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Viewing changes to drizzled/statement/replace_select.cc

  • Committer: Mark Atwood
  • Date: 2009-03-04 01:02:00 UTC
  • mto: (968.2.20 mordred)
  • mto: This revision was merged to the branch mainline in revision 971.
  • Revision ID: me@mark.atwood.name-20090304010200-t1n4xxdoil2yae9a
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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, Inc.
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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 <config.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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#include <drizzled/select_insert.h>
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namespace drizzled
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{
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bool statement::ReplaceSelect::execute()
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{
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  TableList *first_table= (TableList *) getSession()->getLex()->select_lex.table_list.first;
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  TableList *all_tables= getSession()->getLex()->query_tables;
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  assert(first_table == all_tables && first_table != 0);
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  Select_Lex *select_lex= &getSession()->getLex()->select_lex;
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  Select_Lex_Unit *unit= &getSession()->getLex()->unit;
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  select_result *sel_result= NULL;
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  bool res;
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  if (insert_precheck(getSession(), 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 (getSession()->wait_if_global_read_lock(false, true))
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  {
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    return true;
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  }
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  if (! (res= getSession()->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= insert_select_prepare(getSession());
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    if (! res && (sel_result= new select_insert(first_table,
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                                                first_table->table,
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                                                &getSession()->getLex()->field_list,
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                                                &getSession()->getLex()->update_list,
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                                                &getSession()->getLex()->value_list,
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                                                getSession()->getLex()->duplicates,
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                                                getSession()->getLex()->ignore)))
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    {
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      res= handle_select(getSession(),
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                         getSession()->getLex(),
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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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          getSession()->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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  getSession()->startWaitingGlobalReadLock();
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  return res;
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}
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} /* namespace drizzled */
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