IN clause with a composite primary key in JPA criteria

Question

I have a table named group_table in MySQL with only two columns user_group_id and group_id (both of them are of type VARCHAR

Answer 1

Try this

        CriteriaBuilder cb = entityManager.getCriteriaBuilder();
        CriteriaQuery cq = cb.createQuery(GroupTable.class);
        Root r = cq.from(GroupTable.class);
        Expression exp = r.get("id"); //EntityPK is your primary composite key class and id is the property name of primary key in GroupTable entity
        Predicate predicate = exp.in(list);
        cq.select(r).where(predicate);

        entityManager.createQuery(cq).getResultList();

I have a following table with below structure

create table EntityA (
        col1 integer not null,
        col2 integer not null,
        description varchar(255),
        primary key (col1, col2)
    )

Following are the entity and composite key classes

@Entity
public class EntityA implements Serializable {

    @EmbeddedId
    private EntityPK id;
    private String description;

// getters, setteres    
    ...........................
    ............................


    }


@Embeddable
public class EntityPK implements Serializable {

    private int col1;
    private int col2;

// getters, setters, hashcode, equals etc

My test code is

 CriteriaBuilder cb = em.getCriteriaBuilder();
        CriteriaQuery cq = cb.createQuery(EntityA.class);
        Root r = cq.from(EntityA.class);
        Expression exp = r.get("id");
        Predicate predicate = exp.in(list);
        cq.select(r).where(predicate);
        em.createQuery(cq).getResultList();

The resulting SQL is

select
        entitya0_.col1 as col1_0_,
        entitya0_.col2 as col2_0_,
        entitya0_.description as descript3_0_ 
    from
        EntityA entitya0_ 
    where
        entitya0_.col1=? 
        and entitya0_.col2=? 
        or entitya0_.col1=? 
        and entitya0_.col2=? 
        or entitya0_.col1=? 
        and entitya0_.col2=?