/**
* Retrieve object using using composite pkey values.
* @param int $id_session
* @param string $course_code
* @param int $id_user
* @param PropelPDO $con
* @return SessionRelCourseRelUser
*/
public static function retrieveByPK($id_session, $course_code, $id_user, PropelPDO $con = null)
{
$_instancePoolKey = serialize(array((string) $id_session, (string) $course_code, (string) $id_user));
if (null !== ($obj = SessionRelCourseRelUserPeer::getInstanceFromPool($_instancePoolKey))) {
return $obj;
}
if ($con === null) {
$con = Propel::getConnection(SessionRelCourseRelUserPeer::DATABASE_NAME, Propel::CONNECTION_READ);
}
$criteria = new Criteria(SessionRelCourseRelUserPeer::DATABASE_NAME);
$criteria->add(SessionRelCourseRelUserPeer::ID_SESSION, $id_session);
$criteria->add(SessionRelCourseRelUserPeer::COURSE_CODE, $course_code);
$criteria->add(SessionRelCourseRelUserPeer::ID_USER, $id_user);
$v = SessionRelCourseRelUserPeer::doSelect($criteria, $con);
return !empty($v) ? $v[0] : null;
}
