Java 如何解决这个Hibernate JPA查询？

我正在尝试使用criteriabuilder构建一个查询

对象结构如下所示 用户->有一个名为“userRoles”的列表…userRoles包含UserRoleEntity类的对象

每个UserRoleEntity都有一个RoleEntity

每个角色都有一个我要筛选的“名称”

所以我现在的问题是：

ListJoin<UserEntity, UserRoleEntity> userRoles = user.joinList("userRoles", JoinType.INNER);

predicates.add(userRoles.get("role").<RoleEntity> get("name").in("abc"));

ListJoin userRoles=user.joinList（“userRoles”，JoinType.INNER）；
add（userRoles.get（“role”）.get（“name”）.in（“abc”）；

但它不起作用。。。有什么建议吗

---

谢谢。

根据代码片段，很难确定错误的确切原因

然而，假设这些实体

@Entity
@Table(name="t_user")
public class UserEntity {

    @Id
    @Column(name="id")
    private Integer id;
    @Column(name="name")
    private String name;
    @OneToMany(mappedBy = "user", cascade = CascadeType.ALL, orphanRemoval = true)
    List<UserRoleEntity> userRoles;

    //...
}


@Entity
@Table(name="t_user_role")
public class UserRoleEntity {
    @Id
    @Column(name="id")
    private Integer id;
    @ManyToOne
    private UserEntity user;
    @OneToOne
    @JoinColumn(name = "role_id")
    private RoleEntity role;

    //...
}

@Entity
@Table(name="t_role")
public class RoleEntity {
    @Id
    @Column(name="id")
    private Integer id;
    @Column(name="name")
    private String name;

    //...
}

---

谢谢如果我想按名字排序呢？这可能吗？

List<UserEntity> findUserByRoleName(String roleName) {
    CriteriaBuilder cb = entityManager.getCriteriaBuilder();
    CriteriaQuery<UserEntity> cq = cb.createQuery(UserEntity.class);

    Root<UserEntity> root = cq.from(UserEntity.class);
    Join<Object, Object> joinUserRole = root.join("userRoles");
    Join<Object, Object> joinRole = joinUserRole.join("role");

    Predicate predicateRoleName = cb.equal(joinRole.get("name"), roleName);
    cq.where(predicateRoleName);

    TypedQuery<UserEntity> query = entityManager.createQuery(cq);
    return query.getResultList();
}

select userentity0_.id as id1_2_, userentity0_.name as name2_2_
    from t_user userentity0_
    inner join t_user_role userroles1_ on userentity0_.id=userroles1_.user_id
    inner join t_role roleentity2_ on userroles1_.role_id=roleentity2_.id
    where roleentity2_.name=?