Question

I have two Hibernate Entities A and B.
There is a ManyToMany association between A and B.

public class A {
  @ManyToMany(targetEntity=B.class)
  @JoinTable(name = "AB",
    joinColumns = @JoinColumn(name="A_FK"),
    inverseJoinColumns = @JoinColumn(name="B_FK"))  
  private Set<B> collectionOfB = new HashSet<B>();
  // ...
}

public class B {
  // no reference to A
}

I have an array {b1, b2,… ,bn} of B elements.

I need to search all the A elements that are associated to ALL the B elements of the list above (all the elements of {b1, b2,… ,bn} should be in collectionOfB).

So I have to do something like this:

select * from A as a where {b1, b2,... ,bn} in a.collectionOfB 

But this is not possible 🙁

Does anybody have an idea how to deal with this ?

Thanks

Kamran

Answer 1

After some investigation I found out that the easiest way to deal with my problem was to use native SQL through session.createSQLQuery(sql).

With:

sql="select a.* from A a where ...";
for (Long bId: myListOfBcriteria) {
  sql += " and " + bId+ " in (select ab.b_fk from AB ab where ab.a_fk=a.id)";
}

where myListOfBcriteria={b1, b2,... ,bn}.

Perhaps it’s not very ‘nice’ but it works well 🙂

I hope this can help some one,

Kamran