JPQL and ON clause basic subquery

Question

In MySQL, This works and I want to achieve equivalent with hibernate:

Select * from A a left join B b on a.id=b.id AND b.lenght=20

There is OneToMany() : Class A contains List <B> b

With hibernate I got stuck on that:

//the ON clause comes from the mapping's join columns and is handled automatically 
@Query(Select a from A a left join a.b c)

but I dont know how to add this part AND b.lenght=20

Hot to translate it to JPQL with JPA?

Answer 1

You can add your condition in the join clause using the WITH keyword

Select a from A a left join a.b with b.lenght = 20

... assuming lenght is a field in B, not the length function.