Question

I have a dynamic search with 25 optional parameters. HQl is not an option. I am using the Criterion API. I have DAO methods that I would like to accept a ‘Restriction’ List that I can build in my service layer such that, when I call my DAO method from the service as follows:

Lits<myPojoClass> = myDAO.getDataByCriterion( <?Restriction List?> )

myDAO.getDataByCriterion could consume the ‘Restriction List’ as follows:

inside the myDAO class

Public List<myPojoClass> getDataByCriterion( <?Restriction List?> restrictionList) {
    Session s = HibernateUtil.currentSession();
    Criteria c = s.createCriteria(myPojo.class)
                  .add(Restrictions ( <?Restriction List?>  );  //attach the list here
    List<myPojoClass> response = c.list();

It seems like somthing you should be able to do. Is it possible to add the restrictions passed into the DAO method

Answer 1

Yes, it’s possible. Your Restriction List should be a regular List of Criterion objects (i.e., List <Criterion>). Just to be clear, if you add them all like your sample code, you’re gonna be doing a conjunction (a series of logical ANDs).

Adding my suggestion to your code gives this:

Public List<myPojoClass> getDataByCriterion( List<Criterion> restrictionList) {
Session s = HibernateUtil.currentSession();
Criteria c = s.createCriteria(myPojo.class);
for (Criterion crit : restrictionList){
    c.add(crit);
}

List<myPojoClass> response = c.list();