function rollback(cb) {
  _connection.rollback(function() {
    _connection.release();
    _connection = null;
    cb();
  });
}
/**
 * Rollback the changes of a current transaction
 *
 * @param {function} cb - The callback
 */
Rollback the changes of a current transaction
@param {function} cb - The callback
Rollback the changes of a current transaction @param { function } cb - The callback
function rollback(cb) {
  _connection.rollback(function() {
    _connection.release();
    _connection = null;
    cb();
  });
}
function rollback ( cb ) { _connection . rollback ( function ( ) { _connection . release ( ) ; _connection = null ; cb ( ) ; } ) ; }
Rollback the changes of a current transaction
 @param {function} cb - The callback
Rollback the changes of a current transaction @param { function } cb - The callback