/* Copyright (c) 2006, 2015, 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, version 2.0,
   as published by the Free Software Foundation.

   This program is also distributed with certain software (including
   but not limited to OpenSSL) that is licensed under separate terms,
   as designated in a particular file or component or in included license
   documentation.  The authors of MySQL hereby grant you an additional
   permission to link the program and your derivative works with the
   separately licensed software that they have included with MySQL.

   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, version 2.0, 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 */

#ifndef SQL_DELETE_INCLUDED
#define SQL_DELETE_INCLUDED

#include "my_base.h"     // ha_rows
#include "sql_class.h"   // Query_result_interceptor
#include "sql_cmd_dml.h" // Sql_cmd_dml

class THD;
class Unique;
struct TABLE_LIST;

bool mysql_prepare_delete(THD *thd);
bool mysql_delete(THD *thd, ha_rows rows);
int mysql_multi_delete_prepare(THD *thd, uint *table_count);

class Query_result_delete :public Query_result_interceptor
{
  TABLE_LIST *delete_tables;
  /// Pointers to temporary files used for delayed deletion of rows
  Unique **tempfiles;
  /// Pointers to table objects matching tempfiles
  TABLE **tables;
  ha_rows deleted, found;
  uint num_of_tables;
  int error;
  /// Map of all tables to delete rows from
  table_map delete_table_map;
  /// Map of tables to delete from immediately
  table_map delete_immediate;
  // Map of transactional tables to be deleted from
  table_map transactional_table_map;
  /// Map of non-transactional tables to be deleted from
  table_map non_transactional_table_map;
  /// True if some delete operation has been performed (immediate or delayed)
  bool do_delete;
  /// True if some actual delete operation against non-transactional table done
  bool non_transactional_deleted;
  /*
     error handling (rollback and binlogging) can happen in send_eof()
     so that afterward send_error() needs to find out that.
  */
  bool error_handled;

public:
  Query_result_delete(TABLE_LIST *dt, uint num_of_tables);
  ~Query_result_delete();
  virtual bool need_explain_interceptor() const { return true; }
  int prepare(List<Item> &list, SELECT_LEX_UNIT *u);
  bool send_data(List<Item> &items);
  bool initialize_tables (JOIN *join);
  void send_error(uint errcode,const char *err);
  int do_deletes();
  int do_table_deletes(TABLE *table);
  bool send_eof();
  inline ha_rows num_deleted()
  {
    return deleted;
  }
  virtual void abort_result_set();
};


class Sql_cmd_delete : public Sql_cmd_dml
{
public:
  virtual enum_sql_command sql_command_code() const { return SQLCOM_DELETE; }

  virtual bool execute(THD *thd);

  virtual bool prepared_statement_test(THD *thd);
  virtual bool prepare(THD *thd)
  {
    // TODO: move the mysql_prepare_delete() call there
    return false;
  }

private:
  bool mysql_prepare_delete(THD *thd);
  bool mysql_delete(THD *thd, ha_rows rows);
};


class Sql_cmd_delete_multi : public Sql_cmd_dml
{
public:
  virtual enum_sql_command sql_command_code() const
  {
    return SQLCOM_DELETE_MULTI;
  }

  virtual bool execute(THD *thd);

  virtual bool prepared_statement_test(THD *thd);
  virtual bool prepare(THD *thd)
  {
    uint table_count;
    return mysql_multi_delete_prepare(thd, &table_count);
  }

private:
  int mysql_multi_delete_prepare(THD *thd, uint *table_count);
};


#endif /* SQL_DELETE_INCLUDED */
