OpenSQLManager/sys/db/db_sql.php

<?php
/**
 * OpenSQLManager
 *
 * Free Database manager for Open Source Databases
 *
 * @author 		Timothy J. Warren
 * @copyright	Copyright (c) 2012
 * @link 		https://github.com/aviat4ion/OpenSQLManager
 * @license 	http://philsturgeon.co.uk/code/dbad-license
 */

// --------------------------------------------------------------------------

/**
 * Abstract parent for database manipulation subclasses
 */
abstract class DB_SQL {

	/**
	 * Get database-specific sql to create a new table
	 *
	 * @abstract
	 * @param string $name
	 * @param array $columns
	 * @param array $constraints
	 * @param array $indexes
	 * @return string
	 */
	abstract public function create_table($name, $columns, array $constraints=array(), array $indexes=array());

	/**
	 * Get database-specific sql to drop a table
	 *
	 * @abstract
	 * @param string $name
	 * @return string
	 */
	abstract public function delete_table($name);

	/**
	 * Get database specific sql for limit clause
	 *
	 * @abstract
	 * @param string $sql
	 * @param int $limiit
	 * @param int $offset
	 * @return string
	 */
	abstract public function limit($sql, $limit, $offset=FALSE);

	/**
	 * Get the sql for random ordering
	 *
	 * @abstract
	 * @return string
	 */
	abstract public function random();

	/**
	 * Return an SQL file with the database table structure
	 *
	 * @return string
	 */
	abstract public function backup_structure();

	/**
	 * Return an SQL file with the database data as insert statements
	 *
	 * @return string
	 */
	abstract public function backup_data();
}
// End of db_sql.php