~drizzle-trunk/drizzle/development : contents of drizzled/statement.h at revision 2180

~drizzle-trunk/drizzle/development : (revision 2180)

/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
 *
 *  Copyright (C) 2009 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; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  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
 */

#ifndef DRIZZLED_STATEMENT_H
#define DRIZZLED_STATEMENT_H

#include <drizzled/definitions.h>
#include <drizzled/error.h>
#include <drizzled/sql_parse.h>
#include <drizzled/sql_base.h>
#include <drizzled/show.h>

namespace drizzled
{

class Session;
class TableList;
class Item;

namespace statement
{

/**
 * @class Statement
 * @brief Represents a statement to be executed
 */
class Statement
{
public:
  Statement(Session *in_session) : 
    _session(in_session)
  {}

  virtual ~Statement() {}

  /**
   * Execute the statement.
   *
   * @return true on failure; false on success
   */
  virtual bool execute()= 0;

  /* True if can be in transaction. Currently only DDL is not.
     This should go away when DDL commands are within transactions. */
  virtual bool isTransactional()
  {
    return false;
  }

  Session *getSession()
  {
    return _session;
  }

  Session *getSession() const
  {
    return _session;
  }

  virtual bool isShow() { return false; }

private:
  /**
   * A session handler.
   */
  Session *_session;
};

} /* namespace statement */

} /* namespace drizzled */

#endif /* DRIZZLED_STATEMENT_H */

1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	1	/* -- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; --
	2	* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
	3	*
1999.6.1 by kalebral at gmail update Copyright strings to a more common format to help with creating the master debian copyright file	4	* Copyright (C) 2009 Sun Microsystems, Inc.
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License as published by
	8	* the Free Software Foundation; either version 2 of the License, or
	9	* (at your option) any later version.
	10	*
	11	* This program is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	14	* GNU General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU General Public License
	17	* along with this program; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	19	*/
	20
1100.3.30 by Padraig O'Sullivan Renamed the Command class to be Statement. Renamed the command directory to	21	#ifndef DRIZZLED_STATEMENT_H
	22	#define DRIZZLED_STATEMENT_H
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	23
	24	#include <drizzled/definitions.h>
	25	#include <drizzled/error.h>
	26	#include <drizzled/sql_parse.h>
	27	#include <drizzled/sql_base.h>
	28	#include <drizzled/show.h>
	29
1280.1.10 by Monty Taylor Put everything in drizzled into drizzled namespace.	30	namespace drizzled
	31	{
	32
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	33	class Session;
	34	class TableList;
	35	class Item;
	36
1100.3.28 by Padraig O'Sullivan Renamed the command namespace where I was declaring all of these commands to	37	namespace statement
1100.3.4 by Padraig O'Sullivan Updates based on code review from Jay.	38	{
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	39
	40	/**
1100.3.30 by Padraig O'Sullivan Renamed the Command class to be Statement. Renamed the command directory to	41	* @class Statement
1100.3.28 by Padraig O'Sullivan Renamed the command namespace where I was declaring all of these commands to	42	* @brief Represents a statement to be executed
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	43	*/
1100.3.30 by Padraig O'Sullivan Renamed the Command class to be Statement. Renamed the command directory to	44	class Statement
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	45	{
	46	public:
2073.1.2 by Brian Aker Basic DDL for catalog.	47	Statement(Session *in_session) :
2098.4.1 by Brian Aker Make session encapsulated.	48	_session(in_session)
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	49	{}
	50
1100.3.30 by Padraig O'Sullivan Renamed the Command class to be Statement. Renamed the command directory to	51	virtual ~Statement() {}
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	52
	53	/**
1100.3.28 by Padraig O'Sullivan Renamed the command namespace where I was declaring all of these commands to	54	* Execute the statement.
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	55	*
1100.3.25 by Padraig O'Sullivan Changed return type of the execute() function in Command classes to be bool	56	* @return true on failure; false on success
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	57	*/
1100.3.25 by Padraig O'Sullivan Changed return type of the execute() function in Command classes to be bool	58	virtual bool execute()= 0;
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	59
2140.2.6 by Stewart Smith be sure to start a transaction with a startTransaction call on the first statement when autocommit is OFF. The only statements that DO NOT do this are a) DDL and b) SELECT without a table (e.g. SELECT DATABASE() and SHOW STATUS.	60	/* True if can be in transaction. Currently only DDL is not.
	61	This should go away when DDL commands are within transactions. */
	62	virtual bool isTransactional()
	63	{
2140.2.9 by Stewart Smith switch default Statement::isTransactional() to false, have explicit overriding of true where needed.	64	return false;
2140.2.6 by Stewart Smith be sure to start a transaction with a startTransaction call on the first statement when autocommit is OFF. The only statements that DO NOT do this are a) DDL and b) SELECT without a table (e.g. SELECT DATABASE() and SHOW STATUS.	65	}
	66
1835.1.6 by Brian Aker This patch returns dynamic SQL into the core (through SQL-Server syntax).	67	Session *getSession()
	68	{
2098.4.1 by Brian Aker Make session encapsulated.	69	return _session;
1835.1.6 by Brian Aker This patch returns dynamic SQL into the core (through SQL-Server syntax).	70	}
	71
2104.1.1 by Brian Aker Merge in update to use console for catalog DDL.	72	Session *getSession() const
	73	{
	74	return _session;
	75	}
	76
2059.1.1 by Andrew Hutchings Refix show_dictionary plugin crash when not using 'SHOW' to access.	77	virtual bool isShow() { return false; }
	78
2098.4.1 by Brian Aker Make session encapsulated.	79	private:
1100.3.2 by Padraig O'Sullivan Adding doxygen comments to the sql_commands header file.	80	/**
	81	* A session handler.
	82	*/
2098.4.1 by Brian Aker Make session encapsulated.	83	Session *_session;
1100.3.4 by Padraig O'Sullivan Updates based on code review from Jay.	84	};
	85
1280.1.10 by Monty Taylor Put everything in drizzled into drizzled namespace.	86	} /* namespace statement */
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	87
1280.1.10 by Monty Taylor Put everything in drizzled into drizzled namespace.	88	} /* namespace drizzled */
1100.3.1 by Padraig O'Sullivan Beginnings of reworking the mysql_execute_command() method.	89
1100.3.30 by Padraig O'Sullivan Renamed the Command class to be Statement. Renamed the command directory to	90	#endif /* DRIZZLED_STATEMENT_H */