETURN(FALSE); } /* Execute one action in a ddl log entry SYNOPSIS execute_ddl_log_action() ddl_log_entry Information in action entry to execute RETURN VALUES TRUE Error FALSE Success */ static int execute_ddl_log_action(THD *thd, DDL_LOG_ENTRY *ddl_log_entry) { bool frm_action= FALSE; LEX_STRING handler_name; handler *file= NULL; MEM_ROOT mem_root; int error= TRUE; char to_path[FN_REFLEN]; char from_path[FN_REFLEN]; #ifdef WITH_PARTITION_STORAGE_ENGINE char *par_ext= (char*)".par"; #endif handlerton *hton; DBUG_ENTER("execute_ddl_log_action"); if (ddl_log_entry->entry_type == DDL_IGNORE_LOG_ENTRY_CODE) { DBUG_RETURN(FALSE); } handler_name.str= (char*)ddl_log_entry->handler_name; handler_name.length= strlen(ddl_log_entry->handler_name); init_sql_alloc(&mem_root, TABLE_ALLOC_BLOCK_SIZE, 0); if (!strcmp(ddl_log_entry->handler_name, reg_ext)) frm_action= TRUE; else { plugin_ref plugin= ha_resolve_by_name(thd, &handler_name); if (!plugin) { my_error(ER_ILLEGAL_HA, MYF(0), ddl_log_entry->handler_name); goto error; } hton= plugin_data(plugin, handlerton*); file= get_new_handler((TABLE_SHARE*)0, &mem_root, hton); if (!file) { mem_alloc_error(sizeof(handler)); goto error; } } switch (ddl_log_entry->action_type) { case DDL_LOG_REPLACE_ACTION: case DDL_LOG_DELETE_ACTION: { if (ddl_log_entry->phase == 0) { if (frm_action) { strxmov(to_path, ddl_log_entry->name, reg_ext, NullS); if ((error= my_delete(to_path, MYF(MY_WME)))) { if (my_errno != ENOENT) break; } #ifdef WITH_PARTITION_STORAGE_ENGINE strxmov(to_path, ddl_log_entry->name, par_ext, NullS); VOID(my_delete(to_path, MYF(MY_WME))); #endif } else { if ((error= file->delete_table(ddl_log_entry->name))) { if (error != ENOENT && error != HA_ERR_NO_SUCH_TABLE) break; } } if ((deactivate_ddl_log_entry(ddl_log_entry->entry_pos))) break; VOID(sync_ddl_log()); error= FALSE; if (ddl_log_entry->action_type == DDL_LOG_DELETE_ACTION) break; } DBUG_ASSERT(ddl_log_entry->action_type == DDL_LOG_REPLACE_ACTION); /* Fall through and perform the rename action of the replace action. We have already indicated the success of the delete action in the log entry by stepping up the phase. */ } case DDL_LOG_RENAME_ACTION: { error= TRUE; if (frm_action) { strxmov(to_path, ddl_log_entry->name, reg_ext, NullS); strxmov(from_path, ddl_log_entry->from_name, reg_ext, NullS); if (my_rename(from_path, to_path, MYF(MY_WME))) break; #ifdef WITH_PARTITION_STORAGE_ENGINE strxmov(to_path, ddl_log_entry->name, par_ext, NullS); strxmov(from_path, ddl_log_entry->from_name, par_ext, NullS); VOID(my_rename(from_path, to_path, MYF(MY_WME))); #endif } else { if (file->rename_table(ddl_log_entry->from_name, ddl_log_entry->name)) break; } if ((deactivate_ddl_log_entry(ddl_log_entry->entry_pos))) break; VOID(sync_ddl_log()); error= FALSE; break; } default: DBUG_ASSERT(0); break; } delete file; error: free_root(&mem_root, MYF(0)); DBUG_RETURN(error); } /* Get a free entry in the ddl log SYNOPSIS get_free_ddl_log_entry() out:active_entry A ddl log memory entry returned RETURN VALUES TRUE Error FALSE Success */ static bool get_free_ddl_log_entry(DDL_LOG_MEMORY_ENTRY **active_entry, bool *write_header) { DDL_LOG_MEMORY_ENTRY *used_entry; DDL_LOG_MEMORY_ENTRY *first_used= global_ddl_log.first_used; DBUG_ENTER("get_free_ddl_log_entry"); if (global_ddl_log.first_free == NULL) { if (!(used_entry= (DDL_LOG_MEMORY_ENTRY*)my_malloc( sizeof(DDL_LOG_MEMORY_ENTRY), MYF(MY_WME)))) { sql_print_error("Failed to allocate memory for ddl log free list"); DBUG_RETURN(TRUE); } global_ddl_log.num_entries++; used_entry->entry_pos= global_ddl_log.num_entries; *write_header= TRUE; } else { used_entry= global_ddl_log.first_free; global_ddl_log.first_free= used_entry->next_log_entry; *write_header= FALSE; } /* Move from free list to used list */ used_entry->next_log_entry= first_used; used_entry->prev_log_entry= NULL; global_ddl_log.first_used= used_entry; if (first_used) first_used->prev_log_entry= used_entry; *active_entry= used_entry; DBUG_RETURN(FALSE); } /* External interface methods for the DDL log Module --------------------------------------------------- */ /* SYNOPSIS write_ddl_log_entry() ddl_log_entry Information about log entry out:entry_written Entry information written into RETURN VALUES TRUE Error FALSE Success DESCRIPTION A careful write of the ddl log is performed to ensure that we can handle crashes occurring during CREATE and ALTER TABLE processing. */ bool write_ddl_log_entry(DDL_LOG_ENTRY *ddl_log_entry, DDL_LOG_MEMORY_ENTRY **active_entry) { bool error, write_header; DBUG_ENTER("write_ddl_log_entry"); if (init_ddl_log()) { DBUG_RETURN(TRUE); } global_ddl_log.file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]= (char)DDL_LOG_ENTRY_CODE; global_ddl_log.file_entry_buf[DDL_LOG_ACTION_TYPE_POS]= (char)ddl_log_entry->action_type; global_ddl_log.file_entry_buf[DDL_LOG_PHASE_POS]= 0; int4store(&global_ddl_log.file_entry_buf[DDL_LOG_NEXT_ENTRY_POS], ddl_log_entry->next_entry); DBUG_ASSERT(strlen(ddl_log_entry->name) < FN_LEN); strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS], ddl_log_entry->name, FN_LEN - 1); if (ddl_log_entry->action_type == DDL_LOG_RENAME_ACTION || ddl_log_entry->action_type == DDL_LOG_REPLACE_ACTION) { DBUG_ASSERT(strlen(ddl_log_entry->from_name) < FN_LEN); strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + FN_LEN], ddl_log_entry->from_name, FN_LEN - 1); } else global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + FN_LEN]= 0; DBUG_ASSERT(strlen(ddl_log_entry->handler_name) < FN_LEN); strmake(&global_ddl_log.file_entry_buf[DDL_LOG_NAME_POS + (2*FN_LEN)], ddl_log_entry->handler_name, FN_LEN - 1); if (get_free_ddl_log_entry(active_entry, &write_header)) { DBUG_RETURN(TRUE); } error= FALSE; if (write_ddl_log_file_entry((*active_entry)->entry_pos)) { error= TRUE; sql_print_error("Failed to write entry_no = %u", (*active_entry)->entry_pos); } if (write_header && !error) { VOID(sync_ddl_log()); if (write_ddl_log_header()) error= TRUE; } if (error) release_ddl_log_memory_entry(*active_entry); DBUG_RETURN(error); } /* Write final entry in the ddl log SYNOPSIS write_execute_ddl_log_entry() first_entry First entry in linked list of entries to execute, if 0 = NULL it means that the entry is removed and the entries are put into the free list. complete Flag indicating we are simply writing info about that entry has been completed in:out:active_entry Entry to execute, 0 = NULL if the entry is written first time and needs to be returned. In this case the entry written is returned in this parameter RETURN VALUES TRUE Error FALSE Success DESCRIPTION This is the last write in the ddl log. The previous log entries have already been written but not yet synched to disk. We write a couple of log entries that describes action to perform. This entries are set-up in a linked list, however only when a first execute entry is put as the first entry these will be executed. This routine writes this first */ bool write_execute_ddl_log_entry(uint first_entry, bool complete, DDL_LOG_MEMORY_ENTRY **active_entry) { bool write_header= FALSE; char *file_entry_buf= (char*)global_ddl_log.file_entry_buf; DBUG_ENTER("write_execute_ddl_log_entry"); if (init_ddl_log()) { DBUG_RETURN(TRUE); } if (!complete) { /* We haven't synched the log entries yet, we synch them now before writing the execute entry. If complete is true we haven't written any log entries before, we are only here to write the execute entry to indicate it is done. */ VOID(sync_ddl_log()); file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]= (char)DDL_LOG_EXECUTE_CODE; } else file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]= (char)DDL_IGNORE_LOG_ENTRY_CODE; file_entry_buf[DDL_LOG_ACTION_TYPE_POS]= 0; /* Ignored for execute entries */ file_entry_buf[DDL_LOG_PHASE_POS]= 0; int4store(&file_entry_buf[DDL_LOG_NEXT_ENTRY_POS], first_entry); file_entry_buf[DDL_LOG_NAME_POS]= 0; file_entry_buf[DDL_LOG_NAME_POS + FN_LEN]= 0; file_entry_buf[DDL_LOG_NAME_POS + 2*FN_LEN]= 0; if (!(*active_entry)) { if (get_free_ddl_log_entry(active_entry, &write_header)) { DBUG_RETURN(TRUE); } } if (write_ddl_log_file_entry((*active_entry)->entry_pos)) { sql_print_error("Error writing execute entry in ddl log"); release_ddl_log_memory_entry(*active_entry); DBUG_RETURN(TRUE); } VOID(sync_ddl_log()); if (write_header) { if (write_ddl_log_header()) { release_ddl_log_memory_entry(*active_entry); DBUG_RETURN(TRUE); } } DBUG_RETURN(FALSE); } /* For complex rename operations we need to deactivate individual entries. SYNOPSIS deactivate_ddl_log_entry() entry_no Entry position of record to change RETURN VALUES TRUE Error FALSE Success DESCRIPTION During replace operations where we start with an existing table called t1 and a replacement table called t1#temp or something else and where we want to delete t1 and rename t1#temp to t1 this is not possible to do in a safe manner unless the ddl log is informed of the phases in the change. Delete actions are 1-phase actions that can be ignored immediately after being executed. Rename actions from x to y is also a 1-phase action since there is no interaction with any other handlers named x and y. Replace action where drop y and x -> y happens needs to be a two-phase action. Thus the first phase will drop y and the second phase will rename x -> y. */ bool deactivate_ddl_log_entry(uint entry_no) { char *file_entry_buf= (char*)global_ddl_log.file_entry_buf; DBUG_ENTER("deactivate_ddl_log_entry"); if (!read_ddl_log_file_entry(entry_no)) { if (file_entry_buf[DDL_LOG_ENTRY_TYPE_POS] == DDL_LOG_ENTRY_CODE) { if (file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_DELETE_ACTION || file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_RENAME_ACTION || (file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_REPLACE_ACTION && file_entry_buf[DDL_LOG_PHASE_POS] == 1)) file_entry_buf[DDL_LOG_ENTRY_TYPE_POS]= DDL_IGNORE_LOG_ENTRY_CODE; else if (file_entry_buf[DDL_LOG_ACTION_TYPE_POS] == DDL_LOG_REPLACE_ACTION) { DBUG_ASSERT(file_entry_buf[DDL_LOG_PHASE_POS] == 0); file_entry_buf[DDL_LOG_PHASE_POS]= 1; } else { DBUG_ASSERT(0); } if (write_ddl_log_file_entry(entry_no)) { sql_print_error("Error in deactivating log entry. Position = %u", entry_no); DBUG_RETURN(TRUE); } } } else { sql_print_error("Failed in reading entry before deactivating it"); DBUG_RETURN(TRUE); } DBUG_RETURN(FALSE); } /* Sync ddl log file SYNOPSIS sync_ddl_log() RETURN VALUES TRUE Error FALSE Success */ bool sync_ddl_log() { bool error= FALSE; DBUG_ENTER("sync_ddl_log"); if ((!global_ddl_log.recovery_phase) && init_ddl_log()) { DBUG_RETURN(TRUE); } if (my_sync(global_ddl_log.file_id, MYF(0))) { /* Write to error log */ sql_print_error("Failed to sync ddl log"); error= TRUE; } DBUG_RETURN(error); } /* Release a log memory entry SYNOPSIS release_ddl_log_memory_entry() log_memory_entry Log memory entry to release RETURN VALUES NONE */ void release_ddl_log_memory_entry(DDL_LOG_MEMORY_ENTRY *log_entry) { DDL_LOG_MEMORY_ENTRY *first_free= global_ddl_log.first_free; DDL_LOG_MEMORY_ENTRY *next_log_entry= log_entry->next_log_entry; DDL_LOG_MEMORY_ENTRY *prev_log_entry= log_entry->prev_log_entry; DBUG_ENTER("release_ddl_log_memory_entry"); global_ddl_log.first_free= log_entry; log_entry->next_log_entry= first_free; if (prev_log_entry) prev_log_entry->next_log_entry= next_log_entry; else global_ddl_log.first_used= next_log_entry; if (next_log_entry) next_log_entry->prev_log_entry= prev_log_entry; DBUG_VOID_RETURN; } /* Execute one entry in the ddl log. Executing an entry means executing a linked list of actions. SYNOPSIS execute_ddl_log_entry() first_entry Reference to first action in entry RETURN VALUES TRUE Error FALSE Success */ bool execute_ddl_log_entry(THD *thd, uint first_entry) { DDL_LOG_ENTRY ddl_log_entry; uint read_entry= first_entry; DBUG_ENTER("execute_ddl_log_entry"); pthread_mutex_lock(&LOCK_gdl); do { if (read_ddl_log_entry(read_entry, &ddl_log_entry)) { /* Write to error log and continue with next log entry */ sql_print_error("Failed to read entry = %u from ddl log", read_entry); break; } DBUG_ASSERT(ddl_log_entry.entry_type == DDL_LOG_ENTRY_CODE || ddl_log_entry.entry_type == DDL_IGNORE_LOG_ENTRY_CODE); if (execute_ddl_log_action(thd, &ddl_log_entry)) { /* Write to error log and continue with next log entry */ sql_print_error("Failed to execute action for entry = %u from ddl log", read_entry); break; } read_entry= ddl_log_entry.next_entry; } while (read_entry); pthread_mutex_unlock(&LOCK_gdl); DBUG_RETURN(FALSE); } /* Close the ddl log SYNOPSIS close_ddl_log() RETURN VALUES NONE */ static void close_ddl_log() { DBUG_ENTER("close_ddl_log"); if (global_ddl_log.file_id >= 0) { VOID(my_close(global_ddl_log.file_id, MYF(MY_WME))); global_ddl_log.file_id= (File) -1; } DBUG_VOID_RETURN; } /* Execute the ddl log at recovery of MySQL Server SYNOPSIS execute_ddl_log_recovery() RETURN VALUES NONE */ void execute_ddl_log_recovery() { uint num_entries, i; THD *thd; DDL_LOG_ENTRY ddl_log_entry; char file_name[FN_REFLEN]; DBUG_ENTER("execute_ddl_log_recovery"); /* Initialise global_ddl_log struct */ bzero(global_ddl_log.file_entry_buf, sizeof(global_ddl_log.file_entry_buf)); global_ddl_log.inited= FALSE; global_ddl_log.recovery_phase= TRUE; global_ddl_log.io_size= IO_SIZE; global_ddl_log.file_id= (File) -1; /* To be able to run this from boot, we allocate a temporary THD */ if (!(thd=new THD)) DBUG_VOID_RETURN; thd->thread_stack= (char*) &thd; thd->store_globals(); num_entries= read_ddl_log_header(); for (i= 1; i < num_entries + 1; i++) { if (read_ddl_log_entry(i, &ddl_log_entry)) { sql_print_error("Failed to read entry no = %u from ddl log", i); continue; } if (ddl_log_entry.entry_type == DDL_LOG_EXECUTE_CODE) { if (execute_ddl_log_entry(thd, ddl_log_entry.next_entry)) { /* Real unpleasant scenario but we continue anyways. */ continue; } } } close_ddl_log(); create_ddl_log_file_name(file_name); VOID(my_delete(file_name, MYF(0))); global_ddl_log.recovery_phase= FALSE; delete thd; /* Remember that we don't have a THD */ my_pthread_setspecific_ptr(THR_THD, 0); DBUG_VOID_RETURN; } /* Release all memory allocated to the ddl log SYNOPSIS release_ddl_log() RETURN VALUES NONE */ void release_ddl_log() { DDL_LOG_MEMORY_ENTRY *free_list= global_ddl_log.first_free; DDL_LOG_MEMORY_ENTRY *used_list= global_ddl_log.first_used; DBUG_ENTER("release_ddl_log"); pthread_mutex_lock(&LOCK_gdl); while (used_list) { DDL_LOG_MEMORY_ENTRY *tmp= used_list->next_log_entry; my_free(used_list, MYF(0)); used_list= tmp; } while (free_list) { DDL_LOG_MEMORY_ENTRY *tmp= free_list->next_log_entry; my_free(free_list, MYF(0)); free_list= tmp; } close_ddl_log(); global_ddl_log.inited= 0; pthread_mutex_unlock(&LOCK_gdl); VOID(pthread_mutex_destroy(&LOCK_gdl)); DBUG_VOID_RETURN; } /* --------------------------------------------------------------------------- END MODULE DDL log -------------------- --------------------------------------------------------------------------- */ /** @brief construct a temporary shadow file name. @details Make a shadow file name used by ALTER TABLE to construct the modified table (with keeping the original). The modified table is then moved back as original table. The name must start with the temp file prefix so it gets filtered out by table files listing routines. @param[out] buff buffer to receive the constructed name @param bufflen size of buff @param lpt alter table data structure @retval path length */ uint build_table_shadow_filename(char *buff, size_t bufflen, ALTER_PARTITION_PARAM_TYPE *lpt) { char tmp_name[FN_REFLEN]; my_snprintf (tmp_name, sizeof (tmp_name), "%s-%s", tmp_file_prefix, lpt->table_name); return build_table_filename(buff, bufflen, lpt->db, tmp_name, "", FN_IS_TMP); } /* SYNOPSIS mysql_write_frm() lpt Struct carrying many parameters needed for this method flags Flags as defined below WFRM_INITIAL_WRITE If set we need to prepare table before creating the frm file WFRM_CREATE_HANDLER_FILES If set we need to create the handler file as part of the creation of the frm file WFRM_PACK_FRM If set we should pack the frm file and delete the frm file RETURN VALUES TRUE Error FALSE Success DESCRIPTION A support method that creates a new frm file and in this process it regenerates the partition data. It works fine also for non-partitioned tables since it only handles partitioned data if it exists. */ bool mysql_write_frm(ALTER_PARTITION_PARAM_TYPE *lpt, uint flags) { /* Prepare table to prepare for writing a new frm file where the partitions in add/drop state have temporarily changed their state We set tmp_table to avoid get errors on naming of primary key index. */ int error= 0; char path[FN_REFLEN+1]; char shadow_path[FN_REFLEN+1]; char shadow_frm_name[FN_REFLEN+1]; char frm_name[FN_REFLEN+1]; DBUG_ENTER("mysql_write_frm"); /* Build shadow frm file name */ build_table_shadow_filename(shadow_path, sizeof(shadow_path), lpt); strxmov(shadow_frm_name, shadow_path, reg_ext, NullS); if (flags & WFRM_WRITE_SHADOW) { if (mysql_prepare_create_table(lpt->thd, lpt->create_info, lpt->alter_info, /*tmp_table*/ 1, &lpt->db_options, lpt->table->file, &lpt->key_info_buffer, &lpt->key_count, /*select_field_count*/ 0)) { DBUG_RETURN(TRUE); } #ifdef WITH_PARTITION_STORAGE_ENGINE { partition_info *part_info= lpt->table->part_info; char *part_syntax_buf; uint syntax_len; if (part_info) { TABLE_SHARE *share= lpt->table->s; if (!(part_syntax_buf= generate_partition_syntax(part_info, &syntax_len, TRUE, TRUE))) { DBUG_RETURN(TRUE); } part_info->part_info_string= part_syntax_buf; share->partition_info_len= part_info->part_info_len= syntax_len; if (share->partition_info_buffer_size < syntax_len + 1) { share->partition_info_buffer_size= syntax_len+1; if (!(share->partition_info= (char*) alloc_root(&share->mem_root, syntax_len+1))) DBUG_RETURN(TRUE); } memcpy((char*) share->partition_info, part_syntax_buf, syntax_len + 1); } } #endif /* Write shadow frm file */ lpt->create_info->table_options= lpt->db_options; if ((mysql_create_frm(lpt->thd, shadow_frm_name, lpt->db, lpt->table_name, lpt->create_info, lpt->alter_info->create_list, lpt->key_count, lpt->key_info_buffer, lpt->table->file)) || lpt->table->file->create_handler_files(shadow_path, NULL, CHF_CREATE_FLAG, lpt->create_info)) { my_delete(shadow_frm_name, MYF(0)); error= 1; goto end; } } if (flags & WFRM_PACK_FRM) { /* We need to pack the frm file and after packing it we delete the frm file to ensure it doesn't get used. This is only used for handlers that have the main version of the frm file stored in the handler. */ uchar *data; size_t length; if (readfrm(shadow_path, &data, &length) || packfrm(data, length, &lpt->pack_frm_data, &lpt->pack_frm_len)) { my_free(data, MYF(MY_ALLOW_ZERO_PTR)); my_free(lpt->pack_frm_data, MYF(MY_ALLOW_ZERO_PTR)); mem_alloc_error(length); error= 1; goto end; } error= my_delete(shadow_frm_name, MYF(MY_WME)); } if (flags & WFRM_INSTALL_SHADOW) { #ifdef WITH_PARTITION_STORAGE_ENGINE partition_info *part_info= lpt->part_info; #endif /* Build frm file name */ build_table_filename(path, sizeof(path), lpt->db, lpt->table_name, "", 0); strxmov(frm_name, path, reg_ext, NullS); /* When we are changing to use new frm file we need to ensure that we don't collide with another thread in process to open the frm file. We start by deleting the .frm file and possible .par file. Then we write to the DDL log that we have completed the delete phase by increasing the phase of the log entry. Next step is to rename the new .frm file and the new .par file to the real name. After completing this we write a new phase to the log entry that will deactivate it. */ VOID(pthread_mutex_lock(&LOCK_open)); if (my_delete(frm_name, MYF(MY_WME)) || #ifdef WITH_PARTITION_STORAGE_ENGINE lpt->table->file->create_handler_files(path, shadow_path, CHF_DELETE_FLAG, NULL) || deactivate_ddl_log_entry(part_info->frm_log_entry->entry_pos) || (sync_ddl_log(), FALSE) || #endif #ifdef WITH_PARTITION_STORAGE_ENGINE my_rename(shadow_frm_name, frm_name, MYF(MY_WME)) || lpt->table->file->create_handler_files(path, shadow_path, CHF_RENAME_FLAG, NULL)) #else my_rename(shadow_frm_name, frm_name, MYF(MY_WME))) #endif { error= 1; } VOID(pthread_mutex_unlock(&LOCK_open)); #ifdef WITH_PARTITION_STORAGE_ENGINE deactivate_ddl_log_entry(part_info->frm_log_entry->entry_pos); part_info->frm_log_entry= NULL; VOID(sync_ddl_log()); #endif } end: DBUG_RETURN(error); } /* SYNOPSIS write_bin_log() thd Thread object clear_error is clear_error to be called query Query to log query_length Length of query RETURN VALUES NONE DESCRIPTION Write the binlog if open, routine used in multiple places in this file */ void write_bin_log(THD *thd, bool clear_error, char const *query, ulong query_length) { if (mysql_bin_log.is_open()) { if (clear_error) thd->clear_error(); thd->binlog_query(THD::STMT_QUERY_TYPE, query, query_length, FALSE, FALSE); } } /* delete (drop) tables. SYNOPSIS mysql_rm_table() thd Thread handle tables List of tables to delete if_exists If 1, don't give error if one table doesn't exists NOTES Will delete all tables that can be deleted and give a compact error messages for tables that could not be deleted. If a table is in use, we will wait for all users to free the table before dropping it Wait if global_read_lock (FLUSH TABLES WITH READ LOCK) is set. RETURN FALSE OK. In this case ok packet is sent to user TRUE Error */ bool mysql_rm_table(THD *thd,TABLE_LIST *tables, my_bool if_exists, my_bool drop_temporary) { bool error= FALSE, need_start_waiters= FALSE; DBUG_ENTER("mysql_rm_table"); /* mark for close and remove all cached entries */ if (!drop_temporary) { if ((error= wait_if_global_read_lock(thd, 0, 1))) { my_error(ER_TABLE_NOT_LOCKED_FOR_WRITE, MYF(0), tables->table_name); DBUG_RETURN(TRUE); } else need_start_waiters= TRUE; } /* Acquire LOCK_open after wait_if_global_read_lock(). If we would hold LOCK_open during wait_if_global_read_lock(), other threads could not close their tables. This would make a pretty deadlock. */ error= mysql_rm_table_part2(thd, tables, if_exists, drop_temporary, 0, 0); if (need_start_waiters) start_waiting_global_read_lock(thd); if (error) DBUG_RETURN(TRUE); send_ok(thd); DBUG_RETURN(FALSE); } /* Execute the drop of a normal or temporary table SYNOPSIS mysql_rm_table_part2() thd Thread handler tables Tables to drop if_exists If set, don't give an error if table doesn't exists. In this case we give an warning of level 'NOTE' drop_temporary Only drop temporary tables drop_view Allow to delete VIEW .frm dont_log_query Don't write query to log files. This will also not generate warnings if the handler files doesn't exists TODO: When logging to the binary log, we should log tmp_tables and transactional tables as separate statements if we are in a transaction; This is needed to get these tables into the cached binary log that is only written on COMMIT. The current code only writes DROP statements that only uses temporary tables to the cache binary log. This should be ok on most cases, but not all. RETURN 0 ok 1 Error -1 Thread was killed */ int mysql_rm_table_part2(THD *thd, TABLE_LIST *tables, bool if_exists, bool drop_temporary, bool drop_view, bool dont_log_query) { TABLE_LIST *table; char path[FN_REFLEN], *alias; uint path_length; String wrong_tables; int error; int non_temp_tables_count= 0; bool some_tables_deleted=0, tmp_table_deleted=0, foreign_key_error=0; String built_query; DBUG_ENTER("mysql_rm_table_part2"); LINT_INIT(alias); LINT_INIT(path_length); if (thd->current_stmt_binlog_row_based && !dont_log_query) { built_query.set_charset(system_charset_info); if (if_exists) built_query.append("DROP TABLE IF EXISTS "); else built_query.append("DROP TABLE "); } pthread_mutex_lock(&LOCK_open); /* If we have the table in the definition cache, we don't have to check the .frm file to find if the table is a normal table (not view) and what engine to use. */ for (table= tables; table; table= table->next_local) { TABLE_SHARE *share; table->db_type= NULL; if ((share= get_cached_table_share(table->db, table->table_name))) table->db_type= share->db_type(); /* Disable drop of enabled log tables */ if (share && (share->table_category == TABLE_CATEGORY_PERFORMANCE) && check_if_log_table(table->db_length, table->db, table->table_name_length, table->table_name, 1)) { my_error(ER_BAD_LOG_STATEMENT, MYF(0), "DROP"); pthread_mutex_unlock(&LOCK_open); DBUG_RETURN(1); } } if (!drop_temporary && lock_table_names_exclusively(thd, tables)) { pthread_mutex_unlock(&LOCK_open); DBUG_RETURN(1); } /* Don't give warnings for not found errors, as we already generate notes */ thd->no_warnings_for_error= 1; for (table= tables; table; table= table->next_local) { char *db=table->db; handlerton *table_type; enum legacy_db_type frm_db_type; mysql_ha_flush(thd, table, MYSQL_HA_CLOSE_FINAL, 1); if (!close_temporary_table(thd, table)) { tmp_table_deleted=1; continue; // removed temporary table } /* If row-based replication is used and the table is not a temporary table, we add the table name to the drop statement being built. The string always end in a comma and the comma will be chopped off before being written to the binary log. */ if (thd->current_stmt_binlog_row_based && !dont_log_query) { non_temp_tables_count++; /* Don't write the database name if it is the current one (or if thd->db is NULL). */ built_query.append("`"); if (thd->db == NULL || strcmp(db,thd->db) != 0) { built_query.append(db); built_query.append("`.`"); } built_query.append(table->table_name); built_query.append("`,"); } error=0; table_type= table->db_type; if (!drop_temporary) { TABLE *locked_table; abort_locked_tables(thd, db, table->table_name); remove_table_from_cache(thd, db, table->table_name, RTFC_WAIT_OTHER_THREAD_FLAG | RTFC_CHECK_KILLED_FLAG); /* If the table was used in lock tables, remember it so that unlock_table_names can free it */ if ((locked_table= drop_locked_tables(thd, db, table->table_name))) table->table= locked_table; if (thd->killed) { error= -1; goto err_with_placeholders; } alias= (lower_case_table_names == 2) ? table->alias : table->table_name; /* remove .frm file and engine files */ path_length= build_table_filename(path, sizeof(path), db, alias, reg_ext, 0); } if (drop_temporary || (table_type == NULL && (access(path, F_OK) && ha_create_table_from_engine(thd, db, alias)) || (!drop_view && mysql_frm_type(thd, path, &frm_db_type) != FRMTYPE_TABLE))) { // Table was not found on disk and table can't be created from engine if (if_exists) push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_BAD_TABLE_ERROR, ER(ER_BAD_TABLE_ERROR), table->table_name); else error= 1; } else { char *end; if (table_type == NULL) { mysql_frm_type(thd, path, &frm_db_type); table_type= ha_resolve_by_legacy_type(thd, frm_db_type); } // Remove extension for delete *(end= path + path_length - reg_ext_length)= '\0'; error= ha_delete_table(thd, table_type, path, db, table->table_name, !dont_log_query); if ((error == ENOENT || error == HA_ERR_NO_SUCH_TABLE) && (if_exists || table_type == NULL)) error= 0; if (error == HA_ERR_ROW_IS_REFERENCED) { /* the table is referenced by a foreign key constraint */ foreign_key_error=1; } if (!error || error == ENOENT || error == HA_ERR_NO_SUCH_TABLE) { int new_error; /* Delete the table definition file */ strmov(end,reg_ext); if (!(new_error=my_delete(path,MYF(MY_WME)))) { some_tables_deleted=1; new_error= Table_triggers_list::drop_all_triggers(thd, db, table->table_name); } error|= new_error; } } if (error) { if (wrong_tables.length()) wrong_tables.append(','); wrong_tables.append(String(table->table_name,system_charset_info)); } } /* It's safe to unlock LOCK_open: we have an exclusive lock on the table name. */ pthread_mutex_unlock(&LOCK_open); thd->thread_specific_used|= tmp_table_deleted; error= 0; if (wrong_tables.length()) { if (!foreign_key_error) my_printf_error(ER_BAD_TABLE_ERROR, ER(ER_BAD_TABLE_ERROR), MYF(0), wrong_tables.c_ptr()); else my_message(ER_ROW_IS_REFERENCED, ER(ER_ROW_IS_REFERENCED), MYF(0)); error= 1; } if (some_tables_deleted || tmp_table_deleted || !error) { query_cache_invalidate3(thd, tables, 0); if (!dont_log_query) { if (!thd->current_stmt_binlog_row_based || non_temp_tables_count > 0 && !tmp_table_deleted) { /* In this case, we are either using statement-based replication or using row-based replication but have only deleted one or more non-temporary tables (and no temporary tables). In this case, we can write the original query into the binary log. */ write_bin_log(thd, !error, thd->query, thd->query_length); } else if (thd->current_stmt_binlog_row_based && non_temp_tables_count > 0 && tmp_table_deleted) { /* In this case we have deleted both temporary and non-temporary tables, so: - since we have deleted a non-temporary table we have to binlog the statement, but - since we have deleted a temporary table we cannot binlog the statement (since the table has not been created on the slave, this might cause the slave to stop). Instead, we write a built statement, only containing the non-temporary tables, to the binary log */ built_query.chop(); // Chop of the last comma built_query.append(" /* generated by server */"); write_bin_log(thd, !error, built_query.ptr(), built_query.length()); } /* The remaining cases are: - no tables where deleted and - only temporary tables where deleted and row-based replication is used. In both these cases, nothing should be written to the binary log. */ } } pthread_mutex_lock(&LOCK_open); err_with_placeholders: unlock_table_names(thd, tables, (TABLE_LIST*) 0); pthread_mutex_unlock(&LOCK_open); thd->no_warnings_for_error= 0; DBUG_RETURN(error); } /* Quickly remove a table. SYNOPSIS quick_rm_table() base The handlerton handle. db The database name. table_name The table name. flags flags for build_table_filename(). RETURN 0 OK != 0 Error */ bool quick_rm_table(handlerton *base,const char *db, const char *table_name, uint flags) { char path[FN_REFLEN]; bool error= 0; DBUG_ENTER("quick_rm_table"); uint path_length= build_table_filename(path, sizeof(path), db, table_name, reg_ext, flags); if (my_delete(path,MYF(0))) error= 1; /* purecov: inspected */ path[path_length - reg_ext_length]= '\0'; // Remove reg_ext DBUG_RETURN(ha_delete_table(current_thd, base, path, db, table_name, 0) || error); } /* Sort keys in the following order: - PRIMARY KEY - UNIQUE keyws where all column are NOT NULL - Other UNIQUE keys - Normal keys - Fulltext keys This will make checking for duplicated keys faster and ensure that PRIMARY keys are prioritized. */ static int sort_keys(KEY *a, KEY *b) { if (a->flags & HA_NOSAME) { if (!(b->flags & HA_NOSAME)) return -1; if ((a->flags ^ b->flags) & (HA_NULL_PART_KEY | HA_END_SPACE_KEY)) { /* Sort NOT NULL keys before other keys */ return (a->flags & (HA_NULL_PART_KEY | HA_END_SPACE_KEY)) ? 1 : -1; } if (a->name == primary_key_name) return -1; if (b->name == primary_key_name) return 1; } else if (b->flags & HA_NOSAME) return 1; // Prefer b if ((a->flags ^ b->flags) & HA_FULLTEXT) { return (a->flags & HA_FULLTEXT) ? 1 : -1; } /* Prefer original key order. usable_key_parts contains here the original key position. */ return ((a->usable_key_parts < b->usable_key_parts) ? -1 : (a->usable_key_parts > b->usable_key_parts) ? 1 : 0); } /* Check TYPELIB (set or enum) for duplicates SYNOPSIS check_duplicates_in_interval() set_or_name "SET" or "ENUM" string for warning message name name of the checked column typelib list of values for the column dup_val_count returns count of duplicate elements DESCRIPTION This function prints an warning for each value in list which has some duplicates on its right RETURN VALUES 0 ok 1 Error */ bool check_duplicates_in_interval(const char *set_or_name, const char *name, TYPELIB *typelib, CHARSET_INFO *cs, unsigned int *dup_val_count) { TYPELIB tmp= *typelib; const char **cur_value= typelib->type_names; unsigned int *cur_length= typelib->type_lengths; *dup_val_count= 0; for ( ; tmp.count > 1; cur_value++, cur_length++) { tmp.type_names++; tmp.type_lengths++; tmp.count--; if (find_type2(&tmp, (const char*)*cur_value, *cur_length, cs)) { if ((current_thd->variables.sql_mode & (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES))) { my_error(ER_DUPLICATED_VALUE_IN_TYPE, MYF(0), name,*cur_value,set_or_name); return 1; } push_warning_printf(current_thd,MYSQL_ERROR::WARN_LEVEL_NOTE, ER_DUPLICATED_VALUE_IN_TYPE, ER(ER_DUPLICATED_VALUE_IN_TYPE), name,*cur_value,set_or_name); (*dup_val_count)++; } } return 0; } /* Check TYPELIB (set or enum) max and total lengths SYNOPSIS calculate_interval_lengths() cs charset+collation pair of the interval typelib list of values for the column max_length length of the longest item tot_length sum of the item lengths DESCRIPTION After this function call: - ENUM uses max_length - SET uses tot_length. RETURN VALUES void */ void calculate_interval_lengths(CHARSET_INFO *cs, TYPELIB *interval, uint32 *max_length, uint32 *tot_length) { const char **pos; uint *len; *max_length= *tot_length= 0; for (pos= interval->type_names, len= interval->type_lengths; *pos ; pos++, len++) { uint length= cs->cset->numchars(cs, *pos, *pos + *len); *tot_length+= length; set_if_bigger(*max_length, (uint32)length); } } /* Prepare a create_table instance for packing SYNOPSIS prepare_create_field() sql_field field to prepare for packing blob_columns count for BLOBs timestamps count for timestamps table_flags table flags DESCRIPTION This function prepares a Create_field instance. Fields such as pack_flag are valid after this call. RETURN VALUES 0 ok 1 Error */ int prepare_create_field(Create_field *sql_field, uint *blob_columns, int *timestamps, int *timestamps_with_niladic, longlong table_flags) { unsigned int dup_val_count; DBUG_ENTER("prepare_field"); /* This code came from mysql_prepare_create_table. Indent preserved to make patching easier */ DBUG_ASSERT(sql_field->charset); switch (sql_field->sql_type) { case MYSQL_TYPE_BLOB: case MYSQL_TYPE_MEDIUM_BLOB: case MYSQL_TYPE_TINY_BLOB: case MYSQL_TYPE_LONG_BLOB: sql_field->pack_flag=FIELDFLAG_BLOB | pack_length_to_packflag(sql_field->pack_length - portable_sizeof_char_ptr); if (sql_field->charset->state & MY_CS_BINSORT) sql_field->pack_flag|=FIELDFLAG_BINARY; sql_field->length=8; // Unireg field length sql_field->unireg_check=Field::BLOB_FIELD; (*blob_columns)++; break; case MYSQL_TYPE_GEOMETRY: #ifdef HAVE_SPATIAL if (!(table_flags & HA_CAN_GEOMETRY)) { my_printf_error(ER_CHECK_NOT_IMPLEMENTED, ER(ER_CHECK_NOT_IMPLEMENTED), MYF(0), "GEOMETRY"); DBUG_RETURN(1); } sql_field->pack_flag=FIELDFLAG_GEOM | pack_length_to_packflag(sql_field->pack_length - portable_sizeof_char_ptr); if (sql_field->charset->state & MY_CS_BINSORT) sql_field->pack_flag|=FIELDFLAG_BINARY; sql_field->length=8; // Unireg field length sql_field->unireg_check=Field::BLOB_FIELD; (*blob_columns)++; break; #else my_printf_error(ER_FEATURE_DISABLED,ER(ER_FEATURE_DISABLED), MYF(0), sym_group_geom.name, sym_group_geom.needed_define); DBUG_RETURN(1); #endif /*HAVE_SPATIAL*/ case MYSQL_TYPE_VARCHAR: #ifndef QQ_ALL_HANDLERS_SUPPORT_VARCHAR if (table_flags & HA_NO_VARCHAR) { /* convert VARCHAR to CHAR because handler is not yet up to date */ sql_field->sql_type= MYSQL_TYPE_VAR_STRING; sql_field->pack_length= calc_pack_length(sql_field->sql_type, (uint) sql_field->length); if ((sql_field->length / sql_field->charset->mbmaxlen) > MAX_FIELD_CHARLENGTH) { my_printf_error(ER_TOO_BIG_FIELDLENGTH, ER(ER_TOO_BIG_FIELDLENGTH), MYF(0), sql_field->field_name, MAX_FIELD_CHARLENGTH); DBUG_RETURN(1); } } #endif /* fall through */ case MYSQL_TYPE_STRING: sql_field->pack_flag=0; if (sql_field->charset->state & MY_CS_BINSORT) sql_field->pack_flag|=FIELDFLAG_BINARY; break; case MYSQL_TYPE_ENUM: sql_field->pack_flag=pack_length_to_packflag(sql_field->pack_length) | FIELDFLAG_INTERVAL; if (sql_field->charset->state & MY_CS_BINSORT) sql_field->pack_flag|=FIELDFLAG_BINARY; sql_field->unireg_check=Field::INTERVAL_FIELD; if (check_duplicates_in_interval("ENUM",sql_field->field_name, sql_field->interval, sql_field->charset, &dup_val_count)) DBUG_RETURN(1); break; case MYSQL_TYPE_SET: sql_field->pack_flag=pack_length_to_packflag(sql_field->pack_length) | FIELDFLAG_BITFIELD; if (sql_field->charset->state & MY_CS_BINSORT) sql_field->pack_flag|=FIELDFLAG_BINARY; sql_field->unireg_check=Field::BIT_FIELD; if (check_duplicates_in_interval("SET",sql_field->field_name, sql_field->interval, sql_field->charset, &dup_val_count)) DBUG_RETURN(1); /* Check that count of unique members is not more then 64 */ if (sql_field->interval->count - dup_val_count > sizeof(longlong)*8) { my_error(ER_TOO_BIG_SET, MYF(0), sql_field->field_name); DBUG_RETURN(1); } break; case MYSQL_TYPE_DATE: // Rest of string types case MYSQL_TYPE_NEWDATE: case MYSQL_TYPE_TIME: case MYSQL_TYPE_DATETIME: case MYSQL_TYPE_NULL: sql_field->pack_flag=f_settype((uint) sql_field->sql_type); break; case MYSQL_TYPE_BIT: /* We have sql_field->pack_flag already set here, see mysql_prepare_create_table(). */ break; case MYSQL_TYPE_NEWDECIMAL: sql_field->pack_flag=(FIELDFLAG_NUMBER | (sql_field->flags & UNSIGNED_FLAG ? 0 : FIELDFLAG_DECIMAL) | (sql_field->flags & ZEROFILL_FLAG ? FIELDFLAG_ZEROFILL : 0) | (sql_field->decimals << FIELDFLAG_DEC_SHIFT)); break; case MYSQL_TYPE_TIMESTAMP: /* We should replace old TIMESTAMP fields with their newer analogs */ if (sql_field->unireg_check == Field::TIMESTAMP_OLD_FIELD) { if (!*timestamps) { sql_field->unireg_check= Field::TIMESTAMP_DNUN_FIELD; (*timestamps_with_niladic)++; } else sql_field->unireg_check= Field::NONE; } else if (sql_field->unireg_check != Field::NONE) (*timestamps_with_niladic)++; (*timestamps)++; /* fall-through */ default: sql_field->pack_flag=(FIELDFLAG_NUMBER | (sql_field->flags & UNSIGNED_FLAG ? 0 : FIELDFLAG_DECIMAL) | (sql_field->flags & ZEROFILL_FLAG ? FIELDFLAG_ZEROFILL : 0) | f_settype((uint) sql_field->sql_type) | (sql_field->decimals << FIELDFLAG_DEC_SHIFT)); break; } if (!(sql_field->flags & NOT_NULL_FLAG)) sql_field->pack_flag|= FIELDFLAG_MAYBE_NULL; if (sql_field->flags & NO_DEFAULT_VALUE_FLAG) sql_field->pack_flag|= FIELDFLAG_NO_DEFAULT; DBUG_RETURN(0); } /* Preparation for table creation SYNOPSIS mysql_prepare_create_table() thd Thread object. create_info Create information (like MAX_ROWS). alter_info List of columns and indexes to create tmp_table If a temporary table is to be created. db_options INOUT Table options (like HA_OPTION_PACK_RECORD). file The handler for the new table. key_info_buffer OUT An array of KEY structs for the indexes. key_count OUT The number of elements in the array. select_field_count The number of fields coming from a select table. DESCRIPTION Prepares the table and key structures for table creation. NOTES sets create_info->varchar if the table has a varchar RETURN VALUES FALSE OK TRUE error */ static bool mysql_prepare_create_table(THD *thd, HA_CREATE_INFO *create_info, Alter_info *alter_info, bool tmp_table, uint *db_options, handler *file, KEY **key_info_buffer, uint *key_count, int select_field_count) { const char *key_name; Create_field *sql_field,*dup_field; uint field,null_fields,blob_columns,max_key_length; ulong record_offset= 0; KEY *key_info; KEY_PART_INFO *key_part_info; int timestamps= 0, timestamps_with_niladic= 0; int field_no,dup_no; int select_field_pos,auto_increment=0; List_iterator<Create_field> it(alter_info->create_list); List_iterator<Create_field> it2(alter_info->create_list); uint total_uneven_bit_length= 0; DBUG_ENTER("mysql_prepare_create_table"); select_field_pos= alter_info->create_list.elements - select_field_count; null_fields=blob_columns=0; create_info->varchar= 0; max_key_length= file->max_key_length(); for (field_no=0; (sql_field=it++) ; field_no++) { CHARSET_INFO *save_cs; /* Initialize length from its original value (number of characters), which was set in the parser. This is necessary if we're executing a prepared statement for the second time. */ sql_field->length= sql_field->char_length; if (!sql_field->charset) sql_field->charset= create_info->default_table_charset; /* table_charset is set in ALTER TABLE if we want change character set for all varchar/char columns. But the table charset must not affect the BLOB fields, so don't allow to change my_charset_bin to somethig else. */ if (create_info->table_charset && sql_field->charset != &my_charset_bin) sql_field->charset= create_info->table_charset; save_cs= sql_field->charset; if ((sql_field->flags & BINCMP_FLAG) && !(sql_field->charset= get_charset_by_csname(sql_field->charset->csname, MY_CS_BINSORT,MYF(0)))) { char tmp[64]; strmake(strmake(tmp, save_cs->csname, sizeof(tmp)-4), STRING_WITH_LEN("_bin")); my_error(ER_UNKNOWN_COLLATION, MYF(0), tmp); DBUG_RETURN(TRUE); } /* Convert the default value from client character set into the column character set if necessary. */ if (sql_field->def && save_cs != sql_field->def->collation.collation && (sql_field->sql_type == MYSQL_TYPE_VAR_STRING || sql_field->sql_type == MYSQL_TYPE_STRING || sql_field->sql_type == MYSQL_TYPE_SET || sql_field->sql_type == MYSQL_TYPE_ENUM)) { /* Starting from 5.1 we work here with a copy of Create_field created by the caller, not with the instance that was originally created during parsing. It's OK to create a temporary item and initialize with it a member of the copy -- this item will be thrown away along with the copy at the end of execution, and thus not introduce a dangling pointer in the parsed tree of a prepared statement or a stored procedure statement. */ sql_field->def= sql_field->def->safe_charset_converter(save_cs); if (sql_field->def == NULL) { /* Could not convert */ my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name); DBUG_RETURN(TRUE); } } if (sql_field->sql_type == MYSQL_TYPE_SET || sql_field->sql_type == MYSQL_TYPE_ENUM) { uint32 dummy; CHARSET_INFO *cs= sql_field->charset; TYPELIB *interval= sql_field->interval; /* Create typelib from interval_list, and if necessary convert strings from client character set to the column character set. */ if (!interval) { /* Create the typelib in runtime memory - we will free the occupied memory at the same time when we free this sql_field -- at the end of execution. */ interval= sql_field->interval= typelib(thd->mem_root, sql_field->interval_list); List_iterator<String> int_it(sql_field->interval_list); String conv, *tmp; char comma_buf[2]; int comma_length= cs->cset->wc_mb(cs, ',', (uchar*) comma_buf, (uchar*) comma_buf + sizeof(comma_buf)); DBUG_ASSERT(comma_length > 0); for (uint i= 0; (tmp= int_it++); i++) { uint lengthsp; if (String::needs_conversion(tmp->length(), tmp->charset(), cs, &dummy)) { uint cnv_errs; conv.copy(tmp->ptr(), tmp->length(), tmp->charset(), cs, &cnv_errs); interval->type_names[i]= strmake_root(thd->mem_root, conv.ptr(), conv.length()); interval->type_lengths[i]= conv.length(); } // Strip trailing spaces. lengthsp= cs->cset->lengthsp(cs, interval->type_names[i], interval->type_lengths[i]); interval->type_lengths[i]= lengthsp; ((uchar *)interval->type_names[i])[lengthsp]= '\0'; if (sql_field->sql_type == MYSQL_TYPE_SET) { if (cs->coll->instr(cs, interval->type_names[i], interval->type_lengths[i], comma_buf, comma_length, NULL, 0)) { my_error(ER_ILLEGAL_VALUE_FOR_TYPE, MYF(0), "set", tmp->ptr()); DBUG_RETURN(TRUE); } } } sql_field->interval_list.empty(); // Don't need interval_list anymore } if (sql_field->sql_type == MYSQL_TYPE_SET) { uint32 field_length; if (sql_field->def != NULL) { char *not_used; uint not_used2; bool not_found= 0; String str, *def= sql_field->def->val_str(&str); if (def == NULL) /* SQL "NULL" maps to NULL */ { if ((sql_field->flags & NOT_NULL_FLAG) != 0) { my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name); DBUG_RETURN(TRUE); } /* else, NULL is an allowed value */ (void) find_set(interval, NULL, 0, cs, ¬_used, ¬_used2, ¬_found); } else /* not NULL */ { (void) find_set(interval, def->ptr(), def->length(), cs, ¬_used, ¬_used2, ¬_found); } if (not_found) { my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name); DBUG_RETURN(TRUE); } } calculate_interval_lengths(cs, interval, &dummy, &field_length); sql_field->length= field_length + (interval->count - 1); } else /* MYSQL_TYPE_ENUM */ { uint32 field_length; DBUG_ASSERT(sql_field->sql_type == MYSQL_TYPE_ENUM); if (sql_field->def != NULL) { String str, *def= sql_field->def->val_str(&str); if (def == NULL) /* SQL "NULL" maps to NULL */ { if ((sql_field->flags & NOT_NULL_FLAG) != 0) { my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name); DBUG_RETURN(TRUE); } /* else, the defaults yield the correct length for NULLs. */ } else /* not NULL */ { def->length(cs->cset->lengthsp(cs, def->ptr(), def->length())); if (find_type2(interval, def->ptr(), def->length(), cs) == 0) /* not found */ { my_error(ER_INVALID_DEFAULT, MYF(0), sql_field->field_name); DBUG_RETURN(TRUE); } } } calculate_interval_lengths(cs, interval, &field_length, &dummy); sql_field->length= field_length; } set_if_smaller(sql_field->length, MAX_FIELD_WIDTH-1); } if (sql_field->sql_type == MYSQL_TYPE_BIT) { sql_field->pack_flag= FIELDFLAG_NUMBER; if (file->ha_table_flags() & HA_CAN_BIT_FIELD) total_uneven_bit_length+= sql_field->length & 7; else sql_field->pack_flag|= FIELDFLAG_TREAT_BIT_AS_CHAR; } sql_field->create_length_to_internal_length(); if (prepare_blob_field(thd, sql_field)) DBUG_RETURN(TRUE); if (!(sql_field->flags & NOT_NULL_FLAG)) null_fields++; if (check_column_name(sql_field->field_name)) { my_error(ER_WRONG_COLUMN_NAME, MYF(0), sql_field->field_name); DBUG_RETURN(TRUE); } /* Check if we have used the same field name before */ for (dup_no=0; (dup_field=it2++) != sql_field; dup_no++) { if (my_strcasecmp(system_charset_info, sql_field->field_name, dup_field->field_name) == 0) { /* If this was a CREATE ... SELECT statement, accept a field redefinition if we are changing a field in the SELECT part */ if (field_no < select_field_pos || dup_no >= select_field_pos) { my_error(ER_DUP_FIELDNAME, MYF(0), sql_field->field_name); DBUG_RETURN(TRUE); } else { /* Field redefined */ sql_field->def= dup_field->def; sql_field->sql_type= dup_field->sql_type; sql_field->charset= (dup_field->charset ? dup_field->charset : create_info->default_table_charset); sql_field->length= dup_field->char_length; sql_field->pack_length= dup_field->pack_length; sql_field->key_length= dup_field->key_length; sql_field->create_length_to_internal_length(); sql_field->decimals= dup_field->decimals; sql_field->unireg_check= dup_field->unireg_check; /* We're making one field from two, the result field will have dup_field->flags as flags. If we've incremented null_fields because of sql_field->flags, decrement it back. */ if (!(sql_field->flags & NOT_NULL_FLAG)) null_fields--; sql_field->flags= dup_field->flags; sql_field->interval= dup_field->interval; it2.remove(); // Remove first (create) definition select_field_pos--; break; } } } /* Don't pack rows in old tables if the user has requested this */ if ((sql_field->flags & BLOB_FLAG) || sql_field->sql_type == MYSQL_TYPE_VARCHAR && create_info->row_type != ROW_TYPE_FIXED) (*db_options)|= HA_OPTION_PACK_RECORD; it2.rewind(); } /* record_offset will be increased with 'length-of-null-bits' later */ record_offset= 0; null_fields+= total_uneven_bit_length; it.rewind(); while ((sql_field=it++)) { DBUG_ASSERT(sql_field->charset != 0); if (prepare_create_field(sql_field, &blob_columns, ×tamps, ×tamps_with_niladic, file->ha_table_flags())) DBUG_RETURN(TRUE); if (sql_field->sql_type == MYSQL_TYPE_VARCHAR) create_info->varchar= TRUE; sql_field->offset= record_offset; if (MTYP_TYPENR(sql_field->unireg_check) == Field::NEXT_NUMBER) auto_increment++; record_offset+= sql_field->pack_length; } if (timestamps_with_niladic > 1) { my_message(ER_TOO_MUCH_AUTO_TIMESTAMP_COLS, ER(ER_TOO_MUCH_AUTO_TIMESTAMP_COLS), MYF(0)); DBUG_RETURN(TRUE); } if (auto_increment > 1) { my_message(ER_WRONG_AUTO_KEY, ER(ER_WRONG_AUTO_KEY), MYF(0)); DBUG_RETURN(TRUE); } if (auto_increment && (file->ha_table_flags() & HA_NO_AUTO_INCREMENT)) { my_message(ER_TABLE_CANT_HANDLE_AUTO_INCREMENT, ER(ER_TABLE_CANT_HANDLE_AUTO_INCREMENT), MYF(0)); DBUG_RETURN(TRUE); } if (blob_columns && (file->ha_table_flags() & HA_NO_BLOBS)) { my_message(ER_TABLE_CANT_HANDLE_BLOB, ER(ER_TABLE_CANT_HANDLE_BLOB), MYF(0)); DBUG_RETURN(TRUE); } /* Create keys */ List_iterator<Key> key_iterator(alter_info->key_list); List_iterator<Key> key_iterator2(alter_info->key_list); uint key_parts=0, fk_key_count=0; bool primary_key=0,unique_key=0; Key *key, *key2; uint tmp, key_number; /* special marker for keys to be ignored */ static char ignore_key[1]; /* Calculate number of key segements */ *key_count= 0; while ((key=key_iterator++)) { DBUG_PRINT("info", ("key name: '%s' type: %d", key->name ? key->name : "(none)" , key->type)); LEX_STRING key_name_str; if (key->type == Key::FOREIGN_KEY) { fk_key_count++; Foreign_key *fk_key= (Foreign_key*) key; if (fk_key->ref_columns.elements && fk_key->ref_columns.elements != fk_key->columns.elements) { my_error(ER_WRONG_FK_DEF, MYF(0), (fk_key->name ? fk_key->name : "foreign key without name"), ER(ER_KEY_REF_DO_NOT_MATCH_TABLE_REF)); DBUG_RETURN(TRUE); } continue; } (*key_count)++; tmp=file->max_key_parts(); if (key->columns.elements > tmp) { my_error(ER_TOO_MANY_KEY_PARTS,MYF(0),tmp); DBUG_RETURN(TRUE); } key_name_str.str= (char*) key->name; key_name_str.length= key->name ? strlen(key->name) : 0; if (check_string_char_length(&key_name_str, "", NAME_CHAR_LEN, system_charset_info, 1)) { my_error(ER_TOO_LONG_IDENT, MYF(0), key->name); DBUG_RETURN(TRUE); } key_iterator2.rewind (); if (key->type != Key::FOREIGN_KEY) { while ((key2 = key_iterator2++) != key) { /* foreign_key_prefix(key, key2) returns 0 if key or key2, or both, is 'generated', and a generated key is a prefix of the other key. Then we do not need the generated shorter key. */ if ((key2->type != Key::FOREIGN_KEY && key2->name != ignore_key && !foreign_key_prefix(key, key2))) { /* TODO: issue warning message */ /* mark that the generated key should be ignored */ if (!key2->generated || (key->generated && key->columns.elements < key2->columns.elements)) key->name= ignore_key; else { key2->name= ignore_key; key_parts-= key2->columns.elements; (*key_count)--; } break; } } } if (key->name != ignore_key) key_parts+=key->columns.elements; else (*key_count)--; if (key->name && !tmp_table && (key->type != Key::PRIMARY) && !my_strcasecmp(system_charset_info,key->name,primary_key_name)) { my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0), key->name); DBUG_RETURN(TRUE); } } tmp=file->max_keys(); if (*key_count > tmp) { my_error(ER_TOO_MANY_KEYS,MYF(0),tmp); DBUG_RETURN(TRUE); } (*key_info_buffer)= key_info= (KEY*) sql_calloc(sizeof(KEY) * (*key_count)); key_part_info=(KEY_PART_INFO*) sql_calloc(sizeof(KEY_PART_INFO)*key_parts); if (!*key_info_buffer || ! key_part_info) DBUG_RETURN(TRUE); // Out of memory key_iterator.rewind(); key_number=0; for (; (key=key_iterator++) ; key_number++) { uint key_length=0; Key_part_spec *column; if (key->name == ignore_key) { /* ignore redundant keys */ do key=key_iterator++; while (key && key->name == ignore_key); if (!key) break; } switch (key->type) { case Key::MULTIPLE: key_info->flags= 0; break; case Key::FULLTEXT: key_info->flags= HA_FULLTEXT; if ((key_info->parser_name= &key->key_create_info.parser_name)->str) key_info->flags|= HA_USES_PARSER; else key_info->parser_name= 0; break; case Key::SPATIAL: #ifdef HAVE_SPATIAL key_info->flags= HA_SPATIAL; break; #else my_error(ER_FEATURE_DISABLED, MYF(0), sym_group_geom.name, sym_group_geom.needed_define); DBUG_RETURN(TRUE); #endif case Key::FOREIGN_KEY: key_number--; // Skip this key continue; default: key_info->flags = HA_NOSAME; break; } if (key->generated) key_info->flags|= HA_GENERATED_KEY; key_info->key_parts=(uint8) key->columns.elements; key_info->key_part=key_part_info; key_info->usable_key_parts= key_number; key_info->algorithm= key->key_create_info.algorithm; if (key->type == Key::FULLTEXT) { if (!(file->ha_table_flags() & HA_CAN_FULLTEXT)) { my_message(ER_TABLE_CANT_HANDLE_FT, ER(ER_TABLE_CANT_HANDLE_FT), MYF(0)); DBUG_RETURN(TRUE); } } /* Make SPATIAL to be RTREE by default SPATIAL only on BLOB or at least BINARY, this actually should be replaced by special GEOM type in near future when new frm file is ready checking for proper key parts number: */ /* TODO: Add proper checks if handler supports key_type and algorithm */ if (key_info->flags & HA_SPATIAL) { if (!(file->ha_table_flags() & HA_CAN_RTREEKEYS)) { my_message(ER_TABLE_CANT_HANDLE_SPKEYS, ER(ER_TABLE_CANT_HANDLE_SPKEYS), MYF(0)); DBUG_RETURN(TRUE); } if (key_info->key_parts != 1) { my_error(ER_WRONG_ARGUMENTS, MYF(0), "SPATIAL INDEX"); DBUG_RETURN(TRUE); } } else if (key_info->algorithm == HA_KEY_ALG_RTREE) { #ifdef HAVE_RTREE_KEYS if ((key_info->key_parts & 1) == 1) { my_error(ER_WRONG_ARGUMENTS, MYF(0), "RTREE INDEX"); DBUG_RETURN(TRUE); } /* TODO: To be deleted */ my_error(ER_NOT_SUPPORTED_YET, MYF(0), "RTREE INDEX"); DBUG_RETURN(TRUE); #else my_error(ER_FEATURE_DISABLED, MYF(0), sym_group_rtree.name, sym_group_rtree.needed_define); DBUG_RETURN(TRUE); #endif } /* Take block size from key part or table part */ /* TODO: Add warning if block size changes. We can't do it here, as this may depend on the size of the key */ key_info->block_size= (key->key_create_info.block_size ? key->key_create_info.block_size : create_info->key_block_size); if (key_info->block_size) key_info->flags|= HA_USES_BLOCK_SIZE; List_iterator<Key_part_spec> cols(key->columns), cols2(key->columns); CHARSET_INFO *ft_key_charset=0; // for FULLTEXT for (uint column_nr=0 ; (column=cols++) ; column_nr++) { uint length; Key_part_spec *dup_column; it.rewind(); field=0; while ((sql_field=it++) && my_strcasecmp(system_charset_info, column->field_name, sql_field->field_name)) field++; if (!sql_field) { my_error(ER_KEY_COLUMN_DOES_NOT_EXITS, MYF(0), column->field_name); DBUG_RETURN(TRUE); } while ((dup_column= cols2++) != column) { if (!my_strcasecmp(system_charset_info, column->field_name, dup_column->field_name)) { my_printf_error(ER_DUP_FIELDNAME, ER(ER_DUP_FIELDNAME),MYF(0), column->field_name); DBUG_RETURN(TRUE); } } cols2.rewind(); if (key->type == Key::FULLTEXT) { if ((sql_field->sql_type != MYSQL_TYPE_STRING && sql_field->sql_type != MYSQL_TYPE_VARCHAR && !f_is_blob(sql_field->pack_flag)) || sql_field->charset == &my_charset_bin || sql_field->charset->mbminlen > 1 || // ucs2 doesn't work yet (ft_key_charset && sql_field->charset != ft_key_charset)) { my_error(ER_BAD_FT_COLUMN, MYF(0), column->field_name); DBUG_RETURN(-1); } ft_key_charset=sql_field->charset; /* for fulltext keys keyseg length is 1 for blobs (it's ignored in ft code anyway, and 0 (set to column width later) for char's. it has to be correct col width for char's, as char data are not prefixed with length (unlike blobs, where ft code takes data length from a data prefix, ignoring column->length). */ column->length=test(f_is_blob(sql_field->pack_flag)); } else { column->length*= sql_field->charset->mbmaxlen; if (key->type == Key::SPATIAL && column->length) { my_error(ER_WRONG_SUB_KEY, MYF(0)); DBUG_RETURN(TRUE); } if (f_is_blob(sql_field->pack_flag) || (f_is_geom(sql_field->pack_flag) && key->type != Key::SPATIAL)) { if (!(file->ha_table_flags() & HA_CAN_INDEX_BLOBS)) { my_error(ER_BLOB_USED_AS_KEY, MYF(0), column->field_name); DBUG_RETURN(TRUE); } if (f_is_geom(sql_field->pack_flag) && sql_field->geom_type == Field::GEOM_POINT) column->length= 21; if (!column->length) { my_error(ER_BLOB_KEY_WITHOUT_LENGTH, MYF(0), column->field_name); DBUG_RETURN(TRUE); } } #ifdef HAVE_SPATIAL if (key->type == Key::SPATIAL) { if (!column->length) { /* 4 is: (Xmin,Xmax,Ymin,Ymax), this is for 2D case Lately we'll extend this code to support more dimensions */ column->length= 4*sizeof(double); } } #endif if (!(sql_field->flags & NOT_NULL_FLAG)) { if (key->type == Key::PRIMARY) { /* Implicitly set primary key fields to NOT NULL for ISO conf. */ sql_field->flags|= NOT_NULL_FLAG; sql_field->pack_flag&= ~FIELDFLAG_MAYBE_NULL; null_fields--; } else { key_info->flags|= HA_NULL_PART_KEY; if (!(file->ha_table_flags() & HA_NULL_IN_KEY)) { my_error(ER_NULL_COLUMN_IN_INDEX, MYF(0), column->field_name); DBUG_RETURN(TRUE); } if (key->type == Key::SPATIAL) { my_message(ER_SPATIAL_CANT_HAVE_NULL, ER(ER_SPATIAL_CANT_HAVE_NULL), MYF(0)); DBUG_RETURN(TRUE); } } } if (MTYP_TYPENR(sql_field->unireg_check) == Field::NEXT_NUMBER) { if (column_nr == 0 || (file->ha_table_flags() & HA_AUTO_PART_KEY)) auto_increment--; // Field is used } } key_part_info->fieldnr= field; key_part_info->offset= (uint16) sql_field->offset; key_part_info->key_type=sql_field->pack_flag; length= sql_field->key_length; if (column->length) { if (f_is_blob(sql_field->pack_flag)) { if ((length=column->length) > max_key_length || length > file->max_key_part_length()) { length=min(max_key_length, file->max_key_part_length()); if (key->type == Key::MULTIPLE) { /* not a critical problem */ char warn_buff[MYSQL_ERRMSG_SIZE]; my_snprintf(warn_buff, sizeof(warn_buff), ER(ER_TOO_LONG_KEY), length); push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_TOO_LONG_KEY, warn_buff); /* Align key length to multibyte char boundary */ length-= length % sql_field->charset->mbmaxlen; } else { my_error(ER_TOO_LONG_KEY,MYF(0),length); DBUG_RETURN(TRUE); } } } else if (!f_is_geom(sql_field->pack_flag) && (column->length > length || !Field::type_can_have_key_part (sql_field->sql_type) || ((f_is_packed(sql_field->pack_flag) || ((file->ha_table_flags() & HA_NO_PREFIX_CHAR_KEYS) && (key_info->flags & HA_NOSAME))) && column->length != length))) { my_message(ER_WRONG_SUB_KEY, ER(ER_WRONG_SUB_KEY), MYF(0)); DBUG_RETURN(TRUE); } else if (!(file->ha_table_flags() & HA_NO_PREFIX_CHAR_KEYS)) length=column->length; } else if (length == 0) { my_error(ER_WRONG_KEY_COLUMN, MYF(0), column->field_name); DBUG_RETURN(TRUE); } if (length > file->max_key_part_length() && key->type != Key::FULLTEXT) { length= file->max_key_part_length(); if (key->type == Key::MULTIPLE) { /* not a critical problem */ char warn_buff[MYSQL_ERRMSG_SIZE]; my_snprintf(warn_buff, sizeof(warn_buff), ER(ER_TOO_LONG_KEY), length); push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_TOO_LONG_KEY, warn_buff); /* Align key length to multibyte char boundary */ length-= length % sql_field->charset->mbmaxlen; } else { my_error(ER_TOO_LONG_KEY,MYF(0),length); DBUG_RETURN(TRUE); } } key_part_info->length=(uint16) length; /* Use packed keys for long strings on the first column */ if (!((*db_options) & HA_OPTION_NO_PACK_KEYS) && (length >= KEY_DEFAULT_PACK_LENGTH && (sql_field->sql_type == MYSQL_TYPE_STRING || sql_field->sql_type == MYSQL_TYPE_VARCHAR || sql_field->pack_flag & FIELDFLAG_BLOB))) { if (column_nr == 0 && (sql_field->pack_flag & FIELDFLAG_BLOB) || sql_field->sql_type == MYSQL_TYPE_VARCHAR) key_info->flags|= HA_BINARY_PACK_KEY | HA_VAR_LENGTH_KEY; else key_info->flags|= HA_PACK_KEY; } key_length+=length; key_part_info++; /* Create the key name based on the first column (if not given) */ if (column_nr == 0) { if (key->type == Key::PRIMARY) { if (primary_key) { my_message(ER_MULTIPLE_PRI_KEY, ER(ER_MULTIPLE_PRI_KEY), MYF(0)); DBUG_RETURN(TRUE); } key_name=primary_key_name; primary_key=1; } else if (!(key_name = key->name)) key_name=make_unique_key_name(sql_field->field_name, *key_info_buffer, key_info); if (check_if_keyname_exists(key_name, *key_info_buffer, key_info)) { my_error(ER_DUP_KEYNAME, MYF(0), key_name); DBUG_RETURN(TRUE); } key_info->name=(char*) key_name; } } if (!key_info->name || check_column_name(key_info->name)) { my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0), key_info->name); DBUG_RETURN(TRUE); } if (!(key_info->flags & HA_NULL_PART_KEY)) unique_key=1; key_info->key_length=(uint16) key_length; if (key_length > max_key_length && key->type != Key::FULLTEXT) { my_error(ER_TOO_LONG_KEY,MYF(0),max_key_length); DBUG_RETURN(TRUE); } key_info++; } if (!unique_key && !primary_key && (file->ha_table_flags() & HA_REQUIRE_PRIMARY_KEY)) { my_message(ER_REQUIRES_PRIMARY_KEY, ER(ER_REQUIRES_PRIMARY_KEY), MYF(0)); DBUG_RETURN(TRUE); } if (auto_increment > 0) { my_message(ER_WRONG_AUTO_KEY, ER(ER_WRONG_AUTO_KEY), MYF(0)); DBUG_RETURN(TRUE); } /* Sort keys in optimized order */ qsort((uchar*) *key_info_buffer, *key_count, sizeof(KEY), (qsort_cmp) sort_keys); create_info->null_bits= null_fields; DBUG_RETURN(FALSE); } /* Set table default charset, if not set SYNOPSIS set_table_default_charset() create_info Table create information DESCRIPTION If the table character set was not given explicitely, let's fetch the database default character set and apply it to the table. */ static void set_table_default_charset(THD *thd, HA_CREATE_INFO *create_info, char *db) { /* If the table character set was not given explicitly, let's fetch the database default character set and apply it to the table. */ if (!create_info->default_table_charset) { HA_CREATE_INFO db_info; load_db_opt_by_name(thd, db, &db_info); create_info->default_table_charset= db_info.default_table_charset; } } /* Extend long VARCHAR fields to blob & prepare field if it's a blob SYNOPSIS prepare_blob_field() sql_field Field to check RETURN 0 ok 1 Error (sql_field can't be converted to blob) In this case the error is given */ static bool prepare_blob_field(THD *thd, Create_field *sql_field) { DBUG_ENTER("prepare_blob_field"); if (sql_field->length > MAX_FIELD_VARCHARLENGTH && !(sql_field->flags & BLOB_FLAG)) { /* Convert long VARCHAR columns to TEXT or BLOB */ char warn_buff[MYSQL_ERRMSG_SIZE]; if (sql_field->def || (thd->variables.sql_mode & (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES))) { my_error(ER_TOO_BIG_FIELDLENGTH, MYF(0), sql_field->field_name, MAX_FIELD_VARCHARLENGTH / sql_field->charset->mbmaxlen); DBUG_RETURN(1); } sql_field->sql_type= MYSQL_TYPE_BLOB; sql_field->flags|= BLOB_FLAG; sprintf(warn_buff, ER(ER_AUTO_CONVERT), sql_field->field_name, (sql_field->charset == &my_charset_bin) ? "VARBINARY" : "VARCHAR", (sql_field->charset == &my_charset_bin) ? "BLOB" : "TEXT"); push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_AUTO_CONVERT, warn_buff); } if ((sql_field->flags & BLOB_FLAG) && sql_field->length) { if (sql_field->sql_type == MYSQL_TYPE_BLOB) { /* The user has given a length to the blob column */ sql_field->sql_type= get_blob_type_from_length(sql_field->length); sql_field->pack_length= calc_pack_length(sql_field->sql_type, 0); } sql_field->length= 0; } DBUG_RETURN(0); } /* Preparation of Create_field for SP function return values. Based on code used in the inner loop of mysql_prepare_create_table() above. SYNOPSIS sp_prepare_create_field() thd Thread object sql_field Field to prepare DESCRIPTION Prepares the field structures for field creation. */ void sp_prepare_create_field(THD *thd, Create_field *sql_field) { if (sql_field->sql_type == MYSQL_TYPE_SET || sql_field->sql_type == MYSQL_TYPE_ENUM) { uint32 field_length, dummy; if (sql_field->sql_type == MYSQL_TYPE_SET) { calculate_interval_lengths(sql_field->charset, sql_field->interval, &dummy, &field_length); sql_field->length= field_length + (sql_field->interval->count - 1); } else /* MYSQL_TYPE_ENUM */ { calculate_interval_lengths(sql_field->charset, sql_field->interval, &field_length, &dummy); sql_field->length= field_length; } set_if_smaller(sql_field->length, MAX_FIELD_WIDTH-1); } if (sql_field->sql_type == MYSQL_TYPE_BIT) { sql_field->pack_flag= FIELDFLAG_NUMBER | FIELDFLAG_TREAT_BIT_AS_CHAR; } sql_field->create_length_to_internal_length(); DBUG_ASSERT(sql_field->def == 0); /* Can't go wrong as sql_field->def is not defined */ (void) prepare_blob_field(thd, sql_field); } /* Create a table SYNOPSIS mysql_create_table_no_lock() thd Thread object db Database table_name Table name create_info Create information (like MAX_ROWS) fields List of fields to create keys List of keys to create internal_tmp_table Set to 1 if this is an internal temporary table (From ALTER TABLE) select_field_count DESCRIPTION If one creates a temporary table, this is automatically opened Note that this function assumes that caller already have taken name-lock on table being created or used some other way to ensure that concurrent operations won't intervene. mysql_create_table() is a wrapper that can be used for this. no_log is needed for the case of CREATE ... SELECT, as the logging will be done later in sql_insert.cc select_field_count is also used for CREATE ... SELECT, and must be zero for standard create of table. RETURN VALUES FALSE OK TRUE error */ bool mysql_create_table_no_lock(THD *thd, const char *db, const char *table_name, HA_CREATE_INFO *create_info, Alter_info *alter_info, bool internal_tmp_table, uint select_field_count) { char path[FN_REFLEN]; uint path_length; const char *alias; uint db_options, key_count; KEY *key_info_buffer; handler *file; bool error= TRUE; DBUG_ENTER("mysql_create_table_no_lock"); DBUG_PRINT("enter", ("db: '%s' table: '%s' tmp: %d", db, table_name, internal_tmp_table)); /* Check for duplicate fields and check type of table to create */ if (!alter_info->create_list.elements) { my_message(ER_TABLE_MUST_HAVE_COLUMNS, ER(ER_TABLE_MUST_HAVE_COLUMNS), MYF(0)); DBUG_RETURN(TRUE); } if (check_engine(thd, table_name, create_info)) DBUG_RETURN(TRUE); db_options= create_info->table_options; if (create_info->row_type != ROW_TYPE_FIXED && create_info->row_type != ROW_TYPE_DEFAULT) db_options|= HA_OPTION_PACK_RECORD; alias= table_case_name(create_info, table_name); if (!(file= get_new_handler((TABLE_SHARE*) 0, thd->mem_root, create_info->db_type))) { mem_alloc_error(sizeof(handler)); DBUG_RETURN(TRUE); } #ifdef WITH_PARTITION_STORAGE_ENGINE partition_info *part_info= thd->work_part_info; if (!part_info && create_info->db_type->partition_flags && (create_info->db_type->partition_flags() & HA_USE_AUTO_PARTITION)) { /* Table is not defined as a partitioned table but the engine handles all tables as partitioned. The handler will set up the partition info object with the default settings. */ thd->work_part_info= part_info= new partition_info(); if (!part_info) { mem_alloc_error(sizeof(partition_info)); DBUG_RETURN(TRUE); } file->set_auto_partitions(part_info); part_info->default_engine_type= create_info->db_type; part_info->is_auto_partitioned= TRUE; } if (part_info) { /* The table has been specified as a partitioned table. If this is part of an ALTER TABLE the handler will be the partition handler but we need to specify the default handler to use for partitions also in the call to check_partition_info. We transport this information in the default_db_type variable, it is either DB_TYPE_DEFAULT or the engine set in the ALTER TABLE command. Check that we don't use foreign keys in the table since it won't work even with InnoDB beneath it. */ List_iterator<Key> key_iterator(alter_info->key_list); Key *key; handlerton *part_engine_type= create_info->db_type; char *part_syntax_buf; uint syntax_len; handlerton *engine_type; if (create_info->options & HA_LEX_CREATE_TMP_TABLE) { my_error(ER_PARTITION_NO_TEMPORARY, MYF(0)); goto err; } while ((key= key_iterator++)) { if (key->type == Key::FOREIGN_KEY && !part_info->is_auto_partitioned) { my_error(ER_CANNOT_ADD_FOREIGN, MYF(0)); goto err; } } if ((part_engine_type == partition_hton) && part_info->default_engine_type) { /* This only happens at ALTER TABLE. default_engine_type was assigned from the engine set in the ALTER TABLE command. */ ; } else { if (create_info->used_fields & HA_CREATE_USED_ENGINE) { part_info->default_engine_type= create_info->db_type; } else { if (part_info->default_engine_type == NULL) { part_info->default_engine_type= ha_checktype(thd, DB_TYPE_DEFAULT, 0, 0); } } } DBUG_PRINT("info", ("db_type = %d", ha_legacy_type(part_info->default_engine_type))); if (part_info->check_partition_info(thd, &engine_type, file, create_info, TRUE)) goto err; part_info->default_engine_type= engine_type; /* We reverse the partitioning parser and generate a standard format for syntax stored in frm file. */ if (!(part_syntax_buf= generate_partition_syntax(part_info, &syntax_len, TRUE, TRUE))) goto err; part_info->part_info_string= part_syntax_buf; part_info->part_info_len= syntax_len; if ((!(engine_type->partition_flags && engine_type->partition_flags() & HA_CAN_PARTITION)) || create_info->db_type == partition_hton) { /* The handler assigned to the table cannot handle partitioning. Assign the partition handler as the handler of the table. */ DBUG_PRINT("info", ("db_type: %d", ha_legacy_type(create_info->db_type))); delete file; create_info->db_type= partition_hton; if (!(file= get_ha_partition(part_info))) { DBUG_RETURN(TRUE); } /* If we have default number of partitions or subpartitions we might require to set-up the part_info object such that it creates a proper .par file. The current part_info object is only used to create the frm-file and .par-file. */ if (part_info->use_default_no_partitions && part_info->no_parts && (int)part_info->no_parts != file->get_default_no_partitions(create_info)) { uint i; List_iterator<partition_element> part_it(part_info->partitions); part_it++; DBUG_ASSERT(thd->lex->sql_command != SQLCOM_CREATE_TABLE); for (i= 1; i < part_info->partitions.elements; i++) (part_it++)->part_state= PART_TO_BE_DROPPED; } else if (part_info->is_sub_partitioned() && part_info->use_default_no_subpartitions && part_info->no_subparts && (int)part_info->no_subparts != file->get_default_no_partitions(create_info)) { DBUG_ASSERT(thd->lex->sql_command != SQLCOM_CREATE_TABLE); part_info->no_subparts= file->get_default_no_partitions(create_info); } } else if (create_info->db_type != engine_type) { /* We come here when we don't use a partitioned handler. Since we use a partitioned table it must be "native partitioned". We have switched engine from defaults, most likely only specified engines in partition clauses. */ delete file; if (!(file= get_new_handler((TABLE_SHARE*) 0, thd->mem_root, engine_type))) { mem_alloc_error(sizeof(handler)); DBUG_RETURN(TRUE); } } } #endif set_table_default_charset(thd, create_info, (char*) db); if (mysql_prepare_create_table(thd, create_info, alter_info, internal_tmp_table, &db_options, file, &key_info_buffer, &key_count, select_field_count)) goto err; /* Check if table exists */ if (create_info->options & HA_LEX_CREATE_TMP_TABLE) { path_length= build_tmptable_filename(thd, path, sizeof(path)); create_info->table_options|=HA_CREATE_DELAY_KEY_WRITE; } else { #ifdef FN_DEVCHAR /* check if the table name contains FN_DEVCHAR when defined */ if (strchr(alias, FN_DEVCHAR)) { my_error(ER_WRONG_TABLE_NAME, MYF(0), alias); DBUG_RETURN(TRUE); } #endif path_length= build_table_filename(path, sizeof(path), db, alias, reg_ext, internal_tmp_table ? FN_IS_TMP : 0); } /* Check if table already exists */ if ((create_info->options & HA_LEX_CREATE_TMP_TABLE) && find_temporary_table(thd, db, table_name)) { if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS) { create_info->table_existed= 1; // Mark that table existed push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_TABLE_EXISTS_ERROR, ER(ER_TABLE_EXISTS_ERROR), alias); error= 0; goto err; } my_error(ER_TABLE_EXISTS_ERROR, MYF(0), alias); goto err; } VOID(pthread_mutex_lock(&LOCK_open)); if (!internal_tmp_table && !(create_info->options & HA_LEX_CREATE_TMP_TABLE)) { if (!access(path,F_OK)) { if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS) goto warn; my_error(ER_TABLE_EXISTS_ERROR,MYF(0),table_name); goto unlock_and_end; } /* We don't assert here, but check the result, because the table could be in the table definition cache and in the same time the .frm could be missing from the disk, in case of manual intervention which deletes the .frm file. The user has to use FLUSH TABLES; to clear the cache. Then she could create the table. This case is pretty obscure and therefore we don't introduce a new error message only for it. */ if (get_cached_table_share(db, alias)) { my_error(ER_TABLE_EXISTS_ERROR, MYF(0), table_name); goto unlock_and_end; } } /* Check that table with given name does not already exist in any storage engine. In such a case it should be discovered and the error ER_TABLE_EXISTS_ERROR be returned unless user specified CREATE TABLE IF EXISTS The LOCK_open mutex has been locked to make sure no one else is attempting to discover the table. Since it's not on disk as a frm file, no one could be using it! */ if (!(create_info->options & HA_LEX_CREATE_TMP_TABLE)) { bool create_if_not_exists = create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS; int retcode = ha_table_exists_in_engine(thd, db, table_name); DBUG_PRINT("info", ("exists_in_engine: %u",retcode)); switch (retcode) { case HA_ERR_NO_SUCH_TABLE: /* Normal case, no table exists. we can go and create it */ break; case HA_ERR_TABLE_EXIST: DBUG_PRINT("info", ("Table existed in handler")); if (create_if_not_exists) goto warn; my_error(ER_TABLE_EXISTS_ERROR,MYF(0),table_name); goto unlock_and_end; break; default: DBUG_PRINT("info", ("error: %u from storage engine", retcode)); my_error(retcode, MYF(0),table_name); goto unlock_and_end; } } thd->proc_info="creating table"; create_info->table_existed= 0; // Mark that table is created if (thd->variables.sql_mode & MODE_NO_DIR_IN_CREATE) create_info->data_file_name= create_info->index_file_name= 0; create_info->table_options=db_options; path[path_length - reg_ext_length]= '\0'; // Remove .frm extension if (rea_create_table(thd, path, db, table_name, create_info, alter_info->create_list, key_count, key_info_buffer, file)) goto unlock_and_end; if (create_info->options & HA_LEX_CREATE_TMP_TABLE) { /* Open table and put in temporary table list */ if (!(open_temporary_table(thd, path, db, table_name, 1))) { (void) rm_temporary_table(create_info->db_type, path); goto unlock_and_end; } thd->thread_specific_used= TRUE; } /* Don't write statement if: - It is an internal temporary table, - Row-based logging is used and it we are creating a temporary table, or - The binary log is not open. Otherwise, the statement shall be binlogged. */ if (!internal_tmp_table && (!thd->current_stmt_binlog_row_based || (thd->current_stmt_binlog_row_based && !(create_info->options & HA_LEX_CREATE_TMP_TABLE)))) write_bin_log(thd, TRUE, thd->query, thd->query_length); error= FALSE; unlock_and_end: VOID(pthread_mutex_unlock(&LOCK_open)); err: thd->proc_info="After create"; delete file; DBUG_RETURN(error); warn: error= FALSE; push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_TABLE_EXISTS_ERROR, ER(ER_TABLE_EXISTS_ERROR), alias); create_info->table_existed= 1; // Mark that table existed goto unlock_and_end; } /* Database and name-locking aware wrapper for mysql_create_table_no_lock(), */ bool mysql_create_table(THD *thd, const char *db, const char *table_name, HA_CREATE_INFO *create_info, Alter_info *alter_info, bool internal_tmp_table, uint select_field_count) { TABLE *name_lock= 0; bool result; DBUG_ENTER("mysql_create_table"); /* Wait for any database locks */ pthread_mutex_lock(&LOCK_lock_db); while (!thd->killed && hash_search(&lock_db_cache,(uchar*) db, strlen(db))) { wait_for_condition(thd, &LOCK_lock_db, &COND_refresh); pthread_mutex_lock(&LOCK_lock_db); } if (thd->killed) { pthread_mutex_unlock(&LOCK_lock_db); DBUG_RETURN(TRUE); } creating_table++; pthread_mutex_unlock(&LOCK_lock_db); if (!(create_info->options & HA_LEX_CREATE_TMP_TABLE)) { if (lock_table_name_if_not_cached(thd, db, table_name, &name_lock)) { result= TRUE; goto unlock; } if (!name_lock) { if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS) { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_TABLE_EXISTS_ERROR, ER(ER_TABLE_EXISTS_ERROR), table_name); create_info->table_existed= 1; result= FALSE; } else { my_error(ER_TABLE_EXISTS_ERROR,MYF(0),table_name); result= TRUE; } goto unlock; } } result= mysql_create_table_no_lock(thd, db, table_name, create_info, alter_info, internal_tmp_table, select_field_count); unlock: if (name_lock) { pthread_mutex_lock(&LOCK_open); unlink_open_table(thd, name_lock, FALSE); pthread_mutex_unlock(&LOCK_open); } pthread_mutex_lock(&LOCK_lock_db); if (!--creating_table && creating_database) pthread_cond_signal(&COND_refresh); pthread_mutex_unlock(&LOCK_lock_db); DBUG_RETURN(result); } /* ** Give the key name after the first field with an optional '_#' after **/ static bool check_if_keyname_exists(const char *name, KEY *start, KEY *end) { for (KEY *key=start ; key != end ; key++) if (!my_strcasecmp(system_charset_info,name,key->name)) return 1; return 0; } static char * make_unique_key_name(const char *field_name,KEY *start,KEY *end) { char buff[MAX_FIELD_NAME],*buff_end; if (!check_if_keyname_exists(field_name,start,end) && my_strcasecmp(system_charset_info,field_name,primary_key_name)) return (char*) field_name; // Use fieldname buff_end=strmake(buff,field_name, sizeof(buff)-4); /* Only 3 chars + '\0' left, so need to limit to 2 digit This is ok as we can't have more than 100 keys anyway */ for (uint i=2 ; i< 100; i++) { *buff_end= '_'; int10_to_str(i, buff_end+1, 10); if (!check_if_keyname_exists(buff,start,end)) return sql_strdup(buff); } return (char*) "not_specified"; // Should never happen } /**************************************************************************** ** Alter a table definition ****************************************************************************/ /* Rename a table. SYNOPSIS mysql_rename_table() base The handlerton handle. old_db The old database name. old_name The old table name. new_db The new database name. new_name The new table name. flags flags for build_table_filename(). FN_FROM_IS_TMP old_name is temporary. FN_TO_IS_TMP new_name is temporary. NO_FRM_RENAME Don't rename the FRM file but only the table in the storage engine. RETURN FALSE OK TRUE Error */ bool mysql_rename_table(handlerton *base, const char *old_db, const char *old_name, const char *new_db, const char *new_name, uint flags) { THD *thd= current_thd; char from[FN_REFLEN], to[FN_REFLEN], lc_from[FN_REFLEN], lc_to[FN_REFLEN]; char *from_base= from, *to_base= to; char tmp_name[NAME_LEN+1]; handler *file; int error=0; DBUG_ENTER("mysql_rename_table"); DBUG_PRINT("enter", ("old: '%s'.'%s' new: '%s'.'%s'", old_db, old_name, new_db, new_name)); file= (base == NULL ? 0 : get_new_handler((TABLE_SHARE*) 0, thd->mem_root, base)); build_table_filename(from, sizeof(from), old_db, old_name, "", flags & FN_FROM_IS_TMP); build_table_filename(to, sizeof(to), new_db, new_name, "", flags & FN_TO_IS_TMP); /* If lower_case_table_names == 2 (case-preserving but case-insensitive file system) and the storage is not HA_FILE_BASED, we need to provide a lowercase file name, but we leave the .frm in mixed case. */ if (lower_case_table_names == 2 && file && !(file->ha_table_flags() & HA_FILE_BASED)) { strmov(tmp_name, old_name); my_casedn_str(files_charset_info, tmp_name); build_table_filename(lc_from, sizeof(lc_from), old_db, tmp_name, "", flags & FN_FROM_IS_TMP); from_base= lc_from; strmov(tmp_name, new_name); my_casedn_str(files_charset_info, tmp_name); build_table_filename(lc_to, sizeof(lc_to), new_db, tmp_name, "", flags & FN_TO_IS_TMP); to_base= lc_to; } if (!file || !(error=file->rename_table(from_base, to_base))) { if (!(flags & NO_FRM_RENAME) && rename_file_ext(from,to,reg_ext)) { error=my_errno; /* Restore old file name */ if (file) file->rename_table(to_base, from_base); } } delete file; if (error == HA_ERR_WRONG_COMMAND) my_error(ER_NOT_SUPPORTED_YET, MYF(0), "ALTER TABLE"); else if (error) my_error(ER_ERROR_ON_RENAME, MYF(0), from, to, error); DBUG_RETURN(error != 0); } /* Force all other threads to stop using the table SYNOPSIS wait_while_table_is_used() thd Thread handler table Table to remove from cache function HA_EXTRA_PREPARE_FOR_DROP if table is to be deleted HA_EXTRA_FORCE_REOPEN if table is not be used HA_EXTRA_PREPARE_FOR_REANME if table is to be renamed NOTES When returning, the table will be unusable for other threads until the table is closed. PREREQUISITES Lock on LOCK_open Win32 clients must also have a WRITE LOCK on the table ! */ static void wait_while_table_is_used(THD *thd,TABLE *table, enum ha_extra_function function) { DBUG_ENTER("wait_while_table_is_used"); DBUG_PRINT("enter", ("table: '%s' share: 0x%lx db_stat: %u version: %lu", table->s->table_name.str, (ulong) table->s, table->db_stat, table->s->version)); /* Mark all tables that are in use as 'old' */ mysql_lock_abort(thd, table, TRUE); /* end threads waiting on lock */ /* Wait until all there are no other threads that has this table open */ remove_table_from_cache(thd, table->s->db.str, table->s->table_name.str, RTFC_WAIT_OTHER_THREAD_FLAG); /* extra() call must come only after all instances above are closed */ VOID(table->file->extra(function)); DBUG_VOID_RETURN; } /* Close a cached table SYNOPSIS close_cached_table() thd Thread handler table Table to remove from cache NOTES Function ends by signaling threads waiting for the table to try to reopen the table. PREREQUISITES Lock on LOCK_open Win32 clients must also have a WRITE LOCK on the table ! */ void close_cached_table(THD *thd, TABLE *table) { DBUG_ENTER("close_cached_table"); wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN); /* Close lock if this is not got with LOCK TABLES */ if (thd->lock) { mysql_unlock_tables(thd, thd->lock); thd->lock=0; // Start locked threads } /* Close all copies of 'table'. This also frees all LOCK TABLES lock */ unlink_open_table(thd, table, TRUE); /* When lock on LOCK_open is freed other threads can continue */ broadcast_refresh(); DBUG_VOID_RETURN; } static int send_check_errmsg(THD *thd, TABLE_LIST* table, const char* operator_name, const char* errmsg) { Protocol *protocol= thd->protocol; protocol->prepare_for_resend(); protocol->store(table->alias, system_charset_info); protocol->store((char*) operator_name, system_charset_info); protocol->store(STRING_WITH_LEN("error"), system_charset_info); protocol->store(errmsg, system_charset_info); thd->clear_error(); if (protocol->write()) return -1; return 1; } static int prepare_for_restore(THD* thd, TABLE_LIST* table, HA_CHECK_OPT *check_opt) { DBUG_ENTER("prepare_for_restore"); if (table->table) // do not overwrite existing tables on restore { DBUG_RETURN(send_check_errmsg(thd, table, "restore", "table exists, will not overwrite on restore" )); } else { char* backup_dir= thd->lex->backup_dir; char src_path[FN_REFLEN], dst_path[FN_REFLEN], uname[FN_REFLEN]; char* table_name= table->table_name; char* db= table->db; VOID(tablename_to_filename(table->table_name, uname, sizeof(uname))); if (fn_format_relative_to_data_home(src_path, uname, backup_dir, reg_ext)) DBUG_RETURN(-1); // protect buffer overflow build_table_filename(dst_path, sizeof(dst_path), db, table_name, reg_ext, 0); if (lock_and_wait_for_table_name(thd,table)) DBUG_RETURN(-1); if (my_copy(src_path, dst_path, MYF(MY_WME))) { pthread_mutex_lock(&LOCK_open); unlock_table_name(thd, table); pthread_mutex_unlock(&LOCK_open); DBUG_RETURN(send_check_errmsg(thd, table, "restore", "Failed copying .frm file")); } if (mysql_truncate(thd, table, 1)) { pthread_mutex_lock(&LOCK_open); unlock_table_name(thd, table); pthread_mutex_unlock(&LOCK_open); DBUG_RETURN(send_check_errmsg(thd, table, "restore", "Failed generating table from .frm file")); } } /* Now we should be able to open the partially restored table to finish the restore in the handler later on */ pthread_mutex_lock(&LOCK_open); if (reopen_name_locked_table(thd, table, TRUE)) { unlock_table_name(thd, table); pthread_mutex_unlock(&LOCK_open); DBUG_RETURN(send_check_errmsg(thd, table, "restore", "Failed to open partially restored table")); } pthread_mutex_unlock(&LOCK_open); DBUG_RETURN(0); } static int prepare_for_repair(THD *thd, TABLE_LIST *table_list, HA_CHECK_OPT *check_opt) { int error= 0; TABLE tmp_table, *table; TABLE_SHARE *share; char from[FN_REFLEN],tmp[FN_REFLEN+32]; const char **ext; MY_STAT stat_info; DBUG_ENTER("prepare_for_repair"); if (!(check_opt->sql_flags & TT_USEFRM)) DBUG_RETURN(0); if (!(table= table_list->table)) /* if open_ltable failed */ { char key[MAX_DBKEY_LENGTH]; uint key_length; key_length= create_table_def_key(thd, key, table_list, 0); pthread_mutex_lock(&LOCK_open); if (!(share= (get_table_share(thd, table_list, key, key_length, 0, &error)))) { pthread_mutex_unlock(&LOCK_open); DBUG_RETURN(0); // Can't open frm file } if (open_table_from_share(thd, share, "", 0, 0, 0, &tmp_table, FALSE)) { release_table_share(share, RELEASE_NORMAL); pthread_mutex_unlock(&LOCK_open); DBUG_RETURN(0); // Out of memory } table= &tmp_table; pthread_mutex_unlock(&LOCK_open); } /* REPAIR TABLE ... USE_FRM for temporary tables makes little sense. */ if (table->s->tmp_table) { error= send_check_errmsg(thd, table_list, "repair", "Cannot repair temporary table from .frm file"); goto end; } /* User gave us USE_FRM which means that the header in the index file is trashed. In this case we will try to fix the table the following way: - Rename the data file to a temporary name - Truncate the table - Replace the new data file with the old one - Run a normal repair using the new index file and the old data file */ /* Check if this is a table type that stores index and data separately, like ISAM or MyISAM. We assume fixed order of engine file name extentions array. First element of engine file name extentions array is meta/index file extention. Second element - data file extention. */ ext= table->file->bas_ext(); if (!ext[0] || !ext[1]) goto end; // No data file // Name of data file strxmov(from, table->s->normalized_path.str, ext[1], NullS); if (!my_stat(from, &stat_info, MYF(0))) goto end; // Can't use USE_FRM flag my_snprintf(tmp, sizeof(tmp), "%s-%lx_%lx", from, current_pid, thd->thread_id); /* If we could open the table, close it */ if (table_list->table) { pthread_mutex_lock(&LOCK_open); close_cached_table(thd, table); pthread_mutex_unlock(&LOCK_open); } if (lock_and_wait_for_table_name(thd,table_list)) { error= -1; goto end; } if (my_rename(from, tmp, MYF(MY_WME))) { pthread_mutex_lock(&LOCK_open); unlock_table_name(thd, table_list); pthread_mutex_unlock(&LOCK_open); error= send_check_errmsg(thd, table_list, "repair", "Failed renaming data file"); goto end; } if (mysql_truncate(thd, table_list, 1)) { pthread_mutex_lock(&LOCK_open); unlock_table_name(thd, table_list); pthread_mutex_unlock(&LOCK_open); error= send_check_errmsg(thd, table_list, "repair", "Failed generating table from .frm file"); goto end; } if (my_rename(tmp, from, MYF(MY_WME))) { pthread_mutex_lock(&LOCK_open); unlock_table_name(thd, table_list); pthread_mutex_unlock(&LOCK_open); error= send_check_errmsg(thd, table_list, "repair", "Failed restoring .MYD file"); goto end; } /* Now we should be able to open the partially repaired table to finish the repair in the handler later on. */ pthread_mutex_lock(&LOCK_open); if (reopen_name_locked_table(thd, table_list, TRUE)) { unlock_table_name(thd, table_list); pthread_mutex_unlock(&LOCK_open); error= send_check_errmsg(thd, table_list, "repair", "Failed to open partially repaired table"); goto end; } pthread_mutex_unlock(&LOCK_open); end: if (table == &tmp_table) { pthread_mutex_lock(&LOCK_open); closefrm(table, 1); // Free allocated memory pthread_mutex_unlock(&LOCK_open); } DBUG_RETURN(error); } /* RETURN VALUES FALSE Message sent to net (admin operation went ok) TRUE Message should be sent by caller (admin operation or network communication failed) */ static bool mysql_admin_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt, const char *operator_name, thr_lock_type lock_type, bool open_for_modify, bool no_warnings_for_error, uint extra_open_options, int (*prepare_func)(THD *, TABLE_LIST *, HA_CHECK_OPT *), int (handler::*operator_func)(THD *, HA_CHECK_OPT *), int (view_operator_func)(THD *, TABLE_LIST*)) { TABLE_LIST *table; SELECT_LEX *select= &thd->lex->select_lex; List<Item> field_list; Item *item; Protocol *protocol= thd->protocol; LEX *lex= thd->lex; int result_code; DBUG_ENTER("mysql_admin_table"); if (end_active_trans(thd)) DBUG_RETURN(1); field_list.push_back(item = new Item_empty_string("Table", NAME_CHAR_LEN*2)); item->maybe_null = 1; field_list.push_back(item = new Item_empty_string("Op", 10)); item->maybe_null = 1; field_list.push_back(item = new Item_empty_string("Msg_type", 10)); item->maybe_null = 1; field_list.push_back(item = new Item_empty_string("Msg_text", 255)); item->maybe_null = 1; if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF)) DBUG_RETURN(TRUE); mysql_ha_flush(thd, tables, MYSQL_HA_CLOSE_FINAL, FALSE); for (table= tables; table; table= table->next_local) { char table_name[NAME_LEN*2+2]; char* db = table->db; bool fatal_error=0; strxmov(table_name, db, ".", table->table_name, NullS); thd->open_options|= extra_open_options; table->lock_type= lock_type; /* open only one table from local list of command */ { TABLE_LIST *save_next_global, *save_next_local; save_next_global= table->next_global; table->next_global= 0; save_next_local= table->next_local; table->next_local= 0; select->table_list.first= (uchar*)table; /* Time zone tables and SP tables can be add to lex->query_tables list, so it have to be prepared. TODO: Investigate if we can put extra tables into argument instead of using lex->query_tables */ lex->query_tables= table; lex->query_tables_last= &table->next_global; lex->query_tables_own_last= 0; thd->no_warnings_for_error= no_warnings_for_error; if (view_operator_func == NULL) table->required_type=FRMTYPE_TABLE; open_and_lock_tables(thd, table); thd->no_warnings_for_error= 0; table->next_global= save_next_global; table->next_local= save_next_local; thd->open_options&= ~extra_open_options; } if (prepare_func) { switch ((*prepare_func)(thd, table, check_opt)) { case 1: // error, message written to net ha_autocommit_or_rollback(thd, 1); close_thread_tables(thd); continue; case -1: // error, message could be written to net goto err; default: // should be 0 otherwise ; } } /* CHECK TABLE command is only command where VIEW allowed here and this command use only temporary teble method for VIEWs resolving => there can't be VIEW tree substitition of join view => if opening table succeed then table->table will have real TABLE pointer as value (in case of join view substitution table->table can be 0, but here it is impossible) */ if (!table->table) { if (!thd->warn_list.elements) push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, ER_CHECK_NO_SUCH_TABLE, ER(ER_CHECK_NO_SUCH_TABLE)); /* if it was a view will check md5 sum */ if (table->view && view_checksum(thd, table) == HA_ADMIN_WRONG_CHECKSUM) push_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, ER_VIEW_CHECKSUM, ER(ER_VIEW_CHECKSUM)); result_code= HA_ADMIN_CORRUPT; goto send_result; } if (table->view) { result_code= (*view_operator_func)(thd, table); goto send_result; } if ((table->table->db_stat & HA_READ_ONLY) && open_for_modify) { char buff[FN_REFLEN + MYSQL_ERRMSG_SIZE]; uint length; protocol->prepare_for_resend(); protocol->store(table_name, system_charset_info); protocol->store(operator_name, system_charset_info); protocol->store(STRING_WITH_LEN("error"), system_charset_info); length= my_snprintf(buff, sizeof(buff), ER(ER_OPEN_AS_READONLY), table_name); protocol->store(buff, length, system_charset_info); ha_autocommit_or_rollback(thd, 0); close_thread_tables(thd); lex->reset_query_tables_list(FALSE); table->table=0; // For query cache if (protocol->write()) goto err; continue; } /* Close all instances of the table to allow repair to rename files */ if (lock_type == TL_WRITE && table->table->s->version) { pthread_mutex_lock(&LOCK_open); const char *old_message=thd->enter_cond(&COND_refresh, &LOCK_open, "Waiting to get writelock"); mysql_lock_abort(thd,table->table, TRUE); remove_table_from_cache(thd, table->table->s->db.str, table->table->s->table_name.str, RTFC_WAIT_OTHER_THREAD_FLAG | RTFC_CHECK_KILLED_FLAG); thd->exit_cond(old_message); DBUG_EXECUTE_IF("wait_in_mysql_admin_table", wait_for_kill_signal(thd);); if (thd->killed) goto err; /* Flush entries in the query cache involving this table. */ query_cache_invalidate3(thd, table->table, 0); open_for_modify= 0; } if (table->table->s->crashed && operator_func == &handler::ha_check) { protocol->prepare_for_resend(); protocol->store(table_name, system_charset_info); protocol->store(operator_name, system_charset_info); protocol->store(STRING_WITH_LEN("warning"), system_charset_info); protocol->store(STRING_WITH_LEN("Table is marked as crashed"), system_charset_info); if (protocol->write()) goto err; } if (operator_func == &handler::ha_repair && !(check_opt->sql_flags & TT_USEFRM)) { if ((table->table->file->check_old_types() == HA_ADMIN_NEEDS_ALTER) || (table->table->file->ha_check_for_upgrade(check_opt) == HA_ADMIN_NEEDS_ALTER)) { my_bool save_no_send_ok= thd->net.no_send_ok; ha_autocommit_or_rollback(thd, 1); close_thread_tables(thd); tmp_disable_binlog(thd); // binlogging is done by caller if wanted thd->net.no_send_ok= TRUE; result_code= mysql_recreate_table(thd, table); thd->net.no_send_ok= save_no_send_ok; reenable_binlog(thd); goto send_result; } } result_code = (table->table->file->*operator_func)(thd, check_opt); send_result: lex->cleanup_after_one_table_open(); thd->clear_error(); // these errors shouldn't get client { List_iterator_fast<MYSQL_ERROR> it(thd->warn_list); MYSQL_ERROR *err; while ((err= it++)) { protocol->prepare_for_resend(); protocol->store(table_name, system_charset_info); protocol->store((char*) operator_name, system_charset_info); protocol->store(warning_level_names[err->level].str, warning_level_names[err->level].length, system_charset_info); protocol->store(err->msg, system_charset_info); if (protocol->write()) goto err; } mysql_reset_errors(thd, true); } protocol->prepare_for_resend(); protocol->store(table_name, system_charset_info); protocol->store(operator_name, system_charset_info); send_result_message: DBUG_PRINT("info", ("result_code: %d", result_code)); switch (result_code) { case HA_ADMIN_NOT_IMPLEMENTED: { char buf[ERRMSGSIZE+20]; uint length=my_snprintf(buf, ERRMSGSIZE, ER(ER_CHECK_NOT_IMPLEMENTED), operator_name); protocol->store(STRING_WITH_LEN("note"), system_charset_info); protocol->store(buf, length, system_charset_info); } break; case HA_ADMIN_NOT_BASE_TABLE: { char buf[ERRMSGSIZE+20]; uint length= my_snprintf(buf, ERRMSGSIZE, ER(ER_BAD_TABLE_ERROR), table_name); protocol->store(STRING_WITH_LEN("note"), system_charset_info); protocol->store(buf, length, system_charset_info); } break; case HA_ADMIN_OK: protocol->store(STRING_WITH_LEN("status"), system_charset_info); protocol->store(STRING_WITH_LEN("OK"), system_charset_info); break; case HA_ADMIN_FAILED: protocol->store(STRING_WITH_LEN("status"), system_charset_info); protocol->store(STRING_WITH_LEN("Operation failed"), system_charset_info); break; case HA_ADMIN_REJECT: protocol->store(STRING_WITH_LEN("status"), system_charset_info); protocol->store(STRING_WITH_LEN("Operation need committed state"), system_charset_info); open_for_modify= FALSE; break; case HA_ADMIN_ALREADY_DONE: protocol->store(STRING_WITH_LEN("status"), system_charset_info); protocol->store(STRING_WITH_LEN("Table is already up to date"), system_charset_info); break; case HA_ADMIN_CORRUPT: protocol->store(STRING_WITH_LEN("error"), system_charset_info); protocol->store(STRING_WITH_LEN("Corrupt"), system_charset_info); fatal_error=1; break; case HA_ADMIN_INVALID: protocol->store(STRING_WITH_LEN("error"), system_charset_info); protocol->store(STRING_WITH_LEN("Invalid argument"), system_charset_info); break; case HA_ADMIN_TRY_ALTER: { my_bool save_no_send_ok= thd->net.no_send_ok; /* This is currently used only by InnoDB. ha_innobase::optimize() answers "try with alter", so here we close the table, do an ALTER TABLE, reopen the table and do ha_innobase::analyze() on it. */ ha_autocommit_or_rollback(thd, 0); close_thread_tables(thd); TABLE_LIST *save_next_local= table->next_local, *save_next_global= table->next_global; table->next_local= table->next_global= 0; tmp_disable_binlog(thd); // binlogging is done by caller if wanted thd->net.no_send_ok= TRUE; result_code= mysql_recreate_table(thd, table); thd->net.no_send_ok= save_no_send_ok; reenable_binlog(thd); ha_autocommit_or_rollback(thd, 0); close_thread_tables(thd); if (!result_code) // recreation went ok { if ((table->table= open_ltable(thd, table, lock_type, 0)) && ((result_code= table->table->file->analyze(thd, check_opt)) > 0)) result_code= 0; // analyze went ok } if (result_code) // either mysql_recreate_table or analyze failed { const char *err_msg; if ((err_msg= thd->net.last_error)) { if (!thd->vio_ok()) { sql_print_error(err_msg); } else { /* Hijack the row already in-progress. */ protocol->store(STRING_WITH_LEN("error"), system_charset_info); protocol->store(err_msg, system_charset_info); (void)protocol->write(); /* Start off another row for HA_ADMIN_FAILED */ protocol->prepare_for_resend(); protocol->store(table_name, system_charset_info); protocol->store(operator_name, system_charset_info); } } } result_code= result_code ? HA_ADMIN_FAILED : HA_ADMIN_OK; table->next_local= save_next_local; table->next_global= save_next_global; goto send_result_message; } case HA_ADMIN_WRONG_CHECKSUM: { protocol->store(STRING_WITH_LEN("note"), system_charset_info); protocol->store(ER(ER_VIEW_CHECKSUM), strlen(ER(ER_VIEW_CHECKSUM)), system_charset_info); break; } case HA_ADMIN_NEEDS_UPGRADE: case HA_ADMIN_NEEDS_ALTER: { char buf[ERRMSGSIZE]; uint length; protocol->store(STRING_WITH_LEN("error"), system_charset_info); length=my_snprintf(buf, ERRMSGSIZE, ER(ER_TABLE_NEEDS_UPGRADE), table->table_name); protocol->store(buf, length, system_charset_info); fatal_error=1; break; } default: // Probably HA_ADMIN_INTERNAL_ERROR { char buf[ERRMSGSIZE+20]; uint length=my_snprintf(buf, ERRMSGSIZE, "Unknown - internal error %d during operation", result_code); protocol->store(STRING_WITH_LEN("error"), system_charset_info); protocol->store(buf, length, system_charset_info); fatal_error=1; break; } } if (table->table) { if (fatal_error) table->table->s->version=0; // Force close of table else if (open_for_modify) { if (table->table->s->tmp_table) table->table->file->info(HA_STATUS_CONST); else { pthread_mutex_lock(&LOCK_open); remove_table_from_cache(thd, table->table->s->db.str, table->table->s->table_name.str, RTFC_NO_FLAG); pthread_mutex_unlock(&LOCK_open); } /* May be something modified consequently we have to invalidate cache */ query_cache_invalidate3(thd, table->table, 0); } } ha_autocommit_or_rollback(thd, 0); close_thread_tables(thd); table->table=0; // For query cache if (protocol->write()) goto err; } send_eof(thd); DBUG_RETURN(FALSE); err: ha_autocommit_or_rollback(thd, 1); close_thread_tables(thd); // Shouldn't be needed if (table) table->table=0; DBUG_RETURN(TRUE); } bool mysql_backup_table(THD* thd, TABLE_LIST* table_list) { DBUG_ENTER("mysql_backup_table"); WARN_DEPRECATED(thd, "5.2", "BACKUP TABLE", "MySQL Administrator (mysqldump, mysql)"); DBUG_RETURN(mysql_admin_table(thd, table_list, 0, "backup", TL_READ, 0, 0, 0, 0, &handler::backup, 0)); } bool mysql_restore_table(THD* thd, TABLE_LIST* table_list) { DBUG_ENTER("mysql_restore_table"); WARN_DEPRECATED(thd, "5.2", "RESTORE TABLE", "MySQL Administrator (mysqldump, mysql)"); DBUG_RETURN(mysql_admin_table(thd, table_list, 0, "restore", TL_WRITE, 1, 1, 0, &prepare_for_restore, &handler::restore, 0)); } bool mysql_repair_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt) { DBUG_ENTER("mysql_repair_table"); DBUG_RETURN(mysql_admin_table(thd, tables, check_opt, "repair", TL_WRITE, 1, test(check_opt->sql_flags & TT_USEFRM), HA_OPEN_FOR_REPAIR, &prepare_for_repair, &handler::ha_repair, 0)); } bool mysql_optimize_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt) { DBUG_ENTER("mysql_optimize_table"); DBUG_RETURN(mysql_admin_table(thd, tables, check_opt, "optimize", TL_WRITE, 1,0,0,0, &handler::optimize, 0)); } /* Assigned specified indexes for a table into key cache SYNOPSIS mysql_assign_to_keycache() thd Thread object tables Table list (one table only) RETURN VALUES FALSE ok TRUE error */ bool mysql_assign_to_keycache(THD* thd, TABLE_LIST* tables, LEX_STRING *key_cache_name) { HA_CHECK_OPT check_opt; KEY_CACHE *key_cache; DBUG_ENTER("mysql_assign_to_keycache"); check_opt.init(); pthread_mutex_lock(&LOCK_global_system_variables); if (!(key_cache= get_key_cache(key_cache_name))) { pthread_mutex_unlock(&LOCK_global_system_variables); my_error(ER_UNKNOWN_KEY_CACHE, MYF(0), key_cache_name->str); DBUG_RETURN(TRUE); } pthread_mutex_unlock(&LOCK_global_system_variables); check_opt.key_cache= key_cache; DBUG_RETURN(mysql_admin_table(thd, tables, &check_opt, "assign_to_keycache", TL_READ_NO_INSERT, 0, 0, 0, 0, &handler::assign_to_keycache, 0)); } /* Reassign all tables assigned to a key cache to another key cache SYNOPSIS reassign_keycache_tables() thd Thread object src_cache Reference to the key cache to clean up dest_cache New key cache NOTES This is called when one sets a key cache size to zero, in which case we have to move the tables associated to this key cache to the "default" one. One has to ensure that one never calls this function while some other thread is changing the key cache. This is assured by the caller setting src_cache->in_init before calling this function. We don't delete the old key cache as there may still be pointers pointing to it for a while after this function returns. RETURN VALUES 0 ok */ int reassign_keycache_tables(THD *thd, KEY_CACHE *src_cache, KEY_CACHE *dst_cache) { DBUG_ENTER("reassign_keycache_tables"); DBUG_ASSERT(src_cache != dst_cache); DBUG_ASSERT(src_cache->in_init); src_cache->param_buff_size= 0; // Free key cache ha_resize_key_cache(src_cache); ha_change_key_cache(src_cache, dst_cache); DBUG_RETURN(0); } /* Preload specified indexes for a table into key cache SYNOPSIS mysql_preload_keys() thd Thread object tables Table list (one table only) RETURN VALUES FALSE ok TRUE error */ bool mysql_preload_keys(THD* thd, TABLE_LIST* tables) { DBUG_ENTER("mysql_preload_keys"); /* We cannot allow concurrent inserts. The storage engine reads directly from the index file, bypassing the cache. It could read outdated information if parallel inserts into cache blocks happen. */ DBUG_RETURN(mysql_admin_table(thd, tables, 0, "preload_keys", TL_READ_NO_INSERT, 0, 0, 0, 0, &handler::preload_keys, 0)); } /* Create a table identical to the specified table SYNOPSIS mysql_create_like_table() thd Thread object table Table list element for target table src_table Table list element for source table create_info Create info RETURN VALUES FALSE OK TRUE error */ bool mysql_create_like_table(THD* thd, TABLE_LIST* table, TABLE_LIST* src_table, HA_CREATE_INFO *create_info) { TABLE *name_lock= 0; char src_path[FN_REFLEN], dst_path[FN_REFLEN]; uint dst_path_length; char *db= table->db; char *table_name= table->table_name; int err; bool res= TRUE; uint not_used; #ifdef WITH_PARTITION_STORAGE_ENGINE char tmp_path[FN_REFLEN]; #endif char ts_name[FN_LEN]; DBUG_ENTER("mysql_create_like_table"); /* CREATE TABLE ... LIKE is not allowed for views. */ src_table->required_type= FRMTYPE_TABLE; /* By opening source table we guarantee that it exists and no concurrent DDL operation will mess with it. Later we also take an exclusive name-lock on target table name, which makes copying of .frm file, call to ha_create_table() and binlogging atomic against concurrent DML and DDL operations on target table. Thus by holding both these "locks" we ensure that our statement is properly isolated from all concurrent operations which matter. */ if (open_tables(thd, &src_table, ¬_used, 0)) DBUG_RETURN(TRUE); /* For bug#25875, Newly created table through CREATE TABLE .. LIKE has no ndb_dd attributes; Add something to get possible tablespace info from src table, it can get valid tablespace name only for disk-base ndb table */ if ((src_table->table->file->get_tablespace_name(thd, ts_name, FN_LEN))) { create_info->tablespace= ts_name; create_info->storage_media= HA_SM_DISK; } strxmov(src_path, src_table->table->s->path.str, reg_ext, NullS); DBUG_EXECUTE_IF("sleep_create_like_before_check_if_exists", my_sleep(6000000);); /* Check that destination tables does not exist. Note that its name was already checked when it was added to the table list. */ if (create_info->options & HA_LEX_CREATE_TMP_TABLE) { if (find_temporary_table(thd, db, table_name)) goto table_exists; dst_path_length= build_tmptable_filename(thd, dst_path, sizeof(dst_path)); create_info->table_options|= HA_CREATE_DELAY_KEY_WRITE; } else { if (lock_table_name_if_not_cached(thd, db, table_name, &name_lock)) goto err; if (!name_lock) goto table_exists; dst_path_length= build_table_filename(dst_path, sizeof(dst_path), db, table_name, reg_ext, 0); if (!access(dst_path, F_OK)) goto table_exists; } DBUG_EXECUTE_IF("sleep_create_like_before_copy", my_sleep(6000000);); /* Create a new table by copying from source table Altough exclusive name-lock on target table protects us from concurrent DML and DDL operations on it we still want to wrap .FRM creation and call to ha_create_table() in critical section protected by LOCK_open in order to provide minimal atomicity against operations which disregard name-locks, like I_S implementation, for example. This is a temporary and should not be copied. Instead we should fix our code to always honor name-locks. Also some engines (e.g. NDB cluster) require that LOCK_open should be held during the call to ha_create_table(). See bug #28614 for more info. */ VOID(pthread_mutex_lock(&LOCK_open)); if (my_copy(src_path, dst_path, MYF(MY_DONT_OVERWRITE_FILE))) { if (my_errno == ENOENT) my_error(ER_BAD_DB_ERROR,MYF(0),db); else my_error(ER_CANT_CREATE_FILE,MYF(0),dst_path,my_errno); VOID(pthread_mutex_unlock(&LOCK_open)); goto err; } /* As mysql_truncate don't work on a new table at this stage of creation, instead create the table directly (for both normal and temporary tables). */ #ifdef WITH_PARTITION_STORAGE_ENGINE /* For partitioned tables we need to copy the .par file as well since it is used in open_table_def to even be able to create a new handler. There is no way to find out here if the original table is a partitioned table so we copy the file and ignore any errors. */ fn_format(tmp_path, dst_path, reg_ext, ".par", MYF(MY_REPLACE_EXT)); strmov(dst_path, tmp_path); fn_format(tmp_path, src_path, reg_ext, ".par", MYF(MY_REPLACE_EXT)); strmov(src_path, tmp_path); my_copy(src_path, dst_path, MYF(MY_DONT_OVERWRITE_FILE)); #endif DBUG_EXECUTE_IF("sleep_create_like_before_ha_create", my_sleep(6000000);); dst_path[dst_path_length - reg_ext_length]= '\0'; // Remove .frm if (thd->variables.keep_files_on_create) create_info->options|= HA_CREATE_KEEP_FILES; err= ha_create_table(thd, dst_path, db, table_name, create_info, 1); VOID(pthread_mutex_unlock(&LOCK_open)); if (create_info->options & HA_LEX_CREATE_TMP_TABLE) { if (err || !open_temporary_table(thd, dst_path, db, table_name, 1)) { (void) rm_temporary_table(create_info->db_type, dst_path); /* purecov: inspected */ goto err; /* purecov: inspected */ } } else if (err) { (void) quick_rm_table(create_info->db_type, db, table_name, 0); /* purecov: inspected */ goto err; /* purecov: inspected */ } DBUG_EXECUTE_IF("sleep_create_like_before_binlogging", my_sleep(6000000);); /* We have to write the query before we unlock the tables. */ if (thd->current_stmt_binlog_row_based) { /* Since temporary tables are not replicated under row-based replication, CREATE TABLE ... LIKE ... needs special treatement. We have four cases to consider, according to the following decision table: ==== ========= ========= ============================== Case Target Source Write to binary log ==== ========= ========= ============================== 1 normal normal Original statement 2 normal temporary Generated statement 3 temporary normal Nothing 4 temporary temporary Nothing ==== ========= ========= ============================== */ if (!(create_info->options & HA_LEX_CREATE_TMP_TABLE)) { if (src_table->table->s->tmp_table) // Case 2 { char buf[2048]; String query(buf, sizeof(buf), system_charset_info); query.length(0); // Have to zero it since constructor doesn't /* Here we open the destination table, on which we already have name-lock. This is needed for store_create_info() to work. The table will be closed by unlink_open_table() at the end of this function. */ table->table= name_lock; VOID(pthread_mutex_lock(&LOCK_open)); if (reopen_name_locked_table(thd, table, FALSE)) { VOID(pthread_mutex_unlock(&LOCK_open)); goto err; } VOID(pthread_mutex_unlock(&LOCK_open)); IF_DBUG(int result=) store_create_info(thd, table, &query, create_info); DBUG_ASSERT(result == 0); // store_create_info() always return 0 write_bin_log(thd, TRUE, query.ptr(), query.length()); } else // Case 1 write_bin_log(thd, TRUE, thd->query, thd->query_length); } /* Case 3 and 4 does nothing under RBR */ } else write_bin_log(thd, TRUE, thd->query, thd->query_length); res= FALSE; goto err; table_exists: if (create_info->options & HA_LEX_CREATE_IF_NOT_EXISTS) { char warn_buff[MYSQL_ERRMSG_SIZE]; my_snprintf(warn_buff, sizeof(warn_buff), ER(ER_TABLE_EXISTS_ERROR), table_name); push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_TABLE_EXISTS_ERROR,warn_buff); res= FALSE; } else my_error(ER_TABLE_EXISTS_ERROR, MYF(0), table_name); err: if (name_lock) { pthread_mutex_lock(&LOCK_open); unlink_open_table(thd, name_lock, FALSE); pthread_mutex_unlock(&LOCK_open); } DBUG_RETURN(res); } bool mysql_analyze_table(THD* thd, TABLE_LIST* tables, HA_CHECK_OPT* check_opt) { thr_lock_type lock_type = TL_READ_NO_INSERT; DBUG_ENTER("mysql_analyze_table"); DBUG_RETURN(mysql_admin_table(thd, tables, check_opt, "analyze", lock_type, 1, 0, 0, 0, &handler::analyze, 0)); } bool mysql_check_table(THD* thd, TABLE_LIST* tables,HA_CHECK_OPT* check_opt) { thr_lock_type lock_type = TL_READ_NO_INSERT; DBUG_ENTER("mysql_check_table"); DBUG_RETURN(mysql_admin_table(thd, tables, check_opt, "check", lock_type, 0, 0, HA_OPEN_FOR_REPAIR, 0, &handler::ha_check, &view_checksum)); } /* table_list should contain just one table */ static int mysql_discard_or_import_tablespace(THD *thd, TABLE_LIST *table_list, enum tablespace_op_type tablespace_op) { TABLE *table; my_bool discard; int error; DBUG_ENTER("mysql_discard_or_import_tablespace"); /* Note that DISCARD/IMPORT TABLESPACE always is the only operation in an ALTER TABLE */ thd->proc_info="discard_or_import_tablespace"; discard= test(tablespace_op == DISCARD_TABLESPACE); /* We set this flag so that ha_innobase::open and ::external_lock() do not complain when we lock the table */ thd->tablespace_op= TRUE; if (!(table=open_ltable(thd, table_list, TL_WRITE, 0))) { thd->tablespace_op=FALSE; DBUG_RETURN(-1); } error=table->file->discard_or_import_tablespace(discard); thd->proc_info="end"; if (error) goto err; /* The 0 in the call below means 'not in a transaction', which means immediate invalidation; that is probably what we wish here */ query_cache_invalidate3(thd, table_list, 0); /* The ALTER TABLE is always in its own transaction */ error = ha_commit_stmt(thd); if (ha_commit(thd)) error=1; if (error) goto err; write_bin_log(thd, FALSE, thd->query, thd->query_length); err: ha_autocommit_or_rollback(thd, error); close_thread_tables(thd); thd->tablespace_op=FALSE; if (error == 0) { send_ok(thd); DBUG_RETURN(0); } table->file->print_error(error, MYF(0)); DBUG_RETURN(-1); } /* SYNOPSIS compare_tables() table The original table. alter_info Alter options, fields and keys for the new table. create_info Create options for the new table. order_num Number of order list elements. need_copy_table OUT Result of the comparison. Undefined if error. Otherwise is one of: ALTER_TABLE_METADATA_ONLY No copy needed ALTER_TABLE_DATA_CHANGED Data changes, copy needed ALTER_TABLE_INDEX_CHANGED Index changes, copy might be needed key_info_buffer OUT An array of KEY structs for new indexes index_drop_buffer OUT An array of offsets into table->key_info. index_drop_count OUT The number of elements in the array. index_add_buffer OUT An array of offsets into key_info_buffer. index_add_count OUT The number of elements in the array. DESCRIPTION 'table' (first argument) contains information of the original table, which includes all corresponding parts that the new table has in arguments create_list, key_list and create_info. By comparing the changes between the original and new table we can determine how much it has changed after ALTER TABLE and whether we need to make a copy of the table, or just change the .frm file. If there are no data changes, but index changes, 'index_drop_buffer' and/or 'index_add_buffer' are populated with offsets into table->key_info or key_info_buffer respectively for the indexes that need to be dropped and/or (re-)created. RETURN VALUES TRUE error FALSE success */ static bool compare_tables(TABLE *table, Alter_info *alter_info, HA_CREATE_INFO *create_info, uint order_num, enum_alter_table_change_level *need_copy_table, KEY **key_info_buffer, uint **index_drop_buffer, uint *index_drop_count, uint **index_add_buffer, uint *index_add_count) { Field **f_ptr, *field; uint changes= 0, tmp; uint key_count; List_iterator_fast<Create_field> new_field_it(alter_info->create_list); Create_field *new_field; KEY_PART_INFO *key_part; KEY_PART_INFO *end; /* Remember if the new definition has new VARCHAR column; create_info->varchar will be reset in mysql_prepare_create_table. */ bool varchar= create_info->varchar; DBUG_ENTER("compare_tables"); { THD *thd= table->in_use; /* Create a copy of alter_info. To compare the new and old table definitions, we need to "prepare" the new definition - transform it from parser output to a format that describes the final table layout (all column defaults are initialized, duplicate columns are removed). This is done by mysql_prepare_create_table. Unfortunately, mysql_prepare_create_table performs its transformations "in-place", that is, modifies the argument. Since we would like to keep compare_tables() idempotent (not altering any of the arguments) we create a copy of alter_info here and pass it to mysql_prepare_create_table, then use the result to evaluate possibility of fast ALTER TABLE, and then destroy the copy. */ Alter_info tmp_alter_info(*alter_info, thd->mem_root); uint db_options= 0; /* not used */ /* Create the prepared information. */ if (mysql_prepare_create_table(thd, create_info, &tmp_alter_info, (table->s->tmp_table != NO_TMP_TABLE), &db_options, table->file, key_info_buffer, &key_count, 0)) DBUG_RETURN(1); /* Allocate result buffers. */ if (! (*index_drop_buffer= (uint*) thd->alloc(sizeof(uint) * table->s->keys)) || ! (*index_add_buffer= (uint*) thd->alloc(sizeof(uint) * tmp_alter_info.key_list.elements))) DBUG_RETURN(1); } /* Some very basic checks. If number of fields changes, or the handler, we need to run full ALTER TABLE. In the future new fields can be added and old dropped without copy, but not yet. Test also that engine was not given during ALTER TABLE, or we are force to run regular alter table (copy). E.g. ALTER TABLE tbl_name ENGINE=MyISAM. For the following ones we also want to run regular alter table: ALTER TABLE tbl_name ORDER BY .. ALTER TABLE tbl_name CONVERT TO CHARACTER SET .. At the moment we can't handle altering temporary tables without a copy. We also test if OPTIMIZE TABLE was given and was mapped to alter table. In that case we always do full copy. There was a bug prior to mysql-4.0.25. Number of null fields was calculated incorrectly. As a result frm and data files gets out of sync after fast alter table. There is no way to determine by which mysql version (in 4.0 and 4.1 branches) table was created, thus we disable fast alter table for all tables created by mysql versions prior to 5.0 branch. See BUG#6236. */ if (table->s->fields != alter_info->create_list.elements || table->s->db_type() != create_info->db_type || table->s->tmp_table || create_info->used_fields & HA_CREATE_USED_ENGINE || create_info->used_fields & HA_CREATE_USED_CHARSET || create_info->used_fields & HA_CREATE_USED_DEFAULT_CHARSET || (alter_info->flags & (ALTER_RECREATE | ALTER_FOREIGN_KEY)) || order_num || !table->s->mysql_version || (table->s->frm_version < FRM_VER_TRUE_VARCHAR && varchar)) { *need_copy_table= ALTER_TABLE_DATA_CHANGED; DBUG_RETURN(0); } /* Go through fields and check if the original ones are compatible with new table. */ for (f_ptr= table->field, new_field= new_field_it++; (field= *f_ptr); f_ptr++, new_field= new_field_it++) { /* Make sure we have at least the default charset in use. */ if (!new_field->charset) new_field->charset= create_info->default_table_charset; /* Check that NULL behavior is same for old and new fields */ if ((new_field->flags & NOT_NULL_FLAG) != (uint) (field->flags & NOT_NULL_FLAG)) { *need_copy_table= ALTER_TABLE_DATA_CHANGED; DBUG_RETURN(0); } /* Don't pack rows in old tables if the user has requested this. */ if ((new_field->flags & BLOB_FLAG) || new_field->sql_type == MYSQL_TYPE_VARCHAR && create_info->row_type != ROW_TYPE_FIXED) create_info->table_options|= HA_OPTION_PACK_RECORD; /* Check if field was renamed */ field->flags&= ~FIELD_IS_RENAMED; if (my_strcasecmp(system_charset_info, field->field_name, new_field->field_name)) field->flags|= FIELD_IS_RENAMED; /* Evaluate changes bitmap and send to check_if_incompatible_data() */ if (!(tmp= field->is_equal(new_field))) { *need_copy_table= ALTER_TABLE_DATA_CHANGED; DBUG_RETURN(0); } // Clear indexed marker field->flags&= ~FIELD_IN_ADD_INDEX; changes|= tmp; } /* Go through keys and check if the original ones are compatible with new table. */ KEY *table_key; KEY *table_key_end= table->key_info + table->s->keys; KEY *new_key; KEY *new_key_end= *key_info_buffer + key_count; DBUG_PRINT("info", ("index count old: %d new: %d", table->s->keys, key_count)); /* Step through all keys of the old table and search matching new keys. */ *index_drop_count= 0; *index_add_count= 0; for (table_key= table->key_info; table_key < table_key_end; table_key++) { KEY_PART_INFO *table_part; KEY_PART_INFO *table_part_end= table_key->key_part + table_key->key_parts; KEY_PART_INFO *new_part; /* Search a new key with the same name. */ for (new_key= *key_info_buffer; new_key < new_key_end; new_key++) { if (! strcmp(table_key->name, new_key->name)) break; } if (new_key >= new_key_end) { /* Key not found. Add the offset of the key to the drop buffer. */ (*index_drop_buffer)[(*index_drop_count)++]= table_key - table->key_info; DBUG_PRINT("info", ("index dropped: '%s'", table_key->name)); continue; } /* Check that the key types are compatible between old and new tables. */ if ((table_key->algorithm != new_key->algorithm) || ((table_key->flags & HA_KEYFLAG_MASK) != (new_key->flags & HA_KEYFLAG_MASK)) || (table_key->key_parts != new_key->key_parts)) goto index_changed; /* Check that the key parts remain compatible between the old and new tables. */ for (table_part= table_key->key_part, new_part= new_key->key_part; table_part < table_part_end; table_part++, new_part++) { /* Key definition has changed if we are using a different field or if the used key part length is different. We know that the fields did not change. Comparing field numbers is sufficient. */ if ((table_part->length != new_part->length) || (table_part->fieldnr - 1 != new_part->fieldnr)) goto index_changed; } continue; index_changed: /* Key modified. Add the offset of the key to both buffers. */ (*index_drop_buffer)[(*index_drop_count)++]= table_key - table->key_info; (*index_add_buffer)[(*index_add_count)++]= new_key - *key_info_buffer; key_part= new_key->key_part; end= key_part + new_key->key_parts; for(; key_part != end; key_part++) { // Mark field to be part of new key field= table->field[key_part->fieldnr]; field->flags|= FIELD_IN_ADD_INDEX; } DBUG_PRINT("info", ("index changed: '%s'", table_key->name)); } /*end of for (; table_key < table_key_end;) */ /* Step through all keys of the new table and find matching old keys. */ for (new_key= *key_info_buffer; new_key < new_key_end; new_key++) { /* Search an old key with the same name. */ for (table_key= table->key_info; table_key < table_key_end; table_key++) { if (! strcmp(table_key->name, new_key->name)) break; } if (table_key >= table_key_end) { /* Key not found. Add the offset of the key to the add buffer. */ (*index_add_buffer)[(*index_add_count)++]= new_key - *key_info_buffer; key_part= new_key->key_part; end= key_part + new_key->key_parts; for(; key_part != end; key_part++) { // Mark field to be part of new key field= table->field[key_part->fieldnr]; field->flags|= FIELD_IN_ADD_INDEX; } DBUG_PRINT("info", ("index added: '%s'", new_key->name)); } } /* Check if changes are compatible with current handler without a copy */ if (table->file->check_if_incompatible_data(create_info, changes)) { *need_copy_table= ALTER_TABLE_DATA_CHANGED; DBUG_RETURN(0); } if (*index_drop_count || *index_add_count) { *need_copy_table= ALTER_TABLE_INDEX_CHANGED; DBUG_RETURN(0); } *need_copy_table= ALTER_TABLE_METADATA_ONLY; // Tables are compatible DBUG_RETURN(0); } /* Manages enabling/disabling of indexes for ALTER TABLE SYNOPSIS alter_table_manage_keys() table Target table indexes_were_disabled Whether the indexes of the from table were disabled keys_onoff ENABLE | DISABLE | LEAVE_AS_IS RETURN VALUES FALSE OK TRUE Error */ static bool alter_table_manage_keys(TABLE *table, int indexes_were_disabled, enum enum_enable_or_disable keys_onoff) { int error= 0; DBUG_ENTER("alter_table_manage_keys"); DBUG_PRINT("enter", ("table=%p were_disabled=%d on_off=%d", table, indexes_were_disabled, keys_onoff)); switch (keys_onoff) { case ENABLE: error= table->file->enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE); break; case LEAVE_AS_IS: if (!indexes_were_disabled) break; /* fall-through: disabled indexes */ case DISABLE: error= table->file->disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE); } if (error == HA_ERR_WRONG_COMMAND) { push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_ILLEGAL_HA, ER(ER_ILLEGAL_HA), table->s->table_name); error= 0; } else if (error) table->file->print_error(error, MYF(0)); DBUG_RETURN(error); } /** Prepare column and key definitions for CREATE TABLE in ALTER TABLE. This function transforms parse output of ALTER TABLE - lists of columns and keys to add, drop or modify into, essentially, CREATE TABLE definition - a list of columns and keys of the new table. While doing so, it also performs some (bug not all) semantic checks. This function is invoked when we know that we're going to perform ALTER TABLE via a temporary table -- i.e. fast ALTER TABLE is not possible, perhaps because the ALTER statement contains instructions that require change in table data, not only in table definition or indexes. @param[in,out] thd thread handle. Used as a memory pool and source of environment information. @param[in] table the source table, open and locked Used as an interface to the storage engine to acquire additional information about the original table. @param[in,out] create_info A blob with CREATE/ALTER TABLE parameters @param[in,out] alter_info Another blob with ALTER/CREATE parameters. Originally create_info was used only in CREATE TABLE and alter_info only in ALTER TABLE. But since ALTER might end-up doing CREATE, this distinction is gone and we just carry around two structures. @return Fills various create_info members based on information retrieved from the storage engine. Sets create_info->varchar if the table has a VARCHAR column. Prepares alter_info->create_list and alter_info->key_list with columns and keys of the new table. @retval TRUE error, out of memory or a semantical error in ALTER TABLE instructions @retval FALSE success */ static bool mysql_prepare_alter_table(THD *thd, TABLE *table, HA_CREATE_INFO *create_info, Alter_info *alter_info) { /* New column definitions are added here */ List<Create_field> new_create_list; /* New key definitions are added here */ List<Key> new_key_list; List_iterator<Alter_drop> drop_it(alter_info->drop_list); List_iterator<Create_field> def_it(alter_info->create_list); List_iterator<Alter_column> alter_it(alter_info->alter_list); List_iterator<Key> key_it(alter_info->key_list); List_iterator<Create_field> find_it(new_create_list); List_iterator<Create_field> field_it(new_create_list); List<Key_part_spec> key_parts; uint db_create_options= (table->s->db_create_options & ~(HA_OPTION_PACK_RECORD)); uint used_fields= create_info->used_fields; KEY *key_info=table->key_info; bool rc= TRUE; DBUG_ENTER("mysql_prepare_alter_table"); create_info->varchar= FALSE; /* Let new create options override the old ones */ if (!(used_fields & HA_CREATE_USED_MIN_ROWS)) create_info->min_rows= table->s->min_rows; if (!(used_fields & HA_CREATE_USED_MAX_ROWS)) create_info->max_rows= table->s->max_rows; if (!(used_fields & HA_CREATE_USED_AVG_ROW_LENGTH)) create_info->avg_row_length= table->s->avg_row_length; if (!(used_fields & HA_CREATE_USED_DEFAULT_CHARSET)) create_info->default_table_charset= table->s->table_charset; if (!(used_fields & HA_CREATE_USED_AUTO) && table->found_next_number_field) { /* Table has an autoincrement, copy value to new table */ table->file->info(HA_STATUS_AUTO); create_info->auto_increment_value= table->file->stats.auto_increment_value; } if (!(used_fields & HA_CREATE_USED_KEY_BLOCK_SIZE)) create_info->key_block_size= table->s->key_block_size; if (!(used_fields & HA_CREATE_USED_TRANSACTIONAL)) create_info->transactional= table->s->transactional; if (!create_info->tablespace && create_info->storage_media != HA_SM_MEMORY) { char *tablespace= static_cast<char *>(thd->alloc(FN_LEN)); /* Regular alter table of disk stored table (no tablespace/storage change) Copy tablespace name */ if (tablespace && (table->file->get_tablespace_name(thd, tablespace, FN_LEN))) create_info->tablespace= tablespace; } restore_record(table, s->default_values); // Empty record for DEFAULT Create_field *def; /* First collect all fields from table which isn't in drop_list */ Field **f_ptr,*field; for (f_ptr=table->field ; (field= *f_ptr) ; f_ptr++) { if (field->type() == MYSQL_TYPE_STRING) create_info->varchar= TRUE; /* Check if field should be dropped */ Alter_drop *drop; drop_it.rewind(); while ((drop=drop_it++)) { if (drop->type == Alter_drop::COLUMN && !my_strcasecmp(system_charset_info,field->field_name, drop->name)) { /* Reset auto_increment value if it was dropped */ if (MTYP_TYPENR(field->unireg_check) == Field::NEXT_NUMBER && !(used_fields & HA_CREATE_USED_AUTO)) { create_info->auto_increment_value=0; create_info->used_fields|=HA_CREATE_USED_AUTO; } break; } } if (drop) { drop_it.remove(); continue; } /* Check if field is changed */ def_it.rewind(); while ((def=def_it++)) { if (def->change && !my_strcasecmp(system_charset_info,field->field_name, def->change)) break; } if (def) { // Field is changed def->field=field; if (!def->after) { new_create_list.push_back(def); def_it.remove(); } } else { /* This field was not dropped and not changed, add it to the list for the new table. */ def= new Create_field(field, field); new_create_list.push_back(def); alter_it.rewind(); // Change default if ALTER Alter_column *alter; while ((alter=alter_it++)) { if (!my_strcasecmp(system_charset_info,field->field_name, alter->name)) break; } if (alter) { if (def->sql_type == MYSQL_TYPE_BLOB) { my_error(ER_BLOB_CANT_HAVE_DEFAULT, MYF(0), def->change); goto err; } if ((def->def=alter->def)) // Use new default def->flags&= ~NO_DEFAULT_VALUE_FLAG; else def->flags|= NO_DEFAULT_VALUE_FLAG; alter_it.remove(); } } } def_it.rewind(); while ((def=def_it++)) // Add new columns { if (def->change && ! def->field) { my_error(ER_BAD_FIELD_ERROR, MYF(0), def->change, table->s->table_name); goto err; } /* Check that the DATE/DATETIME not null field we are going to add is either has a default value or the '0000-00-00' is allowed by the set sql mode. If the '0000-00-00' value isn't allowed then raise the error_if_not_empty flag to allow ALTER TABLE only if the table to be altered is empty. */ if ((def->sql_type == MYSQL_TYPE_DATE || def->sql_type == MYSQL_TYPE_NEWDATE || def->sql_type == MYSQL_TYPE_DATETIME) && !alter_info->datetime_field && !(~def->flags & (NO_DEFAULT_VALUE_FLAG | NOT_NULL_FLAG)) && thd->variables.sql_mode & MODE_NO_ZERO_DATE) { alter_info->datetime_field= def; alter_info->error_if_not_empty= TRUE; } if (!def->after) new_create_list.push_back(def); else if (def->after == first_keyword) new_create_list.push_front(def); else { Create_field *find; find_it.rewind(); while ((find=find_it++)) // Add new columns { if (!my_strcasecmp(system_charset_info,def->after, find->field_name)) break; } if (!find) { my_error(ER_BAD_FIELD_ERROR, MYF(0), def->after, table->s->table_name); goto err; } find_it.after(def); // Put element after this alter_info->change_level= ALTER_TABLE_DATA_CHANGED; } } if (alter_info->alter_list.elements) { my_error(ER_BAD_FIELD_ERROR, MYF(0), alter_info->alter_list.head()->name, table->s->table_name); goto err; } if (!new_create_list.elements) { my_message(ER_CANT_REMOVE_ALL_FIELDS, ER(ER_CANT_REMOVE_ALL_FIELDS), MYF(0)); goto err; } /* Collect all keys which isn't in drop list. Add only those for which some fields exists. */ for (uint i=0 ; i < table->s->keys ; i++,key_info++) { char *key_name= key_info->name; Alter_drop *drop; drop_it.rewind(); while ((drop=drop_it++)) { if (drop->type == Alter_drop::KEY && !my_strcasecmp(system_charset_info,key_name, drop->name)) break; } if (drop) { drop_it.remove(); continue; } KEY_PART_INFO *key_part= key_info->key_part; key_parts.empty(); for (uint j=0 ; j < key_info->key_parts ; j++,key_part++) { if (!key_part->field) continue; // Wrong field (from UNIREG) const char *key_part_name=key_part->field->field_name; Create_field *cfield; field_it.rewind(); while ((cfield=field_it++)) { if (cfield->change) { if (!my_strcasecmp(system_charset_info, key_part_name, cfield->change)) break; } else if (!my_strcasecmp(system_charset_info, key_part_name, cfield->field_name)) break; } if (!cfield) continue; // Field is removed uint key_part_length=key_part->length; if (cfield->field) // Not new field { /* If the field can't have only a part used in a key according to its new type, or should not be used partially according to its previous type, or the field length is less than the key part length, unset the key part length. We also unset the key part length if it is the same as the old field's length, so the whole new field will be used. BLOBs may have cfield->length == 0, which is why we test it before checking whether cfield->length < key_part_length (in chars). */ if (!Field::type_can_have_key_part(cfield->field->type()) || !Field::type_can_have_key_part(cfield->sql_type) || /* spatial keys can't have sub-key length */ (key_info->flags & HA_SPATIAL) || (cfield->field->field_length == key_part_length && !f_is_blob(key_part->key_type)) || (cfield->length && (cfield->length < key_part_length / key_part->field->charset()->mbmaxlen))) key_part_length= 0; // Use whole field } key_part_length /= key_part->field->charset()->mbmaxlen; key_parts.push_back(new Key_part_spec(cfield->field_name, key_part_length)); } if (key_parts.elements) { KEY_CREATE_INFO key_create_info; Key *key; enum Key::Keytype key_type; bzero((char*) &key_create_info, sizeof(key_create_info)); key_create_info.algorithm= key_info->algorithm; if (key_info->flags & HA_USES_BLOCK_SIZE) key_create_info.block_size= key_info->block_size; if (key_info->flags & HA_USES_PARSER) key_create_info.parser_name= *key_info->parser_name; if (key_info->flags & HA_SPATIAL) key_type= Key::SPATIAL; else if (key_info->flags & HA_NOSAME) { if (! my_strcasecmp(system_charset_info, key_name, primary_key_name)) key_type= Key::PRIMARY; else key_type= Key::UNIQUE; } else if (key_info->flags & HA_FULLTEXT) key_type= Key::FULLTEXT; else key_type= Key::MULTIPLE; key= new Key(key_type, key_name, &key_create_info, test(key_info->flags & HA_GENERATED_KEY), key_parts); new_key_list.push_back(key); } } { Key *key; while ((key=key_it++)) // Add new keys { if (key->type != Key::FOREIGN_KEY) new_key_list.push_back(key); if (key->name && !my_strcasecmp(system_charset_info,key->name,primary_key_name)) { my_error(ER_WRONG_NAME_FOR_INDEX, MYF(0), key->name); goto err; } } } if (alter_info->drop_list.elements) { my_error(ER_CANT_DROP_FIELD_OR_KEY, MYF(0), alter_info->drop_list.head()->name); goto err; } if (alter_info->alter_list.elements) { my_error(ER_CANT_DROP_FIELD_OR_KEY, MYF(0), alter_info->alter_list.head()->name); goto err; } if (!create_info->comment.str) { create_info->comment.str= table->s->comment.str; create_info->comment.length= table->s->comment.length; } table->file->update_create_info(create_info); if ((create_info->table_options & (HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS)) || (used_fields & HA_CREATE_USED_PACK_KEYS)) db_create_options&= ~(HA_OPTION_PACK_KEYS | HA_OPTION_NO_PACK_KEYS); if (create_info->table_options & (HA_OPTION_CHECKSUM | HA_OPTION_NO_CHECKSUM)) db_create_options&= ~(HA_OPTION_CHECKSUM | HA_OPTION_NO_CHECKSUM); if (create_info->table_options & (HA_OPTION_DELAY_KEY_WRITE | HA_OPTION_NO_DELAY_KEY_WRITE)) db_create_options&= ~(HA_OPTION_DELAY_KEY_WRITE | HA_OPTION_NO_DELAY_KEY_WRITE); create_info->table_options|= db_create_options; if (table->s->tmp_table) create_info->options|=HA_LEX_CREATE_TMP_TABLE; rc= FALSE; alter_info->create_list.swap(new_create_list); alter_info->key_list.swap(new_key_list); err: DBUG_RETURN(rc); } /* Alter table SYNOPSIS mysql_alter_table() thd Thread handle new_db If there is a RENAME clause new_name If there is a RENAME clause create_info Information from the parsing phase about new table properties. table_list The table to change. alter_info Lists of fields, keys to be changed, added or dropped. order_num How many ORDER BY fields has been specified. order List of fields to ORDER BY. ignore Whether we have ALTER IGNORE TABLE DESCRIPTION This is a veery long function and is everything but the kitchen sink :) It is used to alter a table and not only by ALTER TABLE but also CREATE|DROP INDEX are mapped on this function. When the ALTER TABLE statement just does a RENAME or ENABLE|DISABLE KEYS, or both, then this function short cuts its operation by renaming the table and/or enabling/disabling the keys. In this case, the FRM is not changed, directly by mysql_alter_table. However, if there is a RENAME + change of a field, or an index, the short cut is not used. See how `create_list` is used to generate the new FRM regarding the structure of the fields. The same is done for the indices of the table. Important is the fact, that this function tries to do as little work as possible, by finding out whether a intermediate table is needed to copy data into and when finishing the altering to use it as the original table. For this reason the function compare_tables() is called, which decides based on all kind of data how similar are the new and the original tables. RETURN VALUES FALSE OK TRUE Error */ bool mysql_alter_table(THD *thd,char *new_db, char *new_name, HA_CREATE_INFO *create_info, TABLE_LIST *table_list, Alter_info *alter_info, uint order_num, ORDER *order, bool ignore) { TABLE *table, *new_table= 0, *name_lock= 0; int error= 0; char tmp_name[80],old_name[32],new_name_buff[FN_REFLEN]; char new_alias_buff[FN_REFLEN], *table_name, *db, *new_alias, *alias; char index_file[FN_REFLEN], data_file[FN_REFLEN]; char path[FN_REFLEN]; char reg_path[FN_REFLEN+1]; ha_rows copied,deleted; handlerton *old_db_type, *new_db_type, *save_old_db_type; legacy_db_type table_type; frm_type_enum frm_type; enum_alter_table_change_level need_copy_table= ALTER_TABLE_METADATA_ONLY; #ifdef WITH_PARTITION_STORAGE_ENGINE uint fast_alter_partition= 0; bool partition_changed= FALSE; #endif bool need_lock_for_indexes= TRUE; KEY *key_info_buffer; uint index_drop_count; uint *index_drop_buffer; uint index_add_count; uint *index_add_buffer; bool committed= 0; DBUG_ENTER("mysql_alter_table"); LINT_INIT(index_add_count); LINT_INIT(index_drop_count); LINT_INIT(index_add_buffer); LINT_INIT(index_drop_buffer); /* Check if we attempt to alter mysql.slow_log or mysql.general_log table and return an error if it is the case. TODO: this design is obsolete and will be removed. */ if (table_list && table_list->db && table_list->table_name) { int table_kind= 0; table_kind= check_if_log_table(table_list->db_length, table_list->db, table_list->table_name_length, table_list->table_name, 0); if (table_kind) { /* Disable alter of enabled log tables */ if (logger.is_log_table_enabled(table_kind)) { my_error(ER_BAD_LOG_STATEMENT, MYF(0), "ALTER"); DBUG_RETURN(TRUE); } /* Disable alter of log tables to unsupported engine */ if ((create_info->used_fields & HA_CREATE_USED_ENGINE) && (!create_info->db_type || /* unknown engine */ !(create_info->db_type->flags & HTON_SUPPORT_LOG_TABLES))) { my_error(ER_UNSUPORTED_LOG_ENGINE, MYF(0)); DBUG_RETURN(TRUE); } #ifdef WITH_PARTITION_STORAGE_ENGINE if (alter_info->flags & ALTER_PARTITION) { my_error(ER_WRONG_USAGE, MYF(0), "PARTITION", "log table"); DBUG_RETURN(TRUE); } #endif } } /* Assign variables table_name, new_name, db, new_db, path, reg_path to simplify further comparisions: we want to see if it's a RENAME later just by comparing the pointers, avoiding the need for strcmp. */ thd->proc_info="init"; table_name=table_list->table_name; alias= (lower_case_table_names == 2) ? table_list->alias : table_name; db=table_list->db; if (!new_db || !my_strcasecmp(table_alias_charset, new_db, db)) new_db= db; build_table_filename(reg_path, sizeof(reg_path), db, table_name, reg_ext, 0); build_table_filename(path, sizeof(path), db, table_name, "", 0); mysql_ha_flush(thd, table_list, MYSQL_HA_CLOSE_FINAL, FALSE); /* DISCARD/IMPORT TABLESPACE is always alone in an ALTER TABLE */ if (alter_info->tablespace_op != NO_TABLESPACE_OP) /* Conditionally writes to binlog. */ DBUG_RETURN(mysql_discard_or_import_tablespace(thd,table_list, alter_info->tablespace_op)); strxnmov(new_name_buff, sizeof (new_name_buff) - 1, mysql_data_home, "/", db, "/", table_name, reg_ext, NullS); (void) unpack_filename(new_name_buff, new_name_buff); /* If this is just a rename of a view, short cut to the following scenario: 1) lock LOCK_open 2) do a RENAME 2) unlock LOCK_open. This is a copy-paste added to make sure ALTER (sic:) TABLE .. RENAME works for views. ALTER VIEW is handled as an independent branch in mysql_execute_command. The need for a copy-paste arose because the main code flow of ALTER TABLE ... RENAME tries to use open_ltable, which does not work for views (open_ltable was never modified to merge table lists of child tables into the main table list, like open_tables does). This code is wrong and will be removed, please do not copy. */ frm_type= mysql_frm_type(thd, new_name_buff, &table_type); /* Rename a view */ /* Sic: there is a race here */ if (frm_type == FRMTYPE_VIEW && !(alter_info->flags & ~ALTER_RENAME)) { /* Avoid problems with a rename on a table that we have locked or if the user is trying to to do this in a transcation context */ if (thd->locked_tables || thd->active_transaction()) { my_message(ER_LOCK_OR_ACTIVE_TRANSACTION, ER(ER_LOCK_OR_ACTIVE_TRANSACTION), MYF(0)); DBUG_RETURN(TRUE); } if (wait_if_global_read_lock(thd,0,1)) DBUG_RETURN(TRUE); VOID(pthread_mutex_lock(&LOCK_open)); if (lock_table_names(thd, table_list)) { error= 1; goto view_err; } if (!do_rename(thd, table_list, new_db, new_name, new_name, 1)) { if (mysql_bin_log.is_open()) { thd->clear_error(); Query_log_event qinfo(thd, thd->query, thd->query_length, 0, FALSE); mysql_bin_log.write(&qinfo); } send_ok(thd); } unlock_table_names(thd, table_list, (TABLE_LIST*) 0); view_err: pthread_mutex_unlock(&LOCK_open); start_waiting_global_read_lock(thd); DBUG_RETURN(error); } if (!(table=open_ltable(thd, table_list, TL_WRITE_ALLOW_READ, 0))) DBUG_RETURN(TRUE); table->use_all_columns(); /* Check that we are not trying to rename to an existing table */ if (new_name) { DBUG_PRINT("info", ("new_db.new_name: '%s'.'%s'", new_db, new_name)); strmov(new_name_buff,new_name); strmov(new_alias= new_alias_buff, new_name); if (lower_case_table_names) { if (lower_case_table_names != 2) { my_casedn_str(files_charset_info, new_name_buff); new_alias= new_name; // Create lower case table name } my_casedn_str(files_charset_info, new_name); } if (new_db == db && !my_strcasecmp(table_alias_charset, new_name_buff, table_name)) { /* Source and destination table names are equal: make later check easier. */ new_alias= new_name= table_name; } else { if (table->s->tmp_table != NO_TMP_TABLE) { if (find_temporary_table(thd,new_db,new_name_buff)) { my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_name_buff); DBUG_RETURN(TRUE); } } else { if (lock_table_name_if_not_cached(thd, new_db, new_name, &name_lock)) DBUG_RETURN(TRUE); if (!name_lock) { my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_alias); DBUG_RETURN(TRUE); } build_table_filename(new_name_buff, sizeof(new_name_buff), new_db, new_name_buff, reg_ext, 0); if (!access(new_name_buff, F_OK)) { /* Table will be closed in do_command() */ my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_alias); goto err; } } } } else { new_alias= (lower_case_table_names == 2) ? alias : table_name; new_name= table_name; } old_db_type= table->s->db_type(); if (!create_info->db_type) { #ifdef WITH_PARTITION_STORAGE_ENGINE if (table->part_info && create_info->used_fields & HA_CREATE_USED_ENGINE) { /* This case happens when the user specified ENGINE = x where x is a non-existing storage engine We set create_info->db_type to default_engine_type to ensure we don't change underlying engine type due to a erroneously given engine name. */ create_info->db_type= table->part_info->default_engine_type; } else #endif create_info->db_type= old_db_type; } if (check_engine(thd, new_name, create_info)) goto err; new_db_type= create_info->db_type; if (new_db_type != old_db_type && !table->file->can_switch_engines()) { my_error(ER_ROW_IS_REFERENCED, MYF(0)); goto err; } if (create_info->row_type == ROW_TYPE_NOT_USED) create_info->row_type= table->s->row_type; DBUG_PRINT("info", ("old type: %s new type: %s", ha_resolve_storage_engine_name(old_db_type), ha_resolve_storage_engine_name(new_db_type))); if (ha_check_storage_engine_flag(old_db_type, HTON_ALTER_NOT_SUPPORTED) || ha_check_storage_engine_flag(new_db_type, HTON_ALTER_NOT_SUPPORTED)) { DBUG_PRINT("info", ("doesn't support alter")); my_error(ER_ILLEGAL_HA, MYF(0), table_name); goto err; } thd->proc_info="setup"; if (!(alter_info->flags & ~(ALTER_RENAME | ALTER_KEYS_ONOFF)) && !table->s->tmp_table) // no need to touch frm { switch (alter_info->keys_onoff) { case LEAVE_AS_IS: break; case ENABLE: /* wait_while_table_is_used() ensures that table being altered is opened only by this thread and that TABLE::TABLE_SHARE::version of TABLE object corresponding to this table is 0. The latter guarantees that no DML statement will open this table until ALTER TABLE finishes (i.e. until close_thread_tables()) while the fact that the table is still open gives us protection from concurrent DDL statements. */ VOID(pthread_mutex_lock(&LOCK_open)); wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN); VOID(pthread_mutex_unlock(&LOCK_open)); DBUG_EXECUTE_IF("sleep_alter_enable_indexes", my_sleep(6000000);); error= table->file->enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE); /* COND_refresh will be signaled in close_thread_tables() */ break; case DISABLE: VOID(pthread_mutex_lock(&LOCK_open)); wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN); VOID(pthread_mutex_unlock(&LOCK_open)); error=table->file->disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE); /* COND_refresh will be signaled in close_thread_tables() */ break; default: DBUG_ASSERT(FALSE); error= 0; break; } if (error == HA_ERR_WRONG_COMMAND) { error= 0; push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_ILLEGAL_HA, ER(ER_ILLEGAL_HA), table->alias); } VOID(pthread_mutex_lock(&LOCK_open)); /* Unlike to the above case close_cached_table() below will remove ALL instances of TABLE from table cache (it will also remove table lock held by this thread). So to make actual table renaming and writing to binlog atomic we have to put them into the same critical section protected by LOCK_open mutex. This also removes gap for races between access() and mysql_rename_table() calls. */ if (!error && (new_name != table_name || new_db != db)) { thd->proc_info="rename"; /* Then do a 'simple' rename of the table. First we need to close all instances of 'source' table. */ close_cached_table(thd, table); /* Then, we want check once again that target table does not exist. Actually the order of these two steps does not matter since earlier we took name-lock on the target table, so we do them in this particular order only to be consistent with 5.0, in which we don't take this name-lock and where this order really matters. TODO: Investigate if we need this access() check at all. */ if (!access(new_name_buff,F_OK)) { my_error(ER_TABLE_EXISTS_ERROR, MYF(0), new_name); error= -1; } else { *fn_ext(new_name)=0; if (mysql_rename_table(old_db_type,db,table_name,new_db,new_alias, 0)) error= -1; else if (Table_triggers_list::change_table_name(thd, db, table_name, new_db, new_alias)) { VOID(mysql_rename_table(old_db_type, new_db, new_alias, db, table_name, 0)); error= -1; } } } if (error == HA_ERR_WRONG_COMMAND) { error= 0; push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_ILLEGAL_HA, ER(ER_ILLEGAL_HA), table->alias); } if (!error) { write_bin_log(thd, TRUE, thd->query, thd->query_length); send_ok(thd); } else if (error > 0) { table->file->print_error(error, MYF(0)); error= -1; } if (name_lock) unlink_open_table(thd, name_lock, FALSE); VOID(pthread_mutex_unlock(&LOCK_open)); table_list->table= NULL; // For query cache query_cache_invalidate3(thd, table_list, 0); DBUG_RETURN(error); } /* We have to do full alter table. */ #ifdef WITH_PARTITION_STORAGE_ENGINE if (prep_alter_part_table(thd, table, alter_info, create_info, old_db_type, &partition_changed, &fast_alter_partition)) goto err; #endif /* If the old table had partitions and we are doing ALTER TABLE ... engine= <new_engine>, the new table must preserve the original partitioning. That means that the new engine is still the partitioning engine, not the engine specified in the parser. This is discovered in prep_alter_part_table, which in such case updates create_info->db_type. Now we need to update the stack copy of create_info->db_type, as otherwise we won't be able to correctly move the files of the temporary table to the result table files. */ new_db_type= create_info->db_type; if (mysql_prepare_alter_table(thd, table, create_info, alter_info)) goto err; need_copy_table= alter_info->change_level; set_table_default_charset(thd, create_info, db); if (thd->variables.old_alter_table || (table->s->db_type() != create_info->db_type) #ifdef WITH_PARTITION_STORAGE_ENGINE || partition_changed #endif ) need_copy_table= ALTER_TABLE_DATA_CHANGED; else { enum_alter_table_change_level need_copy_table_res; /* Check how much the tables differ. */ if (compare_tables(table, alter_info, create_info, order_num, &need_copy_table_res, &key_info_buffer, &index_drop_buffer, &index_drop_count, &index_add_buffer, &index_add_count)) goto err; if (need_copy_table == ALTER_TABLE_METADATA_ONLY) need_copy_table= need_copy_table_res; } /* If there are index changes only, try to do them online. "Index changes only" means also that the handler for the table does not change. The table is open and locked. The handler can be accessed. */ if (need_copy_table == ALTER_TABLE_INDEX_CHANGED) { int pk_changed= 0; ulong alter_flags= 0; ulong needed_online_flags= 0; ulong needed_fast_flags= 0; KEY *key; uint *idx_p; uint *idx_end_p; if (table->s->db_type()->alter_table_flags) alter_flags= table->s->db_type()->alter_table_flags(alter_info->flags); DBUG_PRINT("info", ("alter_flags: %lu", alter_flags)); /* Check dropped indexes. */ for (idx_p= index_drop_buffer, idx_end_p= idx_p + index_drop_count; idx_p < idx_end_p; idx_p++) { key= table->key_info + *idx_p; DBUG_PRINT("info", ("index dropped: '%s'", key->name)); if (key->flags & HA_NOSAME) { /* Unique key. Check for "PRIMARY". */ if (! my_strcasecmp(system_charset_info, key->name, primary_key_name)) { /* Primary key. */ needed_online_flags|= HA_ONLINE_DROP_PK_INDEX; needed_fast_flags|= HA_ONLINE_DROP_PK_INDEX_NO_WRITES; pk_changed++; } else { /* Non-primary unique key. */ needed_online_flags|= HA_ONLINE_DROP_UNIQUE_INDEX; needed_fast_flags|= HA_ONLINE_DROP_UNIQUE_INDEX_NO_WRITES; } } else { /* Non-unique key. */ needed_online_flags|= HA_ONLINE_DROP_INDEX; needed_fast_flags|= HA_ONLINE_DROP_INDEX_NO_WRITES; } } /* Check added indexes. */ for (idx_p= index_add_buffer, idx_end_p= idx_p + index_add_count; idx_p < idx_end_p; idx_p++) { key= key_info_buffer + *idx_p; DBUG_PRINT("info", ("index added: '%s'", key->name)); if (key->flags & HA_NOSAME) { /* Unique key. Check for "PRIMARY". */ if (! my_strcasecmp(system_charset_info, key->name, primary_key_name)) { /* Primary key. */ needed_online_flags|= HA_ONLINE_ADD_PK_INDEX; needed_fast_flags|= HA_ONLINE_ADD_PK_INDEX_NO_WRITES; pk_changed++; } else { /* Non-primary unique key. */ needed_online_flags|= HA_ONLINE_ADD_UNIQUE_INDEX; needed_fast_flags|= HA_ONLINE_ADD_UNIQUE_INDEX_NO_WRITES; } } else { /* Non-unique key. */ needed_online_flags|= HA_ONLINE_ADD_INDEX; needed_fast_flags|= HA_ONLINE_ADD_INDEX_NO_WRITES; } } /* Online or fast add/drop index is possible only if the primary key is not added and dropped in the same statement. Otherwise we have to recreate the table. need_copy_table is no-zero at this place. */ if ( pk_changed < 2 ) { if ((alter_flags & needed_online_flags) == needed_online_flags) { /* All required online flags are present. */ need_copy_table= ALTER_TABLE_METADATA_ONLY; need_lock_for_indexes= FALSE; } else if ((alter_flags & needed_fast_flags) == needed_fast_flags) { /* All required fast flags are present. */ need_copy_table= ALTER_TABLE_METADATA_ONLY; } } DBUG_PRINT("info", ("need_copy_table: %u need_lock: %d", need_copy_table, need_lock_for_indexes)); } /* better have a negative test here, instead of positive, like alter_info->flags & ALTER_ADD_COLUMN|ALTER_ADD_INDEX|... so that ALTER TABLE won't break when somebody will add new flag */ if (need_copy_table == ALTER_TABLE_METADATA_ONLY) create_info->frm_only= 1; #ifdef WITH_PARTITION_STORAGE_ENGINE if (fast_alter_partition) { DBUG_ASSERT(!name_lock); DBUG_RETURN(fast_alter_partition_table(thd, table, alter_info, create_info, table_list, db, table_name, fast_alter_partition)); } #endif my_snprintf(tmp_name, sizeof(tmp_name), "%s-%lx_%lx", tmp_file_prefix, current_pid, thd->thread_id); /* Safety fix for innodb */ if (lower_case_table_names) my_casedn_str(files_charset_info, tmp_name); /* Handling of symlinked tables: If no rename: Create new data file and index file on the same disk as the old data and index files. Copy data. Rename new data file over old data file and new index file over old index file. Symlinks are not changed. If rename: Create new data file and index file on the same disk as the old data and index files. Create also symlinks to point at the new tables. Copy data. At end, rename intermediate tables, and symlinks to intermediate table, to final table name. Remove old table and old symlinks If rename is made to another database: Create new tables in new database. Copy data. Remove old table and symlinks. */ if (!strcmp(db, new_db)) // Ignore symlink if db changed { if (create_info->index_file_name) { /* Fix index_file_name to have 'tmp_name' as basename */ strmov(index_file, tmp_name); create_info->index_file_name=fn_same(index_file, create_info->index_file_name, 1); } if (create_info->data_file_name) { /* Fix data_file_name to have 'tmp_name' as basename */ strmov(data_file, tmp_name); create_info->data_file_name=fn_same(data_file, create_info->data_file_name, 1); } } else create_info->data_file_name=create_info->index_file_name=0; /* Create a table with a temporary name. With create_info->frm_only == 1 this creates a .frm file only. We don't log the statement, it will be logged later. */ tmp_disable_binlog(thd); error= mysql_create_table_no_lock(thd, new_db, tmp_name, create_info, alter_info, 1, 0); reenable_binlog(thd); if (error) goto err; /* Open the table if we need to copy the data. */ if (need_copy_table != ALTER_TABLE_METADATA_ONLY) { if (table->s->tmp_table) { TABLE_LIST tbl; bzero((void*) &tbl, sizeof(tbl)); tbl.db= new_db; tbl.table_name= tbl.alias= tmp_name; /* Table is in thd->temporary_tables */ new_table= open_table(thd, &tbl, thd->mem_root, (bool*) 0, MYSQL_LOCK_IGNORE_FLUSH); } else { char path[FN_REFLEN]; /* table is a normal table: Create temporary table in same directory */ build_table_filename(path, sizeof(path), new_db, tmp_name, "", FN_IS_TMP); /* Open our intermediate table */ new_table=open_temporary_table(thd, path, new_db, tmp_name,0); } if (!new_table) goto err1; } /* Copy the data if necessary. */ thd->count_cuted_fields= CHECK_FIELD_WARN; // calc cuted fields thd->cuted_fields=0L; thd->proc_info="copy to tmp table"; copied=deleted=0; if (new_table && !(new_table->file->ha_table_flags() & HA_NO_COPY_ON_ALTER)) { /* We don't want update TIMESTAMP fields during ALTER TABLE. */ new_table->timestamp_field_type= TIMESTAMP_NO_AUTO_SET; new_table->next_number_field=new_table->found_next_number_field; error= copy_data_between_tables(table, new_table, alter_info->create_list, ignore, order_num, order, &copied, &deleted, alter_info->keys_onoff, alter_info->error_if_not_empty); } else { VOID(pthread_mutex_lock(&LOCK_open)); wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN); VOID(pthread_mutex_unlock(&LOCK_open)); alter_table_manage_keys(table, table->file->indexes_are_disabled(), alter_info->keys_onoff); error= ha_commit_stmt(thd); if (ha_commit(thd)) error= 1; } thd->count_cuted_fields= CHECK_FIELD_IGNORE; /* If we did not need to copy, we might still need to add/drop indexes. */ if (! new_table) { uint *key_numbers; uint *keyno_p; KEY *key_info; KEY *key; uint *idx_p; uint *idx_end_p; KEY_PART_INFO *key_part; KEY_PART_INFO *part_end; DBUG_PRINT("info", ("No new_table, checking add/drop index")); table->file->prepare_for_alter(); if (index_add_count) { /* The add_index() method takes an array of KEY structs. */ key_info= (KEY*) thd->alloc(sizeof(KEY) * index_add_count); key= key_info; for (idx_p= index_add_buffer, idx_end_p= idx_p + index_add_count; idx_p < idx_end_p; idx_p++, key++) { /* Copy the KEY struct. */ *key= key_info_buffer[*idx_p]; /* Fix the key parts. */ part_end= key->key_part + key->key_parts; for (key_part= key->key_part; key_part < part_end; key_part++) key_part->field= table->field[key_part->fieldnr]; } /* Add the indexes. */ if ((error= table->file->add_index(table, key_info, index_add_count))) { /* Exchange the key_info for the error message. If we exchange key number by key name in the message later, we need correct info. */ KEY *save_key_info= table->key_info; table->key_info= key_info; table->file->print_error(error, MYF(0)); table->key_info= save_key_info; goto err1; } } /*end of if (index_add_count)*/ if (index_drop_count) { /* The prepare_drop_index() method takes an array of key numbers. */ key_numbers= (uint*) thd->alloc(sizeof(uint) * index_drop_count); keyno_p= key_numbers; /* Get the number of each key. */ for (idx_p= index_drop_buffer, idx_end_p= idx_p + index_drop_count; idx_p < idx_end_p; idx_p++, keyno_p++) *keyno_p= *idx_p; /* Tell the handler to prepare for drop indexes. This re-numbers the indexes to get rid of gaps. */ if ((error= table->file->prepare_drop_index(table, key_numbers, index_drop_count))) { table->file->print_error(error, MYF(0)); goto err1; } /* Tell the handler to finally drop the indexes. */ if ((error= table->file->final_drop_index(table))) { table->file->print_error(error, MYF(0)); goto err1; } } /*end of if (index_drop_count)*/ /* The final .frm file is already created as a temporary file and will be renamed to the original table name later. */ /* Need to commit before a table is unlocked (NDB requirement). */ DBUG_PRINT("info", ("Committing before unlocking table")); if (ha_commit_stmt(thd) || ha_commit(thd)) goto err1; committed= 1; } /*end of if (! new_table) for add/drop index*/ if (table->s->tmp_table != NO_TMP_TABLE) { /* We changed a temporary table */ if (error) goto err1; /* Close lock if this is a transactional table */ if (thd->lock) { mysql_unlock_tables(thd, thd->lock); thd->lock=0; } /* Remove link to old table and rename the new one */ close_temporary_table(thd, table, 1, 1); /* Should pass the 'new_name' as we store table name in the cache */ if (rename_temporary_table(thd, new_table, new_db, new_name)) goto err1; /* We don't replicate alter table statement on temporary tables */ if (!thd->current_stmt_binlog_row_based) write_bin_log(thd, TRUE, thd->query, thd->query_length); goto end_temporary; } if (new_table) { /* Close the intermediate table that will be the new table */ intern_close_table(new_table); my_free(new_table,MYF(0)); } VOID(pthread_mutex_lock(&LOCK_open)); if (error) { VOID(quick_rm_table(new_db_type, new_db, tmp_name, FN_IS_TMP)); VOID(pthread_mutex_unlock(&LOCK_open)); goto err; } /* Data is copied. Now we: 1) Wait until all other threads close old version of table. 2) Close instances of table open by this thread and replace them with exclusive name-locks. 3) Rename the old table to a temp name, rename the new one to the old name. 4) If we are under LOCK TABLES and don't do ALTER TABLE ... RENAME we reopen new version of table. 5) Write statement to the binary log. 6) If we are under LOCK TABLES and do ALTER TABLE ... RENAME we remove name-locks from list of open tables and table cache. 7) If we are not not under LOCK TABLES we rely on close_thread_tables() call to remove name-locks from table cache and list of open table. */ thd->proc_info="rename result table"; my_snprintf(old_name, sizeof(old_name), "%s2-%lx-%lx", tmp_file_prefix, current_pid, thd->thread_id); if (lower_case_table_names) my_casedn_str(files_charset_info, old_name); wait_while_table_is_used(thd, table, HA_EXTRA_PREPARE_FOR_RENAME); close_data_files_and_morph_locks(thd, db, table_name); error=0; save_old_db_type= old_db_type; /* This leads to the storage engine (SE) not being notified for renames in mysql_rename_table(), because we just juggle with the FRM and nothing more. If we have an intermediate table, then we notify the SE that it should become the actual table. Later, we will recycle the old table. However, in case of ALTER TABLE RENAME there might be no intermediate table. This is when the old and new tables are compatible, according to compare_table(). Then, we need one additional call to mysql_rename_table() with flag NO_FRM_RENAME, which does nothing else but actual rename in the SE and the FRM is not touched. Note that, if the table is renamed and the SE is also changed, then an intermediate table is created and the additional call will not take place. */ if (need_copy_table == ALTER_TABLE_METADATA_ONLY) { DBUG_ASSERT(new_db_type == old_db_type); /* This type cannot happen in regular ALTER. */ new_db_type= old_db_type= NULL; } if (mysql_rename_table(old_db_type, db, table_name, db, old_name, FN_TO_IS_TMP)) { error=1; VOID(quick_rm_table(new_db_type, new_db, tmp_name, FN_IS_TMP)); } else if (mysql_rename_table(new_db_type, new_db, tmp_name, new_db, new_alias, FN_FROM_IS_TMP) || (new_name != table_name || new_db != db) && // we also do rename (need_copy_table != ALTER_TABLE_METADATA_ONLY || mysql_rename_table(save_old_db_type, db, table_name, new_db, new_alias, NO_FRM_RENAME)) && Table_triggers_list::change_table_name(thd, db, table_name, new_db, new_alias)) { /* Try to get everything back. */ error=1; VOID(quick_rm_table(new_db_type,new_db,new_alias, 0)); VOID(quick_rm_table(new_db_type, new_db, tmp_name, FN_IS_TMP)); VOID(mysql_rename_table(old_db_type, db, old_name, db, alias, FN_FROM_IS_TMP)); } if (error) { /* This shouldn't happen. But let us play it safe. */ goto err_with_placeholders; } if (need_copy_table == ALTER_TABLE_METADATA_ONLY) { /* Now we have to inform handler that new .FRM file is in place. To do this we need to obtain a handler object for it. */ TABLE *t_table; if (new_name != table_name || new_db != db) { table_list->alias= new_name; table_list->table_name= new_name; table_list->table_name_length= strlen(new_name); table_list->db= new_db; table_list->db_length= strlen(new_db); table_list->table= name_lock; if (reopen_name_locked_table(thd, table_list, FALSE)) goto err_with_placeholders; t_table= table_list->table; } else { if (reopen_table(table)) goto err_with_placeholders; t_table= table; } /* Tell the handler that a new frm file is in place. */ if (t_table->file->create_handler_files(path, NULL, CHF_INDEX_FLAG, create_info)) goto err_with_placeholders; if (thd->locked_tables && new_name == table_name && new_db == db) { /* We are going to reopen table down on the road, so we have to restore state of the TABLE object which we used for obtaining of handler object to make it suitable for reopening. */ DBUG_ASSERT(t_table == table); table->open_placeholder= 1; close_handle_and_leave_table_as_lock(table); } } VOID(quick_rm_table(old_db_type, db, old_name, FN_IS_TMP)); if (thd->locked_tables && new_name == table_name && new_db == db) { thd->in_lock_tables= 1; error= reopen_tables(thd, 1, 0); thd->in_lock_tables= 0; if (error) goto err_with_placeholders; } VOID(pthread_mutex_unlock(&LOCK_open)); thd->proc_info="end"; DBUG_EXECUTE_IF("sleep_alter_before_main_binlog", my_sleep(6000000);); ha_binlog_log_query(thd, create_info->db_type, LOGCOM_ALTER_TABLE, thd->query, thd->query_length, db, table_name); DBUG_ASSERT(!(mysql_bin_log.is_open() && thd->current_stmt_binlog_row_based && (create_info->options & HA_LEX_CREATE_TMP_TABLE))); write_bin_log(thd, TRUE, thd->query, thd->query_length); if (ha_check_storage_engine_flag(old_db_type, HTON_FLUSH_AFTER_RENAME)) { /* For the alter table to be properly flushed to the logs, we have to open the new table. If not, we get a problem on server shutdown. */ char path[FN_REFLEN]; TABLE *t_table; build_table_filename(path, sizeof(path), new_db, table_name, "", 0); t_table= open_temporary_table(thd, path, new_db, tmp_name, 0); if (t_table) { intern_close_table(t_table); my_free(t_table, MYF(0)); } else sql_print_warning("Could not open table %s.%s after rename\n", new_db,table_name); ha_flush_logs(old_db_type); } table_list->table=0; // For query cache query_cache_invalidate3(thd, table_list, 0); if (thd->locked_tables && (new_name != table_name || new_db != db)) { /* If are we under LOCK TABLES and did ALTER TABLE with RENAME we need to remove placeholders for the old table and for the target table from the list of open tables and table cache. If we are not under LOCK TABLES we can rely on close_thread_tables() doing this job. */ pthread_mutex_lock(&LOCK_open); unlink_open_table(thd, table, FALSE); unlink_open_table(thd, name_lock, FALSE); pthread_mutex_unlock(&LOCK_open); } end_temporary: my_snprintf(tmp_name, sizeof(tmp_name), ER(ER_INSERT_INFO), (ulong) (copied + deleted), (ulong) deleted, (ulong) thd->cuted_fields); send_ok(thd, copied + deleted, 0L, tmp_name); thd->some_tables_deleted=0; DBUG_RETURN(FALSE); err1: if (new_table) { /* close_temporary_table() frees the new_table pointer. */ close_temporary_table(thd, new_table, 1, 1); } else VOID(quick_rm_table(new_db_type, new_db, tmp_name, FN_IS_TMP)); err: /* No default value was provided for a DATE/DATETIME field, the current sql_mode doesn't allow the '0000-00-00' value and the table to be altered isn't empty. Report error here. */ if (alter_info->error_if_not_empty && thd->row_count) { const char *f_val= 0; enum enum_mysql_timestamp_type t_type= MYSQL_TIMESTAMP_DATE; switch (alter_info->datetime_field->sql_type) { case MYSQL_TYPE_DATE: case MYSQL_TYPE_NEWDATE: f_val= "0000-00-00"; t_type= MYSQL_TIMESTAMP_DATE; break; case MYSQL_TYPE_DATETIME: f_val= "0000-00-00 00:00:00"; t_type= MYSQL_TIMESTAMP_DATETIME; break; default: /* Shouldn't get here. */ DBUG_ASSERT(0); } bool save_abort_on_warning= thd->abort_on_warning; thd->abort_on_warning= TRUE; make_truncated_value_warning(thd, MYSQL_ERROR::WARN_LEVEL_ERROR, f_val, strlength(f_val), t_type, alter_info->datetime_field->field_name); thd->abort_on_warning= save_abort_on_warning; } if (name_lock) { pthread_mutex_lock(&LOCK_open); unlink_open_table(thd, name_lock, FALSE); pthread_mutex_unlock(&LOCK_open); } DBUG_RETURN(TRUE); err_with_placeholders: /* An error happened while we were holding exclusive name-lock on table being altered. To be safe under LOCK TABLES we should remove placeholders from list of open tables list and table cache. */ unlink_open_table(thd, table, FALSE); if (name_lock) unlink_open_table(thd, name_lock, FALSE); VOID(pthread_mutex_unlock(&LOCK_open)); DBUG_RETURN(TRUE); } /* mysql_alter_table */ static int copy_data_between_tables(TABLE *from,TABLE *to, List<Create_field> &create, bool ignore, uint order_num, ORDER *order, ha_rows *copied, ha_rows *deleted, enum enum_enable_or_disable keys_onoff, bool error_if_not_empty) { int error; Copy_field *copy,*copy_end; ulong found_count,delete_count; THD *thd= current_thd; uint length= 0; SORT_FIELD *sortorder; READ_RECORD info; TABLE_LIST tables; List<Item> fields; List<Item> all_fields; ha_rows examined_rows; bool auto_increment_field_copied= 0; ulong save_sql_mode; ulonglong prev_insert_id; DBUG_ENTER("copy_data_between_tables"); /* Turn off recovery logging since rollback of an alter table is to delete the new table so there is no need to log the changes to it. This needs to be done before external_lock */ error= ha_enable_transaction(thd, FALSE); if (error) DBUG_RETURN(-1); if (!(copy= new Copy_field[to->s->fields])) DBUG_RETURN(-1); /* purecov: inspected */ if (to->file->ha_external_lock(thd, F_WRLCK)) DBUG_RETURN(-1); /* We need external lock before we can disable/enable keys */ alter_table_manage_keys(to, from->file->indexes_are_disabled(), keys_onoff); /* We can abort alter table for any table type */ thd->abort_on_warning= !ignore && test(thd->variables.sql_mode & (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES)); from->file->info(HA_STATUS_VARIABLE); to->file->ha_start_bulk_insert(from->file->stats.records); save_sql_mode= thd->variables.sql_mode; List_iterator<Create_field> it(create); Create_field *def; copy_end=copy; for (Field **ptr=to->field ; *ptr ; ptr++) { def=it++; if (def->field) { if (*ptr == to->next_number_field) { auto_increment_field_copied= TRUE; /* If we are going to copy contents of one auto_increment column to another auto_increment column it is sensible to preserve zeroes. This condition also covers case when we are don't actually alter auto_increment column. */ if (def->field == from->found_next_number_field) thd->variables.sql_mode|= MODE_NO_AUTO_VALUE_ON_ZERO; } (copy_end++)->set(*ptr,def->field,0); } } found_count=delete_count=0; if (order) { from->sort.io_cache=(IO_CACHE*) my_malloc(sizeof(IO_CACHE), MYF(MY_FAE | MY_ZEROFILL)); bzero((char*) &tables,sizeof(tables)); tables.table= from; tables.alias= tables.table_name= from->s->table_name.str; tables.db= from->s->db.str; error=1; if (thd->lex->select_lex.setup_ref_array(thd, order_num) || setup_order(thd, thd->lex->select_lex.ref_pointer_array, &tables, fields, all_fields, order) || !(sortorder=make_unireg_sortorder(order, &length, NULL)) || (from->sort.found_records = filesort(thd, from, sortorder, length, (SQL_SELECT *) 0, HA_POS_ERROR, 1, &examined_rows)) == HA_POS_ERROR) goto err; }; /* Tell handler that we have values for all columns in the to table */ to->use_all_columns(); init_read_record(&info, thd, from, (SQL_SELECT *) 0, 1,1); if (ignore) to->file->extra(HA_EXTRA_IGNORE_DUP_KEY); thd->row_count= 0; restore_record(to, s->default_values); // Create empty record while (!(error=info.read_record(&info))) { if (thd->killed) { thd->send_kill_message(); error= 1; break; } thd->row_count++; /* Return error if source table isn't empty. */ if (error_if_not_empty) { error= 1; break; } if (to->next_number_field) { if (auto_increment_field_copied) to->auto_increment_field_not_null= TRUE; else to->next_number_field->reset(); } for (Copy_field *copy_ptr=copy ; copy_ptr != copy_end ; copy_ptr++) { copy_ptr->do_copy(copy_ptr); } prev_insert_id= to->file->next_insert_id; error=to->file->write_row(to->record[0]); to->auto_increment_field_not_null= FALSE; if (error) { if (!ignore || to->file->is_fatal_error(error, HA_CHECK_DUP)) { if (!to->file->is_fatal_error(error, HA_CHECK_DUP)) { uint key_nr= to->file->get_dup_key(error); if ((int) key_nr >= 0) { const char *err_msg= ER(ER_DUP_ENTRY_WITH_KEY_NAME); if (key_nr == 0 && (to->key_info[0].key_part[0].field->flags & AUTO_INCREMENT_FLAG)) err_msg= ER(ER_DUP_ENTRY_AUTOINCREMENT_CASE); to->file->print_keydup_error(key_nr, err_msg); break; } } to->file->print_error(error,MYF(0)); break; } to->file->restore_auto_increment(prev_insert_id); delete_count++; } else found_count++; } end_read_record(&info); free_io_cache(from); delete [] copy; // This is never 0 if (to->file->ha_end_bulk_insert() && error <= 0) { to->file->print_error(my_errno,MYF(0)); error=1; } to->file->extra(HA_EXTRA_NO_IGNORE_DUP_KEY); if (ha_enable_transaction(thd, TRUE)) { error= 1; goto err; } /* Ensure that the new table is saved properly to disk so that we can do a rename */ if (ha_commit_stmt(thd)) error=1; if (ha_commit(thd)) error=1; err: thd->variables.sql_mode= save_sql_mode; thd->abort_on_warning= 0; free_io_cache(from); *copied= found_count; *deleted=delete_count; to->file->ha_release_auto_increment(); if (to->file->ha_external_lock(thd,F_UNLCK)) error=1; DBUG_RETURN(error > 0 ? -1 : 0); } /* Recreates tables by calling mysql_alter_table(). SYNOPSIS mysql_recreate_table() thd Thread handler tables Tables to recreate RETURN Like mysql_alter_table(). */ bool mysql_recreate_table(THD *thd, TABLE_LIST *table_list) { HA_CREATE_INFO create_info; Alter_info alter_info; DBUG_ENTER("mysql_recreate_table"); bzero((char*) &create_info, sizeof(create_info)); create_info.row_type=ROW_TYPE_NOT_USED; create_info.default_table_charset=default_charset_info; /* Force alter table to recreate table */ alter_info.flags= (ALTER_CHANGE_COLUMN | ALTER_RECREATE); DBUG_RETURN(mysql_alter_table(thd, NullS, NullS, &create_info, table_list, &alter_info, 0, (ORDER *) 0, 0)); } bool mysql_checksum_table(THD *thd, TABLE_LIST *tables, HA_CHECK_OPT *check_opt) { TABLE_LIST *table; List<Item> field_list; Item *item; Protocol *protocol= thd->protocol; DBUG_ENTER("mysql_checksum_table"); field_list.push_back(item = new Item_empty_string("Table", NAME_LEN*2)); item->maybe_null= 1; field_list.push_back(item= new Item_int("Checksum", (longlong) 1, MY_INT64_NUM_DECIMAL_DIGITS)); item->maybe_null= 1; if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF)) DBUG_RETURN(TRUE); for (table= tables; table; table= table->next_local) { char table_name[NAME_LEN*2+2]; TABLE *t; strxmov(table_name, table->db ,".", table->table_name, NullS); t= table->table= open_ltable(thd, table, TL_READ, 0); thd->clear_error(); // these errors shouldn't get client protocol->prepare_for_resend(); protocol->store(table_name, system_charset_info); if (!t) { /* Table didn't exist */ protocol->store_null(); thd->clear_error(); } else { if (t->file->ha_table_flags() & HA_HAS_CHECKSUM && !(check_opt->flags & T_EXTEND)) protocol->store((ulonglong)t->file->checksum()); else if (!(t->file->ha_table_flags() & HA_HAS_CHECKSUM) && (check_opt->flags & T_QUICK)) protocol->store_null(); else { /* calculating table's checksum */ ha_checksum crc= 0; uchar null_mask=256 - (1 << t->s->last_null_bit_pos); t->use_all_columns(); if (t->file->ha_rnd_init(1)) protocol->store_null(); else { for (;;) { ha_checksum row_crc= 0; int error= t->file->rnd_next(t->record[0]); if (unlikely(error)) { if (error == HA_ERR_RECORD_DELETED) continue; break; } if (t->s->null_bytes) { /* fix undefined null bits */ t->record[0][t->s->null_bytes-1] |= null_mask; if (!(t->s->db_create_options & HA_OPTION_PACK_RECORD)) t->record[0][0] |= 1; row_crc= my_checksum(row_crc, t->record[0], t->s->null_bytes); } for (uint i= 0; i < t->s->fields; i++ ) { Field *f= t->field[i]; if (! thd->variables.old_mode && f->is_real_null(0)) continue; if ((f->type() == MYSQL_TYPE_BLOB) || (f->type() == MYSQL_TYPE_VARCHAR)) { String tmp; f->val_str(&tmp); row_crc= my_checksum(row_crc, (uchar*) tmp.ptr(), tmp.length()); } else row_crc= my_checksum(row_crc, f->ptr, f->pack_length()); } crc+= row_crc; } protocol->store((ulonglong)crc); t->file->ha_rnd_end(); } } thd->clear_error(); close_thread_tables(thd); table->table=0; // For query cache } if (protocol->write()) goto err; } send_eof(thd); DBUG_RETURN(FALSE); err: close_thread_tables(thd); // Shouldn't be needed if (table) table->table=0; DBUG_RETURN(TRUE); } static bool check_engine(THD *thd, const char *table_name, HA_CREATE_INFO *create_info) { handlerton **new_engine= &create_info->db_type; handlerton *req_engine= *new_engine; bool no_substitution= test(thd->variables.sql_mode & MODE_NO_ENGINE_SUBSTITUTION); if (!(*new_engine= ha_checktype(thd, ha_legacy_type(req_engine), no_substitution, 1))) return TRUE; if (req_engine && req_engine != *new_engine) { push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE, ER_WARN_USING_OTHER_HANDLER, ER(ER_WARN_USING_OTHER_HANDLER), ha_resolve_storage_engine_name(*new_engine), table_name); } if (create_info->options & HA_LEX_CREATE_TMP_TABLE && ha_check_storage_engine_flag(*new_engine, HTON_TEMPORARY_NOT_SUPPORTED)) { if (create_info->used_fields & HA_CREATE_USED_ENGINE) { my_error(ER_ILLEGAL_HA_CREATE_OPTION, MYF(0), ha_resolve_storage_engine_name(*new_engine), "TEMPORARY"); *new_engine= 0; return TRUE; } *new_engine= myisam_hton; } return FALSE; }