Add dropTable to IDBConnection

lib/private/db.php

@@ -263,16 +263,7 @@ class OC_DB {
 	 */
 	public static function dropTable($tableName) {
 		$connection = \OC::$server->getDatabaseConnection();
-		$tableName = OC_Config::getValue('dbtableprefix', 'oc_' ) . trim($tableName);
-
-		$connection->beginTransaction();
-
-		$platform = $connection->getDatabasePlatform();
-		$sql = $platform->getDropTableSQL($platform->quoteIdentifier($tableName));
-
-		$connection->executeQuery($sql);
-
-		$connection->commit();
+		$connection->dropTable($tableName);
 	}
 
 	/**

lib/private/db/connection.php

@@ -164,6 +164,19 @@ class Connection extends \Doctrine\DBAL\Connection implements IDBConnection {
 		return $msg;
 	}
 
+	/**
+	 * Drop a table from the database if it exists
+	 *
+	 * @param string $table table name without the prefix
+	 */
+	public function dropTable($table) {
+		$table = $this->tablePrefix . trim($table);
+		$schema = $this->getSchemaManager();
+		if($schema->tablesExist(array($table))) {
+			$schema->dropTable($table);
+		}
+	}
+
 	// internal use
 	/**
 	 * @param string $statement

lib/public/idbconnection.php

@@ -158,4 +158,11 @@ interface IDBConnection {
 	 * @return \Doctrine\DBAL\Platforms\AbstractPlatform The database platform.
 	 */
 	public function getDatabasePlatform();
+
+	/**
+	 * Drop a table from the database if it exists
+	 *
+	 * @param string $table
+	 */
+	public function dropTable($table);
 }