我有两个表:ManyToMany关系中的用户和角色。
@Entity
@Table(name = "user")
public class User implements Serializable {
@Id
@Column(name = "user_id")
@GeneratedValue(strategy = GenerationType.AUTO)
private Long userId;
@ManyToMany
@JoinTable(name = "user_role",
joinColumns = @JoinColumn(name = "user_id"),
inverseJoinColumns = @JoinColumn(name = "role_id"))
private Set<Role> roles;
//getters, setters
}
和
@Entity
@Table(name = "role")
public class Role implements Serializable {
@Id
@Column(name = "role_id")
@GeneratedValue(strategy = GenerationType.AUTO)
private Long roleId;
@Column(name = "role_code")
private String roleCode;
@ManyToMany(mappedBy = "roles")
@JsonIgnore
private Set<User> users;
//getters,setters
}
如果用户有角色,我希望选择所有用户和所有HIS角色,例如&#39; ROLE_USER&#39;。
我在原生sql中做过,但我想使用JPQL或CriteriaQuery。
我在JPQL中尝试过(在子查询中将早期的提取类型更改为EAGER,我无法使用连接提取):
public List<User> findUsersByRole(String roleName, int startNumber, int endNumber) {
Query q = em.createQuery("select u from User u join fetch u.roles r WHERE u.userId in (SELECT uu.userId FROM User uu join uu.roles rr WHERE rr.roleCode like :roleName)")
.setParameter("roleName", roleName)
.setFirstResult(startNumber)
.setMaxResults(endNumber);
return q.getResultList();
}
它可以按照我的意愿工作,但是可以不将Fetching类型更改为EAGER吗? 谢谢你的回复。
答案 0 :(得分:0)
你可以这样做:
public List<User> findUsersByRole(String roleName, int startNumber, int endNumber) {
Query q = em.createQuery("select u from User u join fetch u.roles join u.roles r WHERE r.roleCode like :roleName")
.setParameter("roleName", roleName)
.setFirstResult(startNumber)
.setMaxResults(endNumber);
return q.getResultList();
}