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drizzled/statement/replace_select.cc
 
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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 
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 *
 
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 *  Copyright (C) 2009 Sun Microsystems
 
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 *
 
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 *  This program is free software; you can redistribute it and/or modify
 
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 *  it under the terms of the GNU General Public License as published by
 
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 *  the Free Software Foundation; either version 2 of the License, or
 
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 *  (at your option) any later version.
 
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 *
 
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 *  This program is distributed in the hope that it will be useful,
 
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 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
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 *  GNU General Public License for more details.
 
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 *
 
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 *  You should have received a copy of the GNU General Public License
 
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 *  along with this program; if not, write to the Free Software
 
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 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 
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 */
 
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#include <drizzled/server_includes.h>
 
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#include <drizzled/show.h>
 
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#include <drizzled/lock.h>
 
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#include <drizzled/session.h>
 
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#include <drizzled/statement/replace_select.h>
 
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using namespace drizzled;
 
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bool statement::ReplaceSelect::execute()
 
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{
 
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  TableList *first_table= (TableList *) session->lex->select_lex.table_list.first;
 
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  TableList *all_tables= session->lex->query_tables;
 
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  assert(first_table == all_tables && first_table != 0);
 
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  Select_Lex *select_lex= &session->lex->select_lex;
 
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  Select_Lex_Unit *unit= &session->lex->unit;
 
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  select_result *sel_result= NULL;
 
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  bool res= false;
 
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  bool need_start_waiting= false;
 
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  if (insert_precheck(session, all_tables))
 
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  {
 
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    return true;
 
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  }
 
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  /* Don't unlock tables until command is written to binary log */
 
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  select_lex->options|= SELECT_NO_UNLOCK;
 
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  unit->set_limit(select_lex);
 
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  if (! (need_start_waiting= ! wait_if_global_read_lock(session, 0, 1)))
 
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  {
 
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    return true;
 
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  }
 
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  if (! (res= session->openTablesLock(all_tables)))
 
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  {
 
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    /* Skip first table, which is the table we are inserting in */
 
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    TableList *second_table= first_table->next_local;
 
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    select_lex->table_list.first= (unsigned char*) second_table;
 
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    select_lex->context.table_list=
 
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      select_lex->context.first_name_resolution_table= second_table;
 
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    res= mysql_insert_select_prepare(session);
 
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    if (! res && (sel_result= new select_insert(first_table,
 
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                                                first_table->table,
 
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                                                &session->lex->field_list,
 
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                                                &session->lex->update_list,
 
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                                                &session->lex->value_list,
 
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                                                session->lex->duplicates,
 
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                                                session->lex->ignore)))
 
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    {
 
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      res= handle_select(session, 
 
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                         session->lex, 
 
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                         sel_result, 
 
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                         OPTION_SETUP_TABLES_DONE);
 
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      /*
 
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         Invalidate the table in the query cache if something changed
 
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         after unlocking when changes become visible.
 
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         TODO: this is a workaround. right way will be move invalidating in
 
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         the unlock procedure.
 
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       */
 
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      if (first_table->lock_type == TL_WRITE_CONCURRENT_INSERT &&
 
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          session->lock)
 
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      {
 
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        /* INSERT ... SELECT should invalidate only the very first table */
 
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        TableList *save_table= first_table->next_local;
 
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        first_table->next_local= 0;
 
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        first_table->next_local= save_table;
 
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      }
 
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      delete sel_result;
 
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    }
 
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    /* revert changes for SP */
 
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    select_lex->table_list.first= (unsigned char*) first_table;
 
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  }
 
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  /*
 
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     Release the protection against the global read lock and wake
 
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     everyone, who might want to set a global read lock.
 
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   */
 
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  start_waiting_global_read_lock(session);
 
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  return res;
 
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}