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Current File : /proc/2717185/root/proc/self/root/usr/include/mysql/server/private//sql_truncate.h
#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 02110-1335  USA */

class THD;
struct TABLE_LIST;

/**
  Sql_cmd_truncate_table represents the TRUNCATE statement.
*/
class Sql_cmd_truncate_table : public Sql_cmd
{
private:
  /* Set if a lock must be downgraded after truncate is done. */
  MDL_ticket *m_ticket_downgrade;

public:
  /**
    Constructor, used to represent a TRUNCATE statement.
  */
  Sql_cmd_truncate_table() = default;

  virtual ~Sql_cmd_truncate_table() = default;

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

  enum_sql_command sql_command_code() const override
  {
    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

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