/**
  * Generates all the class migration defitions for certain database setup
  *
  * @param	string $version
  * @param	string $exportData
  * @return	string
  */
 public function generateAll($version, $exportData = null)
 {
     $classDefinition = array();
     foreach (self::$_connection->listTables() as $table) {
         $classDefinition[$table] = self::generate($version, $table, $exportData);
     }
     return $classDefinition;
 }