Question

I have defined a JPA entity “A” with a @ManyToOne relationship to another JPA entity “B”.

@Entity
class A {

    String name;

    int sortOrder

    @ManyToOne
    B b;

}

This reference can be null or it can be populated. Now, I would like to query all the As and sort by B.name. Unfortunately, something like

find("order by B.name, sortOrder, name")

seems to drop any As such that (A.b = null). What is the best way to write this query?

I want all the As and I want them sorted by their B.name reference if it exists … lumping all those with no B property together.

Answer 1

you need a left join.

select a from A a left join a.b b order by b.name, a.sortOder, a.name

or something like that.