#ifndef SQL_TRUNCATE_INCLUDED
#define SQL_TRUNCATE_INCLUDED
/* Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.

 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 */

class THD;
struct TABLE_LIST;

/**
 Sql_cmd_truncate_table represents the TRUNCATE statement.
*/
class Sql_cmd_truncate_table : public Sql_cmd
{
public:
 /**
 Constructor, used to represent a TRUNCATE statement.
 */
 Sql_cmd_truncate_table()
 {}

 virtual ~Sql_cmd_truncate_table()
 {}

 /**
 Execute a TRUNCATE statement at runtime.
 @param thd the current thread.
 @return false on success.
 */
 bool execute(THD *thd);

 virtual enum_sql_command sql_command_code() const
 {
 return SQLCOM_TRUNCATE;
 }

protected:
 enum truncate_result{
 TRUNCATE_OK=0,
 TRUNCATE_FAILED_BUT_BINLOG,
 TRUNCATE_FAILED_SKIP_BINLOG
 };

 /** Handle locking a base table for truncate. */
 bool lock_table(THD *, TABLE_LIST *, bool *);

 /** Truncate table via the handler method. */
 enum truncate_result handler_truncate(THD *, TABLE_LIST *, bool);

 /**
 Optimized delete of all rows by doing a full regenerate of the table.
 Depending on the storage engine, it can be accomplished through a
 drop and recreate or via the handler truncate method.
 */
 bool truncate_table(THD *, TABLE_LIST *);
};

#endif