sql_prepare.cc 54.4 KB
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/* Copyright (C) 1995-2002 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
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   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA */
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/**********************************************************************
This file contains the implementation of prepare and executes. 

Prepare:

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  - Server gets the query from client with command 'COM_PREPARE'; 
    in the following format:
    [COM_PREPARE:1] [query]
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  - Parse the query and recognize any parameter markers '?' and 
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    store its information list in lex->param_list
  - Allocate a new statement for this prepare; and keep this in 
    'thd->prepared_statements' pool.
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  - Without executing the query, return back to client the total 
    number of parameters along with result-set metadata information
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    (if any) in the following format:
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    [STMT_ID:4]
    [Column_count:2]
    [Param_count:2]
    [Columns meta info] (if Column_count > 0)
    [Params meta info]  (if Param_count > 0 ) (TODO : 4.1.1)
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Prepare-execute:

  - Server gets the command 'COM_EXECUTE' to execute the 
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    previously prepared query. If there is any param markers; then client
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    will send the data in the following format:
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    [COM_EXECUTE:1]
    [STMT_ID:4]
    [NULL_BITS:(param_count+7)/8)]
    [TYPES_SUPPLIED_BY_CLIENT(0/1):1]
    [[length]data]
    [[length]data] .. [[length]data]. 
    (Note: Except for string/binary types; all other types will not be 
    supplied with length field)
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  - Replace the param items with this new data. If it is a first execute 
    or types altered by client; then setup the conversion routines.
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  - Execute the query without re-parsing and send back the results 
    to client

Long data handling:
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  - Server gets the long data in pieces with command type 'COM_LONG_DATA'.
  - The packet recieved will have the format as:
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    [COM_LONG_DATA:1][STMT_ID:4][parameter_number:2][data]
  - data from the packet is appended to long data value buffer for this
    placeholder.
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  - It's up to the client to check for read data ended. The server doesn't
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    care; and also server doesn't notify to the client that it got the 
    data or not; if there is any error; then during execute; the error 
    will be returned
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***********************************************************************/

#include "mysql_priv.h"
#include "sql_acl.h"
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#include "sql_select.h" // for JOIN
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#include <m_ctype.h>  // for isspace()
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#ifdef EMBEDDED_LIBRARY
/* include MYSQL_BIND headers */
#include <mysql.h>
#endif
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/******************************************************************************
  Prepared_statement: statement which can contain placeholders
******************************************************************************/
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class Prepared_statement: public Statement
{
public:
  THD *thd;
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  Item_param **param_array;
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  uint param_count;
  uint last_errno;
  char last_error[MYSQL_ERRMSG_SIZE];
#ifndef EMBEDDED_LIBRARY
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  bool (*set_params)(Prepared_statement *st, uchar *data, uchar *data_end,
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                     uchar *read_pos, String *expanded_query);
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#else
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  bool (*set_params_data)(Prepared_statement *st, String *expanded_query);
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#endif
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  bool (*set_params_from_vars)(Prepared_statement *stmt, 
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                               List<LEX_STRING>& varnames,
                               String *expanded_query);
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public:
  Prepared_statement(THD *thd_arg);
  virtual ~Prepared_statement();
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  void setup_set_params();
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  virtual Item_arena::Type type() const;
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};
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static void execute_stmt(THD *thd, Prepared_statement *stmt,
                         String *expanded_query, bool set_context);
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/******************************************************************************
  Implementation
******************************************************************************/
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inline bool is_param_null(const uchar *pos, ulong param_no)
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{
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  return pos[param_no/8] & (1 << (param_no & 7));
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}

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enum { STMT_QUERY_LOG_LENGTH= 8192 };
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enum enum_send_error { DONT_SEND_ERROR= 0, SEND_ERROR };
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/*
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  Seek prepared statement in statement map by id: returns zero if statement
  was not found, pointer otherwise.
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*/

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static Prepared_statement *
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find_prepared_statement(THD *thd, ulong id, const char *where,
                        enum enum_send_error se)
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{
  Statement *stmt= thd->stmt_map.find(id);

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  if (stmt == 0 || stmt->type() != (int)Item_arena::PREPARED_STATEMENT)
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  {
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    char llbuf[22];
    my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0), 22, llstr(id, llbuf), where);
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    if (se == SEND_ERROR)
      send_error(thd);
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    return 0;
  }
  return (Prepared_statement *) stmt;
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}

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/*
  Send prepared stmt info to client after prepare
*/

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#ifndef EMBEDDED_LIBRARY
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static bool send_prep_stmt(Prepared_statement *stmt, uint columns)
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{
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  NET *net= &stmt->thd->net;
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  char buff[9];
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  buff[0]= 0;                                   /* OK packet indicator */
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  int4store(buff+1, stmt->id);
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  int2store(buff+5, columns);
  int2store(buff+7, stmt->param_count);
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  /*
    Send types and names of placeholders to the client
    XXX: fix this nasty upcast from List<Item_param> to List<Item>
  */
  return my_net_write(net, buff, sizeof(buff)) || 
         (stmt->param_count &&
          stmt->thd->protocol_simple.send_fields((List<Item> *)
                                                 &stmt->lex->param_list, 0)) ||
         net_flush(net);
  return 0;
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}
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#else
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static bool send_prep_stmt(Prepared_statement *stmt,
                           uint columns __attribute__((unused)))
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{
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  THD *thd= stmt->thd;

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  thd->client_stmt_id= stmt->id;
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  thd->client_param_count= stmt->param_count;
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  thd->net.last_errno= 0;
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  return 0;
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}
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#endif /*!EMBEDDED_LIBRARY*/
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/*
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  Read the length of the parameter data and return back to
  caller by positing the pointer to param data.
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*/

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#ifndef EMBEDDED_LIBRARY
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static ulong get_param_length(uchar **packet, ulong len)
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{
  reg1 uchar *pos= *packet;
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  if (len < 1)
    return 0;
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  if (*pos < 251)
  {
    (*packet)++;
    return (ulong) *pos;
  }
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  if (len < 3)
    return 0;
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  if (*pos == 252)
  {
    (*packet)+=3;
    return (ulong) uint2korr(pos+1);
  }
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  if (len < 4)
    return 0;
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  if (*pos == 253)
  {
    (*packet)+=4;
    return (ulong) uint3korr(pos+1);
  }
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  if (len < 5)
    return 0;
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  (*packet)+=9; // Must be 254 when here 
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  /*
    In our client-server protocol all numbers bigger than 2^24
    stored as 8 bytes with uint8korr. Here we always know that
    parameter length is less than 2^4 so don't look at the second
    4 bytes. But still we need to obey the protocol hence 9 in the
    assignment above.
  */
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  return (ulong) uint4korr(pos+1);
}
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#else
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#define get_param_length(packet, len) len
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#endif /*!EMBEDDED_LIBRARY*/

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 /*
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   Data conversion routines
   SYNOPSIS
   set_param_xx()
    param   parameter item
    pos     input data buffer
    len     length of data in the buffer
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  All these functions read the data from pos, convert it to requested type 
  and assign to param; pos is advanced to predefined length.
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  Make a note that the NULL handling is examined at first execution
  (i.e. when input types altered) and for all subsequent executions
  we don't read any values for this.

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  RETURN VALUE
    none
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*/

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static void set_param_tiny(Item_param *param, uchar **pos, ulong len)
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{
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#ifndef EMBEDDED_LIBRARY
  if (len < 1)
    return;
#endif
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  int8 value= (int8) **pos;
  param->set_int(param->unsigned_flag ? (longlong) ((uint8) value) : 
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                                        (longlong) value, 4);
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  *pos+= 1;
}

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static void set_param_short(Item_param *param, uchar **pos, ulong len)
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{
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  int16 value;
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#ifndef EMBEDDED_LIBRARY
  if (len < 2)
    return;
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  value= sint2korr(*pos);
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#else
  shortget(value, *pos);
#endif
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  param->set_int(param->unsigned_flag ? (longlong) ((uint16) value) :
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                                        (longlong) value, 6);
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  *pos+= 2;
}

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static void set_param_int32(Item_param *param, uchar **pos, ulong len)
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{
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  int32 value;
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#ifndef EMBEDDED_LIBRARY
  if (len < 4)
    return;
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  value= sint4korr(*pos);
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#else
  longget(value, *pos);
#endif
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  param->set_int(param->unsigned_flag ? (longlong) ((uint32) value) :
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                                        (longlong) value, 11);
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  *pos+= 4;
}

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static void set_param_int64(Item_param *param, uchar **pos, ulong len)
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{
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  longlong value;
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#ifndef EMBEDDED_LIBRARY
  if (len < 8)
    return;
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  value= (longlong) sint8korr(*pos);
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#else
  longlongget(value, *pos);
#endif
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  param->set_int(value, 21);
  *pos+= 8;
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}

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static void set_param_float(Item_param *param, uchar **pos, ulong len)
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{
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#ifndef EMBEDDED_LIBRARY
  if (len < 4)
    return;
#endif
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  float data;
  float4get(data,*pos);
  param->set_double((double) data);
  *pos+= 4;
}

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static void set_param_double(Item_param *param, uchar **pos, ulong len)
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{
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#ifndef EMBEDDED_LIBRARY
  if (len < 8)
    return;
#endif
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  double data;
  float8get(data,*pos);
  param->set_double((double) data);
  *pos+= 8;
}

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#ifndef EMBEDDED_LIBRARY
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static void set_param_time(Item_param *param, uchar **pos, ulong len)
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{
  ulong length;
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  uint day;
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  if ((length= get_param_length(pos, len)) >= 8)
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  {
    uchar *to= *pos;
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    TIME  tm;
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    tm.neg= (bool) to[0];
    day= (uint) sint4korr(to+1);
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    /*
      Note, that though ranges of hour, minute and second are not checked
      here we rely on them being < 256: otherwise
      we'll get buffer overflow in make_{date,time} functions,
      which are called when time value is converted to string.
    */
    tm.hour=   (uint) to[5] + day * 24;
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    tm.minute= (uint) to[6];
    tm.second= (uint) to[7];
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    tm.second_part= (length > 8) ? (ulong) sint4korr(to+8) : 0;
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    if (tm.hour > 838)
    {
      /* TODO: add warning 'Data truncated' here */
      tm.hour= 838;
      tm.minute= 59;
      tm.second= 59;
    }
    tm.day= tm.year= tm.month= 0;
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    param->set_time(&tm, MYSQL_TIMESTAMP_TIME,
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                    MAX_TIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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  }
  *pos+= length;
}

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static void set_param_datetime(Item_param *param, uchar **pos, ulong len)
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{
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  uint length;
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  if ((length= get_param_length(pos, len)) >= 4)
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  {
    uchar *to= *pos;
    TIME  tm;
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    tm.neg=    0;
    tm.year=   (uint) sint2korr(to);
    tm.month=  (uint) to[2];
    tm.day=    (uint) to[3];
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    /*
      Note, that though ranges of hour, minute and second are not checked
      here we rely on them being < 256: otherwise
      we'll get buffer overflow in make_{date,time} functions.
    */
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    if (length > 4)
    {
      tm.hour=   (uint) to[4];
      tm.minute= (uint) to[5];
      tm.second= (uint) to[6];
    }
    else
      tm.hour= tm.minute= tm.second= 0;
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    tm.second_part= (length > 7) ? (ulong) sint4korr(to+7) : 0;
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    param->set_time(&tm, MYSQL_TIMESTAMP_DATETIME, 
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                    MAX_DATETIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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  }
  *pos+= length;
}

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static void set_param_date(Item_param *param, uchar **pos, ulong len)
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{
  ulong length;
 
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  if ((length= get_param_length(pos, len)) >= 4)
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  {
    uchar *to= *pos;
    TIME tm;
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    /*
      Note, that though ranges of hour, minute and second are not checked
      here we rely on them being < 256: otherwise
      we'll get buffer overflow in make_{date,time} functions.
    */
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    tm.year=  (uint) sint2korr(to);
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    tm.month=  (uint) to[2];
    tm.day= (uint) to[3];

    tm.hour= tm.minute= tm.second= 0;
    tm.second_part= 0;
    tm.neg= 0;

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    param->set_time(&tm, MYSQL_TIMESTAMP_DATE,
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                    MAX_DATE_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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  }
  *pos+= length;
}

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#else/*!EMBEDDED_LIBRARY*/
void set_param_time(Item_param *param, uchar **pos, ulong len)
{
  MYSQL_TIME *to= (MYSQL_TIME*)*pos;
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  param->set_time(to, MYSQL_TIMESTAMP_TIME,
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                  MAX_TIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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}

void set_param_datetime(Item_param *param, uchar **pos, ulong len)
{
  MYSQL_TIME *to= (MYSQL_TIME*)*pos;

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  param->set_time(to, MYSQL_TIMESTAMP_DATETIME,
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                  MAX_DATETIME_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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}

void set_param_date(Item_param *param, uchar **pos, ulong len)
{
  MYSQL_TIME *to= (MYSQL_TIME*)*pos;
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  param->set_time(to, MYSQL_TIMESTAMP_DATE,
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                  MAX_DATE_WIDTH * MY_CHARSET_BIN_MB_MAXLEN);
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}
#endif /*!EMBEDDED_LIBRARY*/

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static void set_param_str(Item_param *param, uchar **pos, ulong len)
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{
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  ulong length= get_param_length(pos, len);
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  param->set_str((const char *)*pos, length);
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  *pos+= length;
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}

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#undef get_param_length 

static void setup_one_conversion_function(THD *thd, Item_param *param,
                                          uchar param_type)
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{
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  switch (param_type) {
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  case MYSQL_TYPE_TINY:
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    param->set_param_func= set_param_tiny;
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    param->item_type= Item::INT_ITEM;
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    param->item_result_type= INT_RESULT;
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    break;
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  case MYSQL_TYPE_SHORT:
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    param->set_param_func= set_param_short;
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    param->item_type= Item::INT_ITEM;
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    param->item_result_type= INT_RESULT;
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    break;
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  case MYSQL_TYPE_LONG:
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    param->set_param_func= set_param_int32;
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    param->item_type= Item::INT_ITEM;
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    param->item_result_type= INT_RESULT;
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    break;
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  case MYSQL_TYPE_LONGLONG:
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    param->set_param_func= set_param_int64;
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    param->item_type= Item::INT_ITEM;
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    param->item_result_type= INT_RESULT;
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    break;
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  case MYSQL_TYPE_FLOAT:
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    param->set_param_func= set_param_float;
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    param->item_type= Item::REAL_ITEM;
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    param->item_result_type= REAL_RESULT;
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    break;
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  case MYSQL_TYPE_DOUBLE:
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    param->set_param_func= set_param_double;
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    param->item_type= Item::REAL_ITEM;
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    param->item_result_type= REAL_RESULT;
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    break;
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  case MYSQL_TYPE_TIME:
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    param->set_param_func= set_param_time;
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    param->item_type= Item::STRING_ITEM;
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    param->item_result_type= STRING_RESULT;
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    break;
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  case MYSQL_TYPE_DATE:
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    param->set_param_func= set_param_date;
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    param->item_type= Item::STRING_ITEM;
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    param->item_result_type= STRING_RESULT;
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    break;
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  case MYSQL_TYPE_DATETIME:
  case MYSQL_TYPE_TIMESTAMP:
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    param->set_param_func= set_param_datetime;
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    param->item_type= Item::STRING_ITEM;
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    param->item_result_type= STRING_RESULT;
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    break;
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  case MYSQL_TYPE_TINY_BLOB:
  case MYSQL_TYPE_MEDIUM_BLOB:
  case MYSQL_TYPE_LONG_BLOB:
  case MYSQL_TYPE_BLOB:
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    param->set_param_func= set_param_str;
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    param->value.cs_info.character_set_client= &my_charset_bin;
    param->value.cs_info.final_character_set_of_str_value= &my_charset_bin;
    param->item_type= Item::STRING_ITEM;
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    param->item_result_type= STRING_RESULT;
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    break;
  default:
    /*
      The client library ensures that we won't get any other typecodes
      except typecodes above and typecodes for string types. Marking
      label as 'default' lets us to handle malformed packets as well.
    */
    {
      CHARSET_INFO *fromcs= thd->variables.character_set_client;
      CHARSET_INFO *tocs= thd->variables.collation_connection;
      uint32 dummy_offset;

      param->value.cs_info.character_set_client= fromcs;

      /*
        Setup source and destination character sets so that they
        are different only if conversion is necessary: this will
        make later checks easier.
      */
      param->value.cs_info.final_character_set_of_str_value=
        String::needs_conversion(0, fromcs, tocs, &dummy_offset) ?
        tocs : fromcs;
      param->set_param_func= set_param_str;
      /*
        Exact value of max_length is not known unless data is converted to
        charset of connection, so we have to set it later.
      */
      param->item_type= Item::STRING_ITEM;
      param->item_result_type= STRING_RESULT;
    }
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  }
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  param->param_type= (enum enum_field_types) param_type;
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}

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#ifndef EMBEDDED_LIBRARY
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/*
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  Update the parameter markers by reading data from client packet 
  and if binary/update log is set, generate the valid query.
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*/

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static bool insert_params_withlog(Prepared_statement *stmt, uchar *null_array,
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                                  uchar *read_pos, uchar *data_end, 
                                  String *query)
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{
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  THD  *thd= stmt->thd;
  Item_param **begin= stmt->param_array;
  Item_param **end= begin + stmt->param_count;
  uint32 length= 0;

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  String str; 
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  const String *res;

  DBUG_ENTER("insert_params_withlog"); 
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  if (query->copy(stmt->query, stmt->query_length, default_charset_info))
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    DBUG_RETURN(1);
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  for (Item_param **it= begin; it < end; ++it)
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  {
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    Item_param *param= *it;
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    if (param->state != Item_param::LONG_DATA_VALUE)
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    {
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      if (is_param_null(null_array, it - begin))
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        param->set_null();
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      else
      {
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        if (read_pos >= data_end)
          DBUG_RETURN(1);
        param->set_param_func(param, &read_pos, data_end - read_pos);
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      }
    }
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    res= param->query_val_str(&str);
    if (param->convert_str_value(thd))
      DBUG_RETURN(1);                           /* out of memory */

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    if (query->replace(param->pos_in_query+length, 1, *res))
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      DBUG_RETURN(1);
    
    length+= res->length()-1;
  }
  DBUG_RETURN(0);
}

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static bool insert_params(Prepared_statement *stmt, uchar *null_array,
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                          uchar *read_pos, uchar *data_end, 
                          String *expanded_query)
614
{
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  Item_param **begin= stmt->param_array;
  Item_param **end= begin + stmt->param_count;
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  DBUG_ENTER("insert_params"); 

620
  for (Item_param **it= begin; it < end; ++it)
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  {
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    Item_param *param= *it;
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    if (param->state != Item_param::LONG_DATA_VALUE)
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    {
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      if (is_param_null(null_array, it - begin))
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        param->set_null();
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      else
      {
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        if (read_pos >= data_end)
          DBUG_RETURN(1);
        param->set_param_func(param, &read_pos, data_end - read_pos);
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      }
    }
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    if (param->convert_str_value(stmt->thd))
      DBUG_RETURN(1);                           /* out of memory */
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  }
  DBUG_RETURN(0);
}

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static bool setup_conversion_functions(Prepared_statement *stmt,
642
                                       uchar **data, uchar *data_end)
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{
  /* skip null bits */
  uchar *read_pos= *data + (stmt->param_count+7) / 8;
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  DBUG_ENTER("setup_conversion_functions");
648

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  if (*read_pos++) //types supplied / first execute
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  {
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    /*
      First execute or types altered by the client, setup the 
      conversion routines for all parameters (one time)
    */
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    Item_param **it= stmt->param_array;
    Item_param **end= it + stmt->param_count;
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    THD *thd= stmt->thd;
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    for (; it < end; ++it)
    {
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      ushort typecode;
      const uint signed_bit= 1 << 15;

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      if (read_pos >= data_end)
        DBUG_RETURN(1);
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      typecode= sint2korr(read_pos);
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      read_pos+= 2;
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      (**it).unsigned_flag= test(typecode & signed_bit);
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      setup_one_conversion_function(thd, *it, (uchar) (typecode & ~signed_bit));
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    }
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  }
  *data= read_pos;
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  DBUG_RETURN(0);
}

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#else

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static bool emb_insert_params(Prepared_statement *stmt, String *expanded_query)
679
{
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  THD *thd= stmt->thd;
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  Item_param **it= stmt->param_array;
  Item_param **end= it + stmt->param_count;
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  MYSQL_BIND *client_param= stmt->thd->client_params;

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  DBUG_ENTER("emb_insert_params");
686

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  for (; it < end; ++it, ++client_param)
  {
    Item_param *param= *it;
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    setup_one_conversion_function(thd, param, client_param->buffer_type);
    if (param->state != Item_param::LONG_DATA_VALUE)
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    {
      if (*client_param->is_null)
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        param->set_null();
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      else
      {
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        uchar *buff= (uchar*) client_param->buffer;
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        param->unsigned_flag= client_param->is_unsigned;
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        param->set_param_func(param, &buff,
                              client_param->length ? 
                              *client_param->length : 
                              client_param->buffer_length);
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      }
    }
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    if (param->convert_str_value(thd))
      DBUG_RETURN(1);                           /* out of memory */
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  }
  DBUG_RETURN(0);
}

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712
static bool emb_insert_params_withlog(Prepared_statement *stmt, String *query)
713
{
714
  THD *thd= stmt->thd;
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  Item_param **it= stmt->param_array;
  Item_param **end= it + stmt->param_count;
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  MYSQL_BIND *client_param= thd->client_params;

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  String str;
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  const String *res;
721
  uint32 length= 0;
722

723
  DBUG_ENTER("emb_insert_params_withlog");
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725
  if (query->copy(stmt->query, stmt->query_length, default_charset_info))
726 727
    DBUG_RETURN(1);
  
728 729 730
  for (; it < end; ++it, ++client_param)
  {
    Item_param *param= *it;
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    setup_one_conversion_function(thd, param, client_param->buffer_type);
    if (param->state != Item_param::LONG_DATA_VALUE)
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    {
      if (*client_param->is_null)
735
        param->set_null();
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      else
      {
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        uchar *buff= (uchar*)client_param->buffer;
739
	param->unsigned_flag= client_param->is_unsigned;
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        param->set_param_func(param, &buff,
                              client_param->length ? 
                              *client_param->length : 
                              client_param->buffer_length);
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      }
    }
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    res= param->query_val_str(&str);
    if (param->convert_str_value(thd))
      DBUG_RETURN(1);                           /* out of memory */

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    if (query->replace(param->pos_in_query+length, 1, *res))
751
      DBUG_RETURN(1);
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    length+= res->length()-1;
  }
  DBUG_RETURN(0);
}

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#endif /*!EMBEDDED_LIBRARY*/

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/*
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  Set prepared statement parameters from user variables.
  SYNOPSIS
    insert_params_from_vars()
      stmt      Statement
      varnames  List of variables. Caller must ensure that number of variables
                in the list is equal to number of statement parameters
768
      query     Ignored
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*/

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static bool insert_params_from_vars(Prepared_statement *stmt,
                                    List<LEX_STRING>& varnames,
773
                                    String *query __attribute__((unused)))
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{
  Item_param **begin= stmt->param_array;
  Item_param **end= begin + stmt->param_count;
  user_var_entry *entry;
  LEX_STRING *varname;
  List_iterator<LEX_STRING> var_it(varnames);
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  DBUG_ENTER("insert_params_from_vars");

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  for (Item_param **it= begin; it < end; ++it)
  {
    Item_param *param= *it;
    varname= var_it++;
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    entry= (user_var_entry*)hash_search(&stmt->thd->user_vars,
                                        (byte*) varname->str,
                                         varname->length);
    if (param->set_from_user_var(stmt->thd, entry) ||
        param->convert_str_value(stmt->thd))
      DBUG_RETURN(1);
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  }
  DBUG_RETURN(0);
}

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/*
798 799 800 801 802 803 804 805 806 807
  Do the same as insert_params_from_vars but also construct query text for
  binary log.
  SYNOPSIS
    insert_params_from_vars()
      stmt      Statement
      varnames  List of variables. Caller must ensure that number of variables
                in the list is equal to number of statement parameters
      query     The query with parameter markers replaced with their values
*/

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static bool insert_params_from_vars_with_log(Prepared_statement *stmt,
809
                                             List<LEX_STRING>& varnames,
810
                                             String *query)
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{
  Item_param **begin= stmt->param_array;
  Item_param **end= begin + stmt->param_count;
  user_var_entry *entry;
  LEX_STRING *varname;
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  DBUG_ENTER("insert_params_from_vars");
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  List_iterator<LEX_STRING> var_it(varnames);
819
  String str;
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  uint32 length= 0;
821
  if (query->copy(stmt->query, stmt->query_length, default_charset_info))
822
    DBUG_RETURN(1);
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  for (Item_param **it= begin; it < end; ++it)
  {
    Item_param *param= *it;
    varname= var_it++;
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    if (get_var_with_binlog(stmt->thd, *varname, &entry))
        DBUG_RETURN(1);
    DBUG_ASSERT(entry);
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    if (param->set_from_user_var(stmt->thd, entry))
      DBUG_RETURN(1);
    /* Insert @'escaped-varname' instead of parameter in the query */
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    char *buf, *ptr;
    str.length(0);
    if (str.reserve(entry->name.length*2+3))
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      DBUG_RETURN(1);
839 840 841 842 843

    buf= str.c_ptr_quick();
    ptr= buf;
    *ptr++= '@';
    *ptr++= '\'';
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    ptr+=
      escape_string_for_mysql(&my_charset_utf8_general_ci,
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                              ptr, entry->name.str, entry->name.length);
    *ptr++= '\'';
    str.length(ptr - buf);

    if (param->convert_str_value(stmt->thd))
      DBUG_RETURN(1);                           /* out of memory */
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    if (query->replace(param->pos_in_query+length, 1, str))
      DBUG_RETURN(1);
    length+= str.length()-1;
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  }
  DBUG_RETURN(0);
}

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/*
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  Validate INSERT statement: 

863
  SYNOPSIS
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    mysql_test_insert()
    stmt	prepared statemen handler
    tables	list of tables queries  

868 869 870 871
  RETURN VALUE
    0   ok
    1   error, sent to the client
   -1   error, not sent to client
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*/
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static int mysql_test_insert(Prepared_statement *stmt,
			     TABLE_LIST *table_list,
			     List<Item> &fields, 
			     List<List_item> &values_list,
			     List<Item> &update_fields,
			     List<Item> &update_values,
			     enum_duplicates duplic)
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{
881
  THD *thd= stmt->thd;
882
  LEX *lex= stmt->lex;
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  List_iterator_fast<List_item> its(values_list);
  List_item *values;
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  int res= -1;
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  TABLE_LIST *insert_table_list=
    (TABLE_LIST*) lex->select_lex.table_list.first;
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  my_bool update= (lex->value_list.elements ? UPDATE_ACL : 0);
889
  DBUG_ENTER("mysql_test_insert");
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  if ((res= insert_precheck(thd, table_list, update)))
    DBUG_RETURN(res);
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  /*
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     open temporary memory pool for temporary data allocated by derived
     tables & preparation procedure
  */
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  if (open_and_lock_tables(thd, table_list))
899
  {
900
    DBUG_RETURN(-1);
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  }

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  if ((values= its++))
  {
    uint value_count;
906
    ulong counter= 0;
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    if ((res= mysql_prepare_insert(thd, table_list, insert_table_list,
				   table_list->table, fields, values,
				   update_fields, update_values, duplic)))
      goto error;
    
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    value_count= values->elements;
    its.rewind();
   
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    while ((values= its++))
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    {
      counter++;
      if (values->elements != value_count)
      {
        my_printf_error(ER_WRONG_VALUE_COUNT_ON_ROW,
			ER(ER_WRONG_VALUE_COUNT_ON_ROW),
923
			MYF(0), counter);
924
        goto error;
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      }
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      if (setup_fields(thd, 0, insert_table_list, *values, 0, 0, 0))
	goto error;
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    }
  }
930

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  res= 0;
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error:
  lex->unit.cleanup();
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  DBUG_RETURN(res);
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}


/*
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  Validate UPDATE statement

941
  SYNOPSIS
942
    mysql_test_update()
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    stmt	prepared statemen handler
    tables	list of tables queries

946 947 948 949
  RETURN VALUE
    0   success
    1   error, sent to client
   -1   error, not sent to client
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*/
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static int mysql_test_update(Prepared_statement *stmt,
			     TABLE_LIST *table_list)
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{
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  int res;
955
  THD *thd= stmt->thd;
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  SELECT_LEX *select= &stmt->lex->select_lex;
  DBUG_ENTER("mysql_test_update");

  if ((res= update_precheck(thd, table_list)))
    DBUG_RETURN(res);
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  if (open_and_lock_tables(thd, table_list))
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    res= -1;
  else
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  {
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    TABLE_LIST *update_table_list= (TABLE_LIST *)select->table_list.first;
    if (!(res= mysql_prepare_update(thd, table_list,
				    update_table_list,
				    &select->where,
				    select->order_list.elements,
				    (ORDER *) select->order_list.first)))
    {
      if (setup_fields(thd, 0, update_table_list,
		       select->item_list, 1, 0, 0) ||
	  setup_fields(thd, 0, update_table_list,
		       stmt->lex->value_list, 0, 0, 0))
	res= -1;
    }
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    stmt->lex->unit.cleanup();
  }
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  /* TODO: here we should send types of placeholders to the client. */ 
  DBUG_RETURN(res);
}
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/*
  Validate DELETE statement

  SYNOPSIS
    mysql_test_delete()
    stmt	prepared statemen handler
    tables	list of tables queries

  RETURN VALUE
    0   success
    1   error, sent to client
   -1   error, not sent to client
*/
static int mysql_test_delete(Prepared_statement *stmt,
			     TABLE_LIST *table_list)
{
  int res;
  THD *thd= stmt->thd;
  LEX *lex= stmt->lex;
  DBUG_ENTER("mysql_test_delete");

  if ((res= delete_precheck(thd, table_list)))
    DBUG_RETURN(res);

  if (open_and_lock_tables(thd, table_list))
    res= -1;
  else
  {
    res= mysql_prepare_delete(thd, table_list, &lex->select_lex.where);
    lex->unit.cleanup();
  }
  /* TODO: here we should send types of placeholders to the client. */ 
  DBUG_RETURN(res);
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}

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/*
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  Validate SELECT statement.
1024 1025
  In case of success, if this query is not EXPLAIN, send column list info
  back to client. 
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1027
  SYNOPSIS
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    mysql_test_select()
    stmt	prepared statemen handler
    tables	list of tables queries

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  RETURN VALUE
    0   success
    1   error, sent to client
   -1   error, not sent to client
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*/
1037

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static int mysql_test_select(Prepared_statement *stmt,
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			     TABLE_LIST *tables, bool text_protocol)
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{
1041
  THD *thd= stmt->thd;
1042
  LEX *lex= stmt->lex;
1043
  SELECT_LEX_UNIT *unit= &lex->unit;
1044

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  DBUG_ENTER("mysql_test_select");
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#ifndef NO_EMBEDDED_ACCESS_CHECKS
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  ulong privilege= lex->exchange ? SELECT_ACL | FILE_ACL : SELECT_ACL;
  if (tables)
  {
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    if (check_table_access(thd, privilege, tables,0))
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      DBUG_RETURN(1);
  }
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  else if (check_access(thd, privilege, any_db,0,0,0))
1055
    DBUG_RETURN(1);
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#endif
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  if (open_and_lock_tables(thd, tables))
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  {
    send_error(thd);
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    goto err;
1062
  }
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  thd->used_tables= 0;                        // Updated by setup_fields

  // JOIN::prepare calls
  if (unit->prepare(thd, 0, 0))
  {
    send_error(thd);
    goto err_prep;
  }
1072
  if (!text_protocol)
1073
  {
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    if (lex->describe)
    {
      if (send_prep_stmt(stmt, 0))
        goto err_prep;
    }
    else
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    {
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      if (send_prep_stmt(stmt, lex->select_lex.item_list.elements) ||
1082
          thd->protocol_simple.send_fields(&lex->select_lex.item_list, 0)
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#ifndef EMBEDDED_LIBRARY
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          || net_flush(&thd->net)
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#endif
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         )
        goto err_prep;
    }
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  }
1090
  unit->cleanup();
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  DBUG_RETURN(0);

err_prep:
  unit->cleanup();
err:
  DBUG_RETURN(1);
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}

1099

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/*
  Validate and prepare for execution DO statement expressions

  SYNOPSIS
    mysql_test_do_fields()
    stmt	prepared statemen handler
    tables	list of tables queries
    values	list of expressions

  RETURN VALUE
    0   success
    1   error, sent to client
   -1   error, not sent to client
*/

static int mysql_test_do_fields(Prepared_statement *stmt,
				TABLE_LIST *tables,
				List<Item> *values)
{
  DBUG_ENTER("mysql_test_do_fields");
  THD *thd= stmt->thd;
  int res= 0;
  if (tables && (res= check_table_access(thd, SELECT_ACL, tables, 0)))
    DBUG_RETURN(res);
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1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162
  if (tables && (res= open_and_lock_tables(thd, tables)))
  {
    DBUG_RETURN(res);
  }
  res= setup_fields(thd, 0, 0, *values, 0, 0, 0);
  stmt->lex->unit.cleanup();
  if (res)
    DBUG_RETURN(-1);
  DBUG_RETURN(0);
}


/*
  Validate and prepare for execution SET statement expressions

  SYNOPSIS
    mysql_test_set_fields()
    stmt	prepared statemen handler
    tables	list of tables queries
    values	list of expressions

  RETURN VALUE
    0   success
    1   error, sent to client
   -1   error, not sent to client
*/
static int mysql_test_set_fields(Prepared_statement *stmt,
				TABLE_LIST *tables,
				List<set_var_base> *var_list)
{
  DBUG_ENTER("mysql_test_set_fields");
  List_iterator_fast<set_var_base> it(*var_list);
  THD *thd= stmt->thd;
  set_var_base *var;
  int res= 0;

  if (tables && (res= check_table_access(thd, SELECT_ACL, tables, 0)))
    DBUG_RETURN(res);
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1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175
  if (tables && (res= open_and_lock_tables(thd, tables)))
    goto error;
  while ((var= it++))
  {
    if (var->light_check(thd))
    {
      stmt->lex->unit.cleanup();
      res= -1;
      goto error;
    }
  }
error:
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  stmt->lex->unit.cleanup();
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  DBUG_RETURN(res);
}


/*
  Check internal SELECT of the prepared command

  SYNOPSIS
    select_like_statement_test()
      stmt	- prepared table handler
      tables	- global list of tables

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  RETURN VALUE
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    0   success
    1   error, sent to client
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   -1   error, not sent to client
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*/
static int select_like_statement_test(Prepared_statement *stmt,
				      TABLE_LIST *tables)
{
  DBUG_ENTER("select_like_statement_test");
  THD *thd= stmt->thd;
  LEX *lex= stmt->lex;
  int res= 0;
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  if (tables && (res= open_and_lock_tables(thd, tables)))
    goto end;

  thd->used_tables= 0;                        // Updated by setup_fields

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  // JOIN::prepare calls
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  if (lex->unit.prepare(thd, 0, 0))
  {
    res= thd->net.report_error ? -1 : 1;
  }
end:
  lex->unit.cleanup();
  DBUG_RETURN(res);
}


/*
1219
  Validate and prepare for execution CREATE TABLE statement
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  SYNOPSIS
    mysql_test_create_table()
    stmt	prepared statemen handler
    tables	list of tables queries

  RETURN VALUE
    0   success
    1   error, sent to client
   -1   error, not sent to client
*/
static int mysql_test_create_table(Prepared_statement *stmt,
				   TABLE_LIST *tables)
{
  DBUG_ENTER("mysql_test_create_table");
  THD *thd= stmt->thd;
  LEX *lex= stmt->lex;
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  SELECT_LEX *select_lex= &lex->select_lex;
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  int res= 0;

  /* Skip first table, which is the table we are creating */
  TABLE_LIST *create_table, *create_table_local;
  tables= lex->unlink_first_table(tables, &create_table,
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				  &create_table_local);
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  if (!(res= create_table_precheck(thd, tables, create_table)) &&
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      select_lex->item_list.elements)
  {
    select_lex->resolve_mode= SELECT_LEX::SELECT_MODE;
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    res= select_like_statement_test(stmt, tables);
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    select_lex->resolve_mode= SELECT_LEX::NOMATTER_MODE;
  }
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  /* put tables back for PS rexecuting */
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  tables= lex->link_first_table_back(tables, create_table,
				     create_table_local);
  DBUG_RETURN(res);
}

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1260
/*
1261
  Validate and prepare for execution multi update statement
1262 1263 1264 1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283

  SYNOPSIS
    mysql_test_multiupdate()
    stmt	prepared statemen handler
    tables	list of tables queries

  RETURN VALUE
    0   success
    1   error, sent to client
   -1   error, not sent to client
*/
static int mysql_test_multiupdate(Prepared_statement *stmt,
				  TABLE_LIST *tables)
{
  int res;
  if ((res= multi_update_precheck(stmt->thd, tables)))
    return res;
  return select_like_statement_test(stmt, tables);
}


/*
1284
  Validate and prepare for execution multi delete statement
1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303

  SYNOPSIS
    mysql_test_multidelete()
    stmt	prepared statemen handler
    tables	list of tables queries

  RETURN VALUE
    0   success
    1   error, sent to client
   -1   error, not sent to client
*/
static int mysql_test_multidelete(Prepared_statement *stmt,
				  TABLE_LIST *tables)
{
  int res;
  stmt->thd->lex->current_select= &stmt->thd->lex->select_lex;
  if (add_item_to_list(stmt->thd, new Item_null()))
    return -1;

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  uint fake_counter;
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  if ((res= multi_delete_precheck(stmt->thd, tables, &fake_counter)))
    return res;
  return select_like_statement_test(stmt, tables);
}


/*
  Validate and prepare for execution INSERT ... SELECT statement

  SYNOPSIS
    mysql_test_insert_select()
    stmt	prepared statemen handler
    tables	list of tables queries

  RETURN VALUE
    0   success
    1   error, sent to client
   -1   error, not sent to client
*/
static int mysql_test_insert_select(Prepared_statement *stmt,
				    TABLE_LIST *tables)
{
  int res;
  LEX *lex= stmt->lex;
  if ((res= insert_select_precheck(stmt->thd, tables)))
    return res;
  TABLE_LIST *first_local_table=
    (TABLE_LIST *)lex->select_lex.table_list.first;
  /* Skip first table, which is the table we are inserting in */
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  lex->select_lex.table_list.first= (byte*) first_local_table->next;
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  /*
    insert/replace from SELECT give its SELECT_LEX for SELECT,
    and item_list belong to SELECT
  */
  lex->select_lex.resolve_mode= SELECT_LEX::SELECT_MODE;
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  res= select_like_statement_test(stmt, tables);
  /* revert changes*/
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  lex->select_lex.table_list.first= (byte*) first_local_table;
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  lex->select_lex.resolve_mode= SELECT_LEX::INSERT_MODE;
  return res;
}


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/*
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  Send the prepare query results back to client
  SYNOPSIS
  send_prepare_results()
    stmt prepared statement
  RETURN VALUE
    0   success
    1   error, sent to client
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*/
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static int send_prepare_results(Prepared_statement *stmt, bool text_protocol)
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{   
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  THD *thd= stmt->thd;
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  LEX *lex= stmt->lex;
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  SELECT_LEX *select_lex= &lex->select_lex;
  TABLE_LIST *tables=(TABLE_LIST*) select_lex->table_list.first;
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  enum enum_sql_command sql_command= lex->sql_command;
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  int res= 0;
  DBUG_ENTER("send_prepare_results");

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  DBUG_PRINT("enter",("command: %d, param_count: %ld",
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                      sql_command, stmt->param_count));
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  if ((&lex->select_lex != lex->all_selects_list ||
       lex->time_zone_tables_used) &&
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      lex->unit.create_total_list(thd, lex, &tables))
    DBUG_RETURN(1);

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  switch (sql_command) {
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  case SQLCOM_REPLACE:
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  case SQLCOM_INSERT:
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    res= mysql_test_insert(stmt, tables, lex->field_list,
			   lex->many_values,
			   select_lex->item_list, lex->value_list,
			   (lex->value_list.elements ?
			    DUP_UPDATE : lex->duplicates));
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    break;

  case SQLCOM_UPDATE:
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    res= mysql_test_update(stmt, tables);
    break;

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  case SQLCOM_DELETE:
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    res= mysql_test_delete(stmt, tables);
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    break;

  case SQLCOM_SELECT:
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    if ((res= mysql_test_select(stmt, tables, text_protocol)))
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      goto error;
    /* Statement and field info has already been sent */
    DBUG_RETURN(0);
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  case SQLCOM_CREATE_TABLE:
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    res= mysql_test_create_table(stmt, tables);
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    break;
  
  case SQLCOM_DO:
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    res= mysql_test_do_fields(stmt, tables, lex->insert_list);
    break;
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  case SQLCOM_SET_OPTION:
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    res= mysql_test_set_fields(stmt, tables, &lex->var_list);
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    break;

  case SQLCOM_DELETE_MULTI:
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    res= mysql_test_multidelete(stmt, tables);
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    break;
  
  case SQLCOM_UPDATE_MULTI:
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    res= mysql_test_multiupdate(stmt, tables);
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    break;

  case SQLCOM_INSERT_SELECT:
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    res= mysql_test_insert_select(stmt, tables);
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    break;

  case SQLCOM_SHOW_DATABASES:
  case SQLCOM_SHOW_PROCESSLIST:
  case SQLCOM_SHOW_STORAGE_ENGINES:
  case SQLCOM_SHOW_PRIVILEGES:
  case SQLCOM_SHOW_COLUMN_TYPES:
  case SQLCOM_SHOW_STATUS:
  case SQLCOM_SHOW_VARIABLES:
  case SQLCOM_SHOW_LOGS:
  case SQLCOM_SHOW_TABLES:
  case SQLCOM_SHOW_OPEN_TABLES:
  case SQLCOM_SHOW_CHARSETS:
  case SQLCOM_SHOW_COLLATIONS:
  case SQLCOM_SHOW_FIELDS:
  case SQLCOM_SHOW_KEYS:
  case SQLCOM_SHOW_CREATE_DB:
  case SQLCOM_SHOW_GRANTS:
  case SQLCOM_DROP_TABLE:
  case SQLCOM_RENAME_TABLE:
    break;

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  default:
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    /*
      All other is not supported yet
1447
    */
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    res= -1;
    my_error(ER_UNSUPPORTED_PS, MYF(0));
    goto error;
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  }
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  if (res == 0)
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    DBUG_RETURN(text_protocol? 0 : send_prep_stmt(stmt, 0));
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error:
  if (res < 0)
    send_error(thd, thd->killed ? ER_SERVER_SHUTDOWN : 0);
1457
  DBUG_RETURN(1);
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}

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/*
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  Initialize array of parameters in statement from LEX.
  (We need to have quick access to items by number in mysql_stmt_get_longdata).
1463
  This is to avoid using malloc/realloc in the parser.
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*/
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static bool init_param_array(Prepared_statement *stmt)
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{
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  LEX *lex= stmt->lex;
  if ((stmt->param_count= lex->param_list.elements))
  {
    Item_param **to;
    List_iterator<Item_param> param_iterator(lex->param_list);
    /* Use thd->mem_root as it points at statement mem_root */
    stmt->param_array= (Item_param **)
                       alloc_root(&stmt->thd->mem_root,
                                  sizeof(Item_param*) * stmt->param_count);
    if (!stmt->param_array)
    {
      send_error(stmt->thd, ER_OUT_OF_RESOURCES);
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      return 1;
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    }
    for (to= stmt->param_array;
         to < stmt->param_array + stmt->param_count;
         ++to)
    {
      *to= param_iterator++;
    }
  }
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  return 0;
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}
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/*
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  Given a query string with parameter markers, create a Prepared Statement
  from it and send PS info back to the client.
  
1497 1498
  SYNOPSIS
    mysql_stmt_prepare()
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      packet         query to be prepared 
      packet_length  query string length, including ignored trailing NULL or 
                     quote char.
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      name           NULL or statement name. For unnamed statements binary PS
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                     protocol is used, for named statements text protocol is 
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                     used.
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  RETURN 
    0      OK, statement prepared successfully
    other  Error
  
  NOTES
    This function parses the query and sends the total number of parameters 
    and resultset metadata information back to client (if any), without 
    executing the query i.e. without any log/disk writes. This allows the 
    queries to be re-executed without re-parsing during execute. 

    If parameter markers are found in the query, then store the information
    using Item_param along with maintaining a list in lex->param_array, so 
    that a fast and direct retrieval can be made without going through all 
    field items.
1519
   
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*/

1522 1523
int mysql_stmt_prepare(THD *thd, char *packet, uint packet_length,
                       LEX_STRING *name)
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{
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  LEX *lex;
  Prepared_statement *stmt= new Prepared_statement(thd);
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  int error;
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  DBUG_ENTER("mysql_stmt_prepare");
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  DBUG_PRINT("prep_query", ("%s", packet));
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  if (stmt == 0)
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  {
    send_error(thd, ER_OUT_OF_RESOURCES);
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    DBUG_RETURN(1);
  }

  if (name)
  {
    stmt->name.length= name->length;
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    if (!(stmt->name.str= memdup_root(&stmt->mem_root, (char*)name->str,
1542
                                      name->length)))
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    {
      delete stmt;
      send_error(thd, ER_OUT_OF_RESOURCES);
      DBUG_RETURN(1);
    }
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  }
1549 1550

  if (thd->stmt_map.insert(stmt))
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  {
    delete stmt;
    send_error(thd, ER_OUT_OF_RESOURCES);
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    DBUG_RETURN(1);
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  }
1556

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  thd->set_n_backup_statement(stmt, &thd->stmt_backup);
  thd->set_n_backup_item_arena(stmt, &thd->stmt_backup);
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1560
  if (alloc_query(thd, packet, packet_length))
1561
  {
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    thd->restore_backup_statement(stmt, &thd->stmt_backup);
    thd->restore_backup_item_arena(stmt, &thd->stmt_backup);
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    /* Statement map deletes statement on erase */
    thd->stmt_map.erase(stmt);
    send_error(thd, ER_OUT_OF_RESOURCES);
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    DBUG_RETURN(1);
1568
  }
1569

1570
  mysql_log.write(thd, COM_PREPARE, "%s", packet);
1571

1572
  thd->current_arena= stmt;
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  mysql_init_query(thd, (uchar *) thd->query, thd->query_length);
  lex= thd->lex;
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  lex->safe_to_cache_query= 0;

1577
  error= yyparse((void *)thd) || thd->is_fatal_error ||
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         init_param_array(stmt);
  /*
    While doing context analysis of the query (in send_prepare_results) we
    allocate a lot of additional memory: for open tables, JOINs, derived
    tables, etc.  Let's save a snapshot of current parse tree to the
    statement and restore original THD. In cases when some tree
    transformation can be reused on execute, we set again thd->mem_root from
    stmt->mem_root (see setup_wild for one place where we do that).
  */
  thd->restore_backup_item_arena(stmt, &thd->stmt_backup);

  if (!error)
    error= send_prepare_results(stmt, test(name));
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  /* restore to WAIT_PRIOR: QUERY_PRIOR is set inside alloc_query */
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  if (!(specialflag & SPECIAL_NO_PRIOR))
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    my_pthread_setprio(pthread_self(),WAIT_PRIOR);
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  lex_end(lex);
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  thd->restore_backup_statement(stmt, &thd->stmt_backup);
  cleanup_items(stmt->free_list);
  close_thread_tables(thd);
  free_items(thd->free_list);
  thd->free_list= 0;
  thd->current_arena= thd;
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1603
  if (error)
1604
  {
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    /* Statement map deletes statement on erase */
    thd->stmt_map.erase(stmt);
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    stmt= NULL;
1608
    /* error is sent inside yyparse/send_prepare_results */
1609
  }
1610 1611
  else
  {
1612
    stmt->setup_set_params();
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    SELECT_LEX *sl= stmt->lex->all_selects_list;
    /*
      Save WHERE clause pointers, because they may be changed during query
      optimisation.
    */
    for (; sl; sl= sl->next_select_in_list())
    {
      sl->prep_where= sl->where;
    }
1622
    stmt->state= (int)Prepared_statement::PREPARED;
1623
  }
1624

1625
  DBUG_RETURN(!stmt);
1626
}
1627

1628
/* Reinit statement before execution */
1629

1630 1631 1632 1633
static void reset_stmt_for_execute(Prepared_statement *stmt)
{
  THD *thd= stmt->thd;
  SELECT_LEX *sl= stmt->lex->all_selects_list;
1634

1635
  for (; sl; sl= sl->next_select_in_list())
1636
  {
1637 1638
    /* remove option which was put by mysql_explain_union() */
    sl->options&= ~SELECT_DESCRIBE;
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    /*
      Copy WHERE clause pointers to avoid damaging they by optimisation
    */
1642
    if (sl->prep_where)
1643
    {
1644
      sl->where= sl->prep_where->copy_andor_structure(thd);
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      sl->where->cleanup();
    }
1647
    DBUG_ASSERT(sl->join == 0);
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    ORDER *order;
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    /* Fix GROUP list */
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    for (order= (ORDER *)sl->group_list.first; order; order= order->next)
      order->item= &order->item_ptr;
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    /* Fix ORDER list */
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    for (order= (ORDER *)sl->order_list.first; order; order= order->next)
      order->item= &order->item_ptr;
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    /*
      TODO: When the new table structure is ready, then have a status bit 
      to indicate the table is altered, and re-do the setup_* 
      and open the tables back.
    */
    for (TABLE_LIST *tables= (TABLE_LIST*) sl->table_list.first;
	 tables;
	 tables= tables->next)
    {
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      /*
        Reset old pointers to TABLEs: they are not valid since the tables
        were closed in the end of previous prepare or execute call.
      */
      tables->table= 0;
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      tables->table_list= 0;
    }
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    {
      SELECT_LEX_UNIT *unit= sl->master_unit();
      unit->unclean();
      unit->types.empty();
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      /* for derived tables & PS (which can't be reset by Item_subquery) */
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      unit->reinit_exec_mechanism();
    }
1680
  }
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  stmt->lex->current_select= &stmt->lex->select_lex;
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}

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/* 
    Clears parameters from data left from previous execution or long data
    
  SYNOPSIS
    reset_stmt_params()
      stmt - prepared statement for which parameters should be reset
*/

static void reset_stmt_params(Prepared_statement *stmt)
{
  Item_param **item= stmt->param_array;
  Item_param **end= item + stmt->param_count;
  for (;item < end ; ++item)
    (**item).reset();
}


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/*
  Executes previously prepared query.
  If there is any parameters, then replace markers with the data supplied
  from client, and then execute the query.
1706
  SYNOPSIS
1707
    mysql_stmt_execute()
1708 1709 1710
      thd            Current thread
      packet         Query string
      packet_length  Query string length, including terminator character.
1711 1712
*/

1713
void mysql_stmt_execute(THD *thd, char *packet, uint packet_length)
1714 1715
{
  ulong stmt_id= uint4korr(packet);
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  /*
    Query text for binary log, or empty string if the query is not put into
    binary log.
  */
  String expanded_query;
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#ifndef EMBEDDED_LIBRARY
1722
  uchar *packet_end= (uchar *) packet + packet_length - 1;
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#endif
1724 1725
  Prepared_statement *stmt;
  DBUG_ENTER("mysql_stmt_execute");
1726 1727

  packet+= 9;                               /* stmt_id + 5 bytes of flags */
1728

1729 1730
  if (!(stmt= find_prepared_statement(thd, stmt_id, "mysql_stmt_execute",
                                      SEND_ERROR)))
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    DBUG_VOID_RETURN;

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  DBUG_PRINT("exec_query:", ("%s", stmt->query));
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1735
  /* Check if we got an error when sending long data */
1736
  if (stmt->state == (int)Item_arena::ERROR)
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  {
    send_error(thd, stmt->last_errno, stmt->last_error);
    DBUG_VOID_RETURN;
  }

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#ifndef EMBEDDED_LIBRARY
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  if (stmt->param_count)
  {
    uchar *null_array= (uchar *) packet;
1746
    if (setup_conversion_functions(stmt, (uchar **) &packet, packet_end) ||
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        stmt->set_params(stmt, null_array, (uchar *) packet, packet_end,
1748
                         &expanded_query))
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      goto set_params_data_err;
  }
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#else
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  /*
    In embedded library we re-install conversion routines each time 
    we set params, and also we don't need to parse packet. 
    So we do it in one function.
  */
1757
  if (stmt->param_count && stmt->set_params_data(stmt, &expanded_query))
1758
    goto set_params_data_err;
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#endif
1760
  DBUG_ASSERT(thd->free_list == NULL);
1761
  thd->protocol= &thd->protocol_prep;           // Switch to binary protocol
1762
  execute_stmt(thd, stmt, &expanded_query, true);
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  thd->protocol= &thd->protocol_simple;         // Use normal protocol
  DBUG_VOID_RETURN;
1765

1766
set_params_data_err:
1767
  reset_stmt_params(stmt);
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  my_error(ER_WRONG_ARGUMENTS, MYF(0), "mysql_stmt_execute");
1769
  send_error(thd);
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  DBUG_VOID_RETURN;
}

1773

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/*
1775
  Execute prepared statement using parameter values from
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  lex->prepared_stmt_params and send result to the client using text protocol.
*/

1779
void mysql_sql_stmt_execute(THD *thd, LEX_STRING *stmt_name)
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{
1781
  Prepared_statement *stmt;
1782
  /*
1783 1784
    Query text for binary log, or empty string if the query is not put into
    binary log.
1785
  */
1786
  String expanded_query;
1787
  DBUG_ENTER("mysql_sql_stmt_execute");
1788

1789 1790
  if (!(stmt= (Prepared_statement*)thd->stmt_map.find_by_name(stmt_name)))
  {
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    my_error(ER_UNKNOWN_STMT_HANDLER, MYF(0), stmt_name->length,
             stmt_name->str, "EXECUTE");
    send_error(thd);
    DBUG_VOID_RETURN;
1795 1796
  }

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  if (stmt->param_count != thd->lex->prepared_stmt_params.elements)
  {
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    my_error(ER_WRONG_ARGUMENTS, MYF(0), "EXECUTE");
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    send_error(thd);
    DBUG_VOID_RETURN;
  }

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  DBUG_ASSERT(thd->free_list == NULL);

  thd->set_n_backup_statement(stmt, &thd->stmt_backup);
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  if (stmt->set_params_from_vars(stmt,
                                 thd->stmt_backup.lex->prepared_stmt_params,
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                                 &expanded_query))
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  {
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    my_error(ER_WRONG_ARGUMENTS, MYF(0), "EXECUTE");
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    send_error(thd);
  }
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  execute_stmt(thd, stmt, &expanded_query, false);
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  DBUG_VOID_RETURN;
}

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/*
  Execute prepared statement.
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  SYNOPSIS
    execute_stmt()
      thd            Current thread
      stmt           Statement to execute
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      expanded_query If binary log is enabled, query string with parameter
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                     placeholders replaced with actual values. Otherwise empty
                     string.
  NOTES
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  Caller must set parameter values and thd::protocol.
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  thd->free_list is assumed to be garbage.
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*/
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static void execute_stmt(THD *thd, Prepared_statement *stmt,
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                         String *expanded_query, bool set_context)
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{
  DBUG_ENTER("execute_stmt");
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  if (set_context)
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    thd->set_n_backup_statement(stmt, &thd->stmt_backup);
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  reset_stmt_for_execute(stmt);
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  if (expanded_query->length() &&
      alloc_query(thd, (char *)expanded_query->ptr(),
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                  expanded_query->length()+1))
  {
    my_error(ER_OUTOFMEMORY, 0, expanded_query->length());
    DBUG_VOID_RETURN;
  }
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  /*
    At first execution of prepared statement we will perform logical
    transformations of the query tree (i.e. negations elimination).
    This should be done permanently on the parse tree of this statement.
  */
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  if (stmt->state == (int)Item_arena::PREPARED)
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    thd->current_arena= stmt;
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  if (!(specialflag & SPECIAL_NO_PRIOR))
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    my_pthread_setprio(pthread_self(),QUERY_PRIOR);
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  mysql_execute_command(thd);
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  thd->lex->unit.cleanup();
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  if (!(specialflag & SPECIAL_NO_PRIOR))
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    my_pthread_setprio(pthread_self(), WAIT_PRIOR);
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  /* Free Items that were created during this execution of the PS. */
  free_items(thd->free_list);
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  thd->free_list= 0;
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  if (stmt->state == (int)Item_arena::PREPARED)
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  {
    thd->current_arena= thd;
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    stmt->state= (int)Item_arena::EXECUTED;
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  }
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  cleanup_items(stmt->free_list);
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  reset_stmt_params(stmt);
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  close_thread_tables(thd);                    // to close derived tables
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  thd->set_statement(&thd->stmt_backup);
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  DBUG_VOID_RETURN;
}

1878

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/*
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  Reset a prepared statement in case there was a recoverable error.
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  SYNOPSIS
    mysql_stmt_reset()
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      thd       Thread handle
      packet	Packet with stmt id 
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  DESCRIPTION
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    This function resets statement to the state it was right after prepare.
    It can be used to:
     - clear an error happened during mysql_stmt_send_long_data
     - cancel long data stream for all placeholders without
       having to call mysql_stmt_execute.
    Sends 'OK' packet in case of success (statement was reset)
    or 'ERROR' packet (unrecoverable error/statement not found/etc).
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*/

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void mysql_stmt_reset(THD *thd, char *packet)
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{
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  /* There is always space for 4 bytes in buffer */
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  ulong stmt_id= uint4korr(packet);
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  Prepared_statement *stmt;
  
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  DBUG_ENTER("mysql_stmt_reset");
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  if (!(stmt= find_prepared_statement(thd, stmt_id, "mysql_stmt_reset",
                                      SEND_ERROR)))
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    DBUG_VOID_RETURN;

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  stmt->state= (int)Item_arena::PREPARED;
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  /* 
    Clear parameters from data which could be set by 
    mysql_stmt_send_long_data() call.
  */
  reset_stmt_params(stmt);
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  send_ok(thd);
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  DBUG_VOID_RETURN;
}


/*
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  Delete a prepared statement from memory.
  Note: we don't send any reply to that command. 
1925 1926
*/

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void mysql_stmt_free(THD *thd, char *packet)
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{
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  /* There is always space for 4 bytes in packet buffer */
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  ulong stmt_id= uint4korr(packet);
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  Prepared_statement *stmt;

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  DBUG_ENTER("mysql_stmt_free");
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  if (!(stmt= find_prepared_statement(thd, stmt_id, "mysql_stmt_close",
                                      DONT_SEND_ERROR)))
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    DBUG_VOID_RETURN;
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  /* Statement map deletes statement on erase */
  thd->stmt_map.erase(stmt);
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  DBUG_VOID_RETURN;
}

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/*
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  Long data in pieces from client
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  SYNOPSIS
    mysql_stmt_get_longdata()
    thd			Thread handle
    pos			String to append
    packet_length	Length of string

  DESCRIPTION
    Get a part of a long data.
    To make the protocol efficient, we are not sending any return packages
    here.
    If something goes wrong, then we will send the error on 'execute'

    We assume that the client takes care of checking that all parts are sent
    to the server. (No checking that we get a 'end of column' in the server)
*/

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void mysql_stmt_get_longdata(THD *thd, char *packet, ulong packet_length)
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{
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  ulong stmt_id;
  uint param_number;
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  Prepared_statement *stmt;
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  Item_param *param;
  char *packet_end= packet + packet_length - 1;
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  DBUG_ENTER("mysql_stmt_get_longdata");

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#ifndef EMBEDDED_LIBRARY
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  /* Minimal size of long data packet is 6 bytes */
  if ((ulong) (packet_end - packet) < MYSQL_LONG_DATA_HEADER)
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  {
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    my_error(ER_WRONG_ARGUMENTS, MYF(0), "mysql_stmt_send_long_data");
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    DBUG_VOID_RETURN;
  }
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#endif
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  stmt_id= uint4korr(packet);
  packet+= 4;
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  if (!(stmt=find_prepared_statement(thd, stmt_id, "mysql_stmt_send_long_data",
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                                     DONT_SEND_ERROR)))
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    DBUG_VOID_RETURN;

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  param_number= uint2korr(packet);
  packet+= 2;
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#ifndef EMBEDDED_LIBRARY
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  if (param_number >= stmt->param_count)
  {
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    /* Error will be sent in execute call */
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    stmt->state= (int)Item_arena::ERROR;
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    stmt->last_errno= ER_WRONG_ARGUMENTS;
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    sprintf(stmt->last_error, ER(ER_WRONG_ARGUMENTS),
            "mysql_stmt_send_long_data");
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    DBUG_VOID_RETURN;
  }
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#endif

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  param= stmt->param_array[param_number];

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#ifndef EMBEDDED_LIBRARY
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  if (param->set_longdata(packet, (ulong) (packet_end - packet)))
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#else
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  if (param->set_longdata(thd->extra_data, thd->extra_length))
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#endif
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  {
2012
    stmt->state= (int)Item_arena::ERROR;
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    stmt->last_errno= ER_OUTOFMEMORY;
    sprintf(stmt->last_error, ER(ER_OUTOFMEMORY), 0);
  }
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  DBUG_VOID_RETURN;
}
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2019 2020 2021 2022

Prepared_statement::Prepared_statement(THD *thd_arg)
  :Statement(thd_arg),
  thd(thd_arg),
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  param_array(0),
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  param_count(0),
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  last_errno(0)
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{
  *last_error= '\0';
}

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void Prepared_statement::setup_set_params()
{
  /* Setup binary logging */
  if (mysql_bin_log.is_open() && is_update_query(lex->sql_command))
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  {
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    set_params_from_vars= insert_params_from_vars_with_log;
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#ifndef EMBEDDED_LIBRARY
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    set_params= insert_params_withlog;
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#else
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    set_params_data= emb_insert_params_withlog;
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#endif
  }
  else
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  {
    set_params_from_vars= insert_params_from_vars;
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#ifndef EMBEDDED_LIBRARY
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    set_params= insert_params;
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#else
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    set_params_data= emb_insert_params;
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#endif
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  }
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}

Prepared_statement::~Prepared_statement()
{
  free_items(free_list);
}


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Item_arena::Type Prepared_statement::type() const
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{
  return PREPARED_STATEMENT;
}