Using Left Joins in HQL on 3 Tables

Question

I have three tables A B and C. Now i want to execute this sql query in HQL:

select * from A as a 
left join 
B as b 
on 
a.id = b.id 
left join 
C as c 
on 
b.t         


        

Answer 1

I suppose you've already defined all the needed associations in your configuration. If so, in HQL it would look like this:

from A as a left join a.B as b left join b.C as c 

There is no "ON" statement in HQL, hibernate does automatically based on your mappings and defined Associations.

Pay attention to a.B and b.C.

You refer to B and C based on already defined aliases a & c.

Answer 2

Use this query

from A as a
left join fetch a.B as b 
left join fetch b.C as c