~drizzle-trunk/drizzle/development

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-

 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:

 *

 *  Copyright (C) 2008 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; version 2 of the License.

 *

 *  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

 */

#pragma once

#include <drizzled/plugin/client.h>

#include <drizzled/plugin/query_cache.h>

#include <drizzled/plugin/transactional_storage_engine.h>

#include <drizzled/select_result.h>

#include <drizzled/sql_lex.h>

#include <drizzled/open_tables_state.h>

namespace drizzled {

class select_send : public select_result 

{

public:

  bool send_eof()

  {

    /*

      We may be passing the control from mysqld to the client: release the

      InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved

      by session

    */

    plugin::TransactionalStorageEngine::releaseTemporaryLatches(session);

    /* Unlock tables before sending packet to gain some speed */

    if (session->open_tables.lock)

    {

      session->unlockTables(session->open_tables.lock);

      session->open_tables.lock= 0;

    }

    session->my_eof();

    return false;

  }

  void send_fields(List<Item>& list)

  {

    session->getClient()->sendFields(list);

  }

  /* Send data to client. Returns 0 if ok */

  bool send_data(List<Item>& items)

  {

    if (unit->offset_limit_cnt)

    {						// using limit offset,count

      unit->offset_limit_cnt--;

      return false;

    }

    /*

      We may be passing the control from mysqld to the client: release the

      InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved

      by session

    */

    plugin::TransactionalStorageEngine::releaseTemporaryLatches(session);

    List<Item>::iterator li(items.begin());

    char buff[MAX_FIELD_WIDTH];

    String buffer(buff, sizeof(buff), &my_charset_bin);

    while (Item* item= li++)

    {

      item->send(session->getClient(), &buffer);

    }

    /* Insert this record to the Resultset into the cache */

    /*

    if (session->query_cache_key != "" && session->getResultsetMessage() != NULL)

      plugin::QueryCache::insertRecord(session, items);

    */

    session->sent_row_count++;

    if (session->is_error())

      return true;

    return session->getClient()->flush();

  }

};

} /* namespace drizzled */