Query/classes/db_util.php

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<?php
/**
* Query
*
* Free Query Builder / Database Abstraction Layer
*
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* @package Query
* @author Timothy J. Warren
* @copyright Copyright (c) 2012
* @link https://github.com/aviat4ion/Query
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* @license http://philsturgeon.co.uk/code/dbad-license
*/
// --------------------------------------------------------------------------
/**
* Abstract class defining database / table creation methods
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*
* @package Query
* @subpackage Query
*/
abstract class DB_Util {
/**
* Reference to the current connection object
*/
private $conn;
/**
* Save a reference to the connection object for later use
*
* @param object &$conn
*/
public function __construct(&$conn)
{
$this->conn =& $conn;
}
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// --------------------------------------------------------------------------
/**
* Enable calling driver methods
*
* @param string $method
* @param array $args
*/
public function __call($method, $args)
{
if (method_exists($this->conn, $method))
{
return call_user_func_array(array($this->conn, $method), $args);
}
return NULL;
}
// --------------------------------------------------------------------------
// ! Abstract Methods
// --------------------------------------------------------------------------
/**
* 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);
/**
* Return an SQL file with the database table structure
*
* @abstract
* @return string
*/
abstract public function backup_structure();
/**
* Return an SQL file with the database data as insert statements
*
* @abstract
* @return string
*/
abstract public function backup_data();
}