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