/* Copyright (C) 2000 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; either version 2 of the License, or (at your option) any later version. 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 */ /* Delete of records and truncate of tables. Multi-table deletes were introduced by Monty and Sinisa */ #include "mysql_priv.h" #include "ha_innodb.h" #include "sql_select.h" int mysql_delete(THD *thd, TABLE_LIST *table_list, COND *conds, ORDER *order, ha_rows limit, ulong options) { int error; TABLE *table; SQL_SELECT *select=0; READ_RECORD info; bool using_limit=limit != HA_POS_ERROR; bool transactional_table, log_delayed, safe_update; ha_rows deleted; DBUG_ENTER("mysql_delete"); if (((safe_update=thd->options & OPTION_SAFE_UPDATES)) && !conds) { send_error(&thd->net,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE); DBUG_RETURN(1); } if (!(table = open_ltable(thd, table_list, table_list->lock_type))) DBUG_RETURN(-1); table->file->info(HA_STATUS_VARIABLE | HA_STATUS_NO_LOCK); thd->proc_info="init"; table->map=1; if (setup_conds(thd,table_list,&conds) || setup_ftfuncs(thd)) DBUG_RETURN(-1); /* Test if the user wants to delete all rows */ if (!using_limit && (!conds || conds->const_item()) && !(specialflag & (SPECIAL_NO_NEW_FUNC | SPECIAL_SAFE_MODE)) && !safe_update) { deleted= table->file->records; if (!(error=table->file->delete_all_rows())) { error= -1; // ok goto cleanup; } if (error != HA_ERR_WRONG_COMMAND) { table->file->print_error(error,MYF(0)); error=0; goto cleanup; } /* Handler didn't support fast delete; Delete rows one by one */ } table->used_keys=table->quick_keys=0; // Can't use 'only index' select=make_select(table,0,0,conds,&error); if (error) DBUG_RETURN(-1); if ((select && select->check_quick(test(thd->options & OPTION_SAFE_UPDATES), limit)) || !limit) { delete select; send_ok(&thd->net,0L); DBUG_RETURN(0); // Nothing to delete } /* If running in safe sql mode, don't allow updates without keys */ if (!table->quick_keys) { thd->lex.select_lex.options|=QUERY_NO_INDEX_USED; if (safe_update && !using_limit) { delete select; send_error(&thd->net,ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE); DBUG_RETURN(1); } } if (options & OPTION_QUICK) (void) table->file->extra(HA_EXTRA_QUICK); if (order) { uint length; SORT_FIELD *sortorder; TABLE_LIST tables; List<Item> fields; List<Item> all_fields; ha_rows examined_rows; bzero((char*) &tables,sizeof(tables)); tables.table = table; table->io_cache = (IO_CACHE *) my_malloc(sizeof(IO_CACHE), MYF(MY_FAE | MY_ZEROFILL)); if (setup_order(thd, &tables, fields, all_fields, order) || !(sortorder=make_unireg_sortorder(order, &length)) || (table->found_records = filesort(table, sortorder, length, (SQL_SELECT *) 0, 0L, HA_POS_ERROR, &examined_rows)) == HA_POS_ERROR) { delete select; DBUG_RETURN(-1); // This will force out message } } init_read_record(&info,thd,table,select,1,1); deleted=0L; init_ftfuncs(thd,1); thd->proc_info="updating"; while (!(error=info.read_record(&info)) && !thd->killed) { if (!(select && select->skipp_record())) { if (!(error=table->file->delete_row(table->record[0]))) { deleted++; if (!--limit && using_limit) { error= -1; break; } } else { table->file->print_error(error,MYF(0)); error=0; break; } } else table->file->unlock_row(); // Row failed selection, release lock on it } thd->proc_info="end"; end_read_record(&info); free_io_cache(table); // Will not do any harm if (options & OPTION_QUICK) (void) table->file->extra(HA_EXTRA_NORMAL); cleanup: transactional_table= table->file->has_transactions(); log_delayed= (transactional_table || table->tmp_table); if (deleted && (error <= 0 || !transactional_table)) { mysql_update_log.write(thd,thd->query, thd->query_length); if (mysql_bin_log.is_open()) { Query_log_event qinfo(thd, thd->query, thd->query_length, log_delayed); if (mysql_bin_log.write(&qinfo) && transactional_table) error=1; } if (!log_delayed) thd->options|=OPTION_STATUS_NO_TRANS_UPDATE; } if (transactional_table) { if (ha_autocommit_or_rollback(thd,error >= 0)) error=1; } /* Store table for future invalidation or invalidate it in the query cache if something changed */ if (deleted) { query_cache_invalidate3(thd, table_list, 1); } if (thd->lock) { mysql_unlock_tables(thd, thd->lock); thd->lock=0; } delete select; if (error >= 0) // Fatal error send_error(&thd->net,thd->killed ? ER_SERVER_SHUTDOWN: 0); else { send_ok(&thd->net,deleted); DBUG_PRINT("info",("%d records deleted",deleted)); } DBUG_RETURN(0); } /*************************************************************************** Delete multiple tables from join ***************************************************************************/ #define MEM_STRIP_BUF_SIZE current_thd->variables.sortbuff_size extern "C" int refposcmp2(void* arg, const void *a,const void *b) { return memcmp(a,b, *(int*) arg); } multi_delete::multi_delete(THD *thd_arg, TABLE_LIST *dt, uint num_of_tables_arg) : delete_tables (dt), thd(thd_arg), deleted(0), num_of_tables(num_of_tables_arg), error(0), do_delete(0), transactional_tables(0), log_delayed(0), normal_tables(0) { tempfiles = (Unique **) sql_calloc(sizeof(Unique *) * (num_of_tables-1)); } int multi_delete::prepare(List<Item> &values) { DBUG_ENTER("multi_delete::prepare"); do_delete = true; thd->proc_info="deleting from main table"; if (thd->options & OPTION_SAFE_UPDATES) { TABLE_LIST *table_ref; for (table_ref=delete_tables; table_ref; table_ref=table_ref->next) { TABLE *table=table_ref->table; if ((thd->options & OPTION_SAFE_UPDATES) && !table->quick_keys) { my_error(ER_UPDATE_WITHOUT_KEY_IN_SAFE_MODE,MYF(0)); DBUG_RETURN(1); } } } DBUG_RETURN(0); } void multi_delete::initialize_tables(JOIN *join) { int counter=0; TABLE_LIST *walk; table_map tables_to_delete_from=0; for (walk= delete_tables ; walk ; walk=walk->next) tables_to_delete_from|= walk->table->map; walk= delete_tables; for (JOIN_TAB *tab=join->join_tab, *end=join->join_tab+join->tables; tab < end; tab++) { if (tab->table->map & tables_to_delete_from) { /* We are going to delete from this table */ TABLE *tbl=walk->table=tab->table; /* Don't use KEYREAD optimization on this table */ tbl->no_keyread=1; walk=walk->next; if (tbl->file->has_transactions()) log_delayed= transactional_tables= 1; else if (tbl->tmp_table != NO_TMP_TABLE) log_delayed= 1; else normal_tables= 1; } } walk= delete_tables; walk->table->used_keys=0; for (walk=walk->next ; walk ; walk=walk->next, counter++) { tables_to_delete_from|= walk->table->map; TABLE *table=walk->table; /* Don't use key read with MULTI-TABLE-DELETE */ table->used_keys=0; tempfiles[counter] = new Unique (refposcmp2, (void *) &table->file->ref_length, table->file->ref_length, MEM_STRIP_BUF_SIZE); } init_ftfuncs(thd,1); } multi_delete::~multi_delete() { for (table_being_deleted=delete_tables ; table_being_deleted ; table_being_deleted=table_being_deleted->next) { TABLE *t=table_being_deleted->table; free_io_cache(t); // Alloced by unique t->no_keyread=0; } for (uint counter = 0; counter < num_of_tables-1; counter++) { if (tempfiles[counter]) delete tempfiles[counter]; } } bool multi_delete::send_data(List<Item> &values) { int secure_counter= -1; DBUG_ENTER("multi_delete::send_data"); for (table_being_deleted=delete_tables ; table_being_deleted ; table_being_deleted=table_being_deleted->next, secure_counter++) { TABLE *table=table_being_deleted->table; /* Check if we are using outer join and we didn't find the row */ if (table->status & (STATUS_NULL_ROW | STATUS_DELETED)) continue; table->file->position(table->record[0]); if (secure_counter < 0) { /* If this is the table we are scanning */ table->status|= STATUS_DELETED; if (!(error=table->file->delete_row(table->record[0]))) deleted++; else if (!table_being_deleted->next) { table->file->print_error(error,MYF(0)); DBUG_RETURN(1); } } else { error=tempfiles[secure_counter]->unique_add((char*) table->file->ref); if (error) { error=-1; DBUG_RETURN(1); } } } DBUG_RETURN(0); } void multi_delete::send_error(uint errcode,const char *err) { DBUG_ENTER("multi_delete::send_error"); /* First send error what ever it is ... */ ::send_error(&thd->net,errcode,err); /* If nothing deleted return */ if (!deleted) DBUG_VOID_RETURN; /* Something already deleted so we have to invalidate cache */ query_cache_invalidate3(thd, delete_tables, 1); /* Below can happen when thread is killed early ... */ if (!table_being_deleted) table_being_deleted=delete_tables; /* If rows from the first table only has been deleted and it is transactional, just do rollback. The same if all tables are transactional, regardless of where we are. In all other cases do attempt deletes ... */ if ((table_being_deleted->table->file->has_transactions() && table_being_deleted == delete_tables) || !normal_tables) ha_rollback_stmt(thd); else if (do_delete) { VOID(do_deletes(1)); } DBUG_VOID_RETURN; } /* Do delete from other tables. Returns values: 0 ok 1 error */ int multi_delete::do_deletes(bool from_send_error) { int local_error= 0, counter= 0; if (from_send_error) { /* Found out table number for 'table_being_deleted' */ for (TABLE_LIST *aux=delete_tables; aux != table_being_deleted; aux=aux->next) counter++; } else table_being_deleted = delete_tables; do_delete = false; for (table_being_deleted=table_being_deleted->next; table_being_deleted ; table_being_deleted=table_being_deleted->next, counter++) { TABLE *table = table_being_deleted->table; if (tempfiles[counter]->get(table)) { local_error=1; break; } READ_RECORD info; init_read_record(&info,thd,table,NULL,0,0); while (!(local_error=info.read_record(&info)) && !thd->killed) { if ((local_error=table->file->delete_row(table->record[0]))) { table->file->print_error(local_error,MYF(0)); break; } deleted++; } end_read_record(&info); if (local_error == -1) // End of file local_error = 0; } return local_error; } /* Send ok to the client return: 0 sucess 1 error */ bool multi_delete::send_eof() { thd->proc_info="deleting from reference tables"; /* Does deletes for the last n - 1 tables, returns 0 if ok */ int local_error= do_deletes(0); // returns 0 if success /* reset used flags */ thd->proc_info="end"; /* Write the SQL statement to the binlog if we deleted rows and we succeeded, or also in an error case when there was a non-transaction-safe table involved, since modifications in it cannot be rolled back. */ if (deleted) { mysql_update_log.write(thd,thd->query,thd->query_length); if (mysql_bin_log.is_open()) { Query_log_event qinfo(thd, thd->query, thd->query_length, log_delayed); if (mysql_bin_log.write(&qinfo) && !normal_tables) local_error=1; // Log write failed: roll back the SQL statement } /* Commit or rollback the current SQL statement */ VOID(ha_autocommit_or_rollback(thd,local_error > 0)); query_cache_invalidate3(thd, delete_tables, 1); } if (local_error) ::send_error(&thd->net); else ::send_ok(&thd->net,deleted); return 0; } /*************************************************************************** TRUNCATE TABLE ****************************************************************************/ /* Optimize delete of all rows by doing a full generate of the table This will work even if the .ISM and .ISD tables are destroyed dont_send_ok should be set if: - We should always wants to generate the table (even if the table type normally can't safely do this. - We don't want an ok to be sent to the end user. - We don't want to log the truncate command - If we want to have a name lock on the table on exit without errors. */ int mysql_truncate(THD *thd, TABLE_LIST *table_list, bool dont_send_ok) { HA_CREATE_INFO create_info; char path[FN_REFLEN]; TABLE **table_ptr; int error; DBUG_ENTER("mysql_truncate"); /* If it is a temporary table, close and regenerate it */ if (!dont_send_ok && (table_ptr=find_temporary_table(thd,table_list->db, table_list->real_name))) { TABLE *table= *table_ptr; HA_CREATE_INFO create_info; table->file->info(HA_STATUS_AUTO | HA_STATUS_NO_LOCK); bzero((char*) &create_info,sizeof(create_info)); create_info.auto_increment_value= table->file->auto_increment_value; db_type table_type=table->db_type; strmov(path,table->path); *table_ptr= table->next; // Unlink table from list close_temporary(table,0); *fn_ext(path)=0; // Remove the .frm extension ha_create_table(path, &create_info,1); // We don't need to call invalidate() because this table is not in cache if ((error= (int) !(open_temporary_table(thd, path, table_list->db, table_list->real_name, 1)))) (void) rm_temporary_table(table_type, path); /* Sasha: if we return here we will not have binloged the truncation and we will not send_ok() to the client. */ goto end; } (void) sprintf(path,"%s/%s/%s%s",mysql_data_home,table_list->db, table_list->real_name,reg_ext); fn_format(path,path,"","",4); if (!dont_send_ok) { db_type table_type; if ((table_type=get_table_type(path)) == DB_TYPE_UNKNOWN) { my_error(ER_NO_SUCH_TABLE, MYF(0), table_list->db, table_list->real_name); DBUG_RETURN(-1); } if (!ha_supports_generate(table_type)) { /* Probably InnoDB table */ table_list->lock_type= TL_WRITE; DBUG_RETURN(mysql_delete(thd, table_list, (COND*) 0, (ORDER*) 0, HA_POS_ERROR, 0)); } if (lock_and_wait_for_table_name(thd, table_list)) DBUG_RETURN(-1); } bzero((char*) &create_info,sizeof(create_info)); *fn_ext(path)=0; // Remove the .frm extension error= ha_create_table(path,&create_info,1) ? -1 : 0; query_cache_invalidate3(thd, table_list, 0); end: if (!dont_send_ok) { if (!error) { mysql_update_log.write(thd,thd->query,thd->query_length); if (mysql_bin_log.is_open()) { Query_log_event qinfo(thd, thd->query, thd->query_length, thd->tmp_table); mysql_bin_log.write(&qinfo); } send_ok(&thd->net); // This should return record count } VOID(pthread_mutex_lock(&LOCK_open)); unlock_table_name(thd, table_list); VOID(pthread_mutex_unlock(&LOCK_open)); } else if (error) { VOID(pthread_mutex_lock(&LOCK_open)); unlock_table_name(thd, table_list); VOID(pthread_mutex_unlock(&LOCK_open)); } DBUG_RETURN(error ? -1 : 0); }