<?php
  /**

   * ownCloud
   *
   * @author Frank Karlitschek
   * @copyright 2012 Frank Karlitschek frank@owncloud.org
   *
   * 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.
   * DB Class
   *
   */
  
  // 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;
  
  /**
   * This class provides access to the internal database system. Use this class exlusively if you want to access databases
   */
  class DB {
  	/**

  	 * Prepare a SQL query

  	 * @param string $query Query string

  	 * @param int $limit Limit of the SQL statement
  	 * @param int $offset Offset of the SQL statement

  	 * @return \MDB2_Statement_Common prepared SQL query
  	 *
  	 * SQL query via MDB2 prepare(), needs to be execute()'d!
  	 */
  	static public function prepare( $query, $limit=null, $offset=null ) {
  		return(\OC_DB::prepare($query, $limit, $offset));
  	}
  
  	/**

  	 * Insert a row if a matching row doesn't exists.

  	 * @param $table string The table name (will replace *PREFIX*) to perform the replace on.
  	 * @param $input array
  	 *
  	 * The input array if in the form:
  	 *
  	 * array ( 'id' => array ( 'value' => 6,
  	 *	'key' => true
  	 *	),
  	 *	'name' => array ('value' => 'Stoyan'),
  	 *	'family' => array ('value' => 'Stefanov'),
  	 *	'birth_date' => array ('value' => '1975-06-20')
  	 *	);
  	 * @return bool
  	 *
  	 */
  	public static function insertIfNotExist($table, $input) {
  		return(\OC_DB::insertIfNotExist($table, $input));
  	}
  
  	/**

  	 * Gets last value of autoincrement

  	 * @param $table string The optional table name (will replace *PREFIX*) and add sequence suffix
  	 * @return int
  	 *
  	 * MDB2 lastInsertID()
  	 *
  	 * Call this method right after the insert command or other functions may
  	 * cause trouble!
  	 */
  	public static function insertid($table=null) {
  		return(\OC_DB::insertid($table));
  	}
  
  	/**

  	 * Start a transaction

  	 */
  	public static function beginTransaction() {
  		return(\OC_DB::beginTransaction());
  	}
  
  	/**

  	 * Commit the database changes done during a transaction that is in progress

  	 */
  	public static function commit() {
  		return(\OC_DB::commit());
  	}
  
  	/**

  	 * Check if a result is an error, works with MDB2 and PDOException

  	 * @param mixed $result
  	 * @return bool
  	 */
  	public static function isError($result) {
  		return(\OC_DB::isError($result));
  	}

  
  	/**
  	 * returns the error code and message as a string for logging
  	 * works with DoctrineException
  	 * @param mixed $error
  	 * @return string
  	 */
  	public static function getErrorMessage($error) {
  		return(\OC_DB::getErrorMessage($error));
  	}

  }