~drizzle-trunk/drizzle/development

/* Copyright (c) 2009 PrimeBase Technologies GmbH, Germany

 *

 * PrimeBase Media Stream for MySQL

 *

 * 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

 *

 * Barry Leslie

 *

 * System variables table.

 *

 */

#ifndef __SYSTAB_VARIABLES_H__

#define __SYSTAB_VARIABLES_H__

#include "cslib/CSMutex.h"

#include "defs_ms.h"

#include "system_table_ms.h"

#include "discover_ms.h"

#define RESTORE_DUMP_VAR "Restoring-Dump"

#define BACKUP_NUMBER_VAR "Backup-Number"

#define VARIABLES_TABLE_NAME "pbms_variable"

class MSVariableTable : public MSOpenSystemTable {

public:

	MSVariableTable(MSSystemTableShare *share, TABLE *table);

	~MSVariableTable();

	void use();

	void unuse();

	void seqScanInit();

	bool seqScanNext(char *buf);

	int	getRefLen() { return sizeof(iVariableIndex);}

	void seqScanPos(uint8_t *pos);

	void seqScanRead(uint8_t *pos, char *buf);

	void updateRow(char *old_data, char *new_data);

	static void saveTable(MSDatabase *db);

	static void loadTable(MSDatabase *db);

	static void transferTable(MSDatabase *from_db, MSDatabase *to_db);

	static void setVariable(MSDatabase *db, const char *name, const char *value);

	static CSStringBuffer *dumpTable(MSDatabase *db);

	static void restoreTable(MSDatabase *db, const char *data, size_t size, bool reload = true);

	static void removeTable(CSString *db_path);

	static const uint8_t tableID = 0X04; // A unique id for the MSVariableTable dump data

	static const uint16_t tableVersion = 0X0001; // The current version of the table

private:

	uint32_t			iVariableIndex;

	static CSLock	gVarLock;

};

extern DT_FIELD_INFO pbms_variable_info[];

extern DT_KEY_INFO pbms_variable_keys[];

#endif // __SYSTAB_VARIABLES_H__