question on Hibernate Criteria API

I have a two table A and B:

A columns (ID,NameA,BiD)
B columns (ID,NameB)  

ID is referenced to Bid as foreign RelationMapping. Here is the problem .My Hibenate B Entity has not got List but My hibernate A entity has got B entity 开发者_StackOverflow社区instance.

select a.* from A a, B b 
where a.BiD=b.ID

How can ı do this query in Hibernate Criteria Api? I hope I can explain my problem?

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You don't need to join the classes in the query. This information is in the mapping file. If you load A's, the B's are loaded (probably lazily) too.

Criteria c = session.createCriteria(A.class).list();

If this answer doesn't help, you forgot to provide some information about the query you need.

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Assuming that what you want is to find all A instances having a specific B ID

Criteria c = session.createCriteria(A.class, "a");
c.add(Restrictions.eq("a.b.id", theIdOfB);
return c.list();

If you had to search on B's name rather than B's ID, you would need a join:

Criteria c = session.createCriteria(A.class, "a");
c.createAlias("a.b", "b");
c.add(Restrictions.eq("b.name", theNameOfB);
return c.list();

As always, all this is explained with examples in the reference documentation.