Quelle  pfs_prepared_stmt.cc   Sprache: C

/* Copyright (c) 2014, 2023, Oracle and/or its affiliates.

  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License, version 2.0,
  as published by the Free Software Foundation.

  This program is also distributed with certain software (including
  but not limited to OpenSSL) that is licensed under separate terms,
  as designated in a particular file or component or in included license
  documentation.  The authors of MySQL hereby grant you an additional
  permission to link the program and your derivative works with the
  separately licensed software that they have included with MySQL.

  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, version 2.0, for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software Foundation,
  51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */

/**
  @file storage/perfschema/pfs_prepared_stmt.cc
  Prepared Statement data structures (implementation).
*/

/*
  This code needs extra visibility in the lexer structures
*/

#include "my_global.h"
#include "my_sys.h"
#include "pfs_instr.h"
#include "pfs_prepared_stmt.h"
#include "pfs_global.h"
#include "sql_string.h"
#include "pfs_buffer_container.h"
#include <string.h>

/**
  Initialize table PREPARED_STATEMENTS_INSTANCE.
  @param param performance schema sizing
*/
int init_prepared_stmt(const PFS_global_param *param)
{
  if (global_prepared_stmt_container.init(param->m_prepared_stmt_sizing))
    return 1;

  reset_prepared_stmt_instances();
  return 0;
}

/** Cleanup table PREPARED_STATEMENTS_INSTANCE. */
void cleanup_prepared_stmt(void)
{
  global_prepared_stmt_container.cleanup();
}

void PFS_prepared_stmt::reset_data()
{
  m_prepare_stat.reset();
  m_reprepare_stat.reset();
  m_execute_stat.reset();
}

static void fct_reset_prepared_stmt_instances(PFS_prepared_stmt *pfs)
{
  pfs->reset_data();
}

void reset_prepared_stmt_instances()
{
  global_prepared_stmt_container.apply_all(fct_reset_prepared_stmt_instances);
}

PFS_prepared_stmt*
create_prepared_stmt(void * /* identity */,
                     PFS_thread *thread, PFS_program *pfs_program,
                     PFS_events_statements *pfs_stmt, uint stmt_id,
                     const char* stmt_name, uint stmt_name_length)
{
  PFS_prepared_stmt *pfs= NULL;
  pfs_dirty_state dirty_state;
  pfs_identity id;

  /* Create a new record in prepared stmt stat array. */
  pfs= global_prepared_stmt_container.allocate(& dirty_state, &id);
  if (pfs != NULL)
  {
    pfs->m_identity= id;
    /* Reset the stats. */
    pfs->reset_data();
    /* Do the assignments. */
    pfs->m_sqltext_length= 0;

    if (stmt_name != NULL)
    {
      pfs->m_stmt_name_length= stmt_name_length;
      if (pfs->m_stmt_name_length > PS_NAME_LENGTH)
        pfs->m_stmt_name_length= PS_NAME_LENGTH;
      strncpy(pfs->m_stmt_name, stmt_name, pfs->m_stmt_name_length);
    }
    else
      pfs->m_stmt_name_length= 0;

    pfs->m_stmt_id= stmt_id;
    pfs->m_owner_thread_id= thread->m_thread_internal_id;

    /* If this statement prepare is called from a SP. */
    if (pfs_program)
    {
      pfs->m_owner_object_type= pfs_program->m_type;
      strncpy(pfs->m_owner_object_schema, pfs_program->m_schema_name, pfs_program->m_schema_name_length);
      pfs->m_owner_object_schema_length= pfs_program->m_schema_name_length;
      strncpy(pfs->m_owner_object_name, pfs_program->m_object_name, pfs_program->m_object_name_length);
      pfs->m_owner_object_name_length= pfs_program->m_object_name_length;
    }
    else
    {
      pfs->m_owner_object_type= NO_OBJECT_TYPE;
      pfs->m_owner_object_schema_length= 0;
      pfs->m_owner_object_name_length= 0;
    }

    if (pfs_stmt)
    {
      if (pfs_program)
        pfs->m_owner_event_id= pfs_stmt->m_event.m_nesting_event_id;
      else
        pfs->m_owner_event_id= pfs_stmt->m_event.m_event_id;
    }

    /* Insert this record. */
    pfs->m_lock.dirty_to_allocated(& dirty_state);
  }

  return pfs;
}

void delete_prepared_stmt(PFS_prepared_stmt *pfs)
{
  global_prepared_stmt_container.deallocate(pfs);
  return;
}