<?php
/**
 * ownCloud
 *
 * @author Bart Visscher
 * @copyright 2013 Bart Visscher bartv@thisnet.nl
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or any later version.
 *
 * This library 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 AFFERO GENERAL PUBLIC LICENSE for more details.
 *
 * You should have received a copy of the GNU Affero General Public
 * License along with this library.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

/**
 * Public interface of ownCloud for apps to use.
 * DBConnection interface
 *
 */

// use OCP namespace for all classes that are considered public.
// This means that they should be used by apps instead of the internal ownCloud classes
namespace OCP;

/**
 * TODO: Description
 */
interface IDBConnection {
	/**
	 * Used to abstract the owncloud database access away
	 * @param string $sql the sql query with ? placeholder for params
	 * @param int $limit the maximum number of rows
	 * @param int $offset from which row we want to start
	 * @return \Doctrine\DBAL\Driver\Statement The prepared statement.
	 */
	public function prepare($sql, $limit=null, $offset=null);

	/**
	 * Used to get the id of the just inserted element
	 * @param string $table the name of the table where we inserted the item
	 * @return int the id of the inserted element
	 */
	public function lastInsertId($table = null);

	/**
	 * Insert a row if a matching row doesn't exists.
	 * @param string The table name (will replace *PREFIX*) to perform the replace on.
	 * @param array
	 *
	 * The input array if in the form:
	 *
	 * array ( 'id' => array ( 'value' => 6,
	 *	'key' => true
	 *	),
	 *	'name' => array ('value' => 'Stoyan'),
	 *	'family' => array ('value' => 'Stefanov'),
	 *	'birth_date' => array ('value' => '1975-06-20')
	 *	);
	 * @return bool
	 *
	 */
	public function insertIfNotExist($table, $input);

	/**
	 * Start a transaction
	 * @return bool TRUE on success or FALSE on failure
	 */
	public function beginTransaction();

	/**
	 * Commit the database changes done during a transaction that is in progress
	 * @return bool TRUE on success or FALSE on failure
	 */
	public function commit();

	/**
	 * Rollback the database changes done during a transaction that is in progress
	 * @return bool TRUE on success or FALSE on failure
	 */
	public function rollBack();

	/**
	 * Gets the error code and message as a string for logging
	 * @return string
	 */
	public function getError();
}