如何编写具有多个条件和其他关系的子查询的jpql查询

Question

我想通过JPQL触发以下查询。我是JPA的新手和学习JPQL，但坚持在此查询。

SELECT * FROM users 
WHERE userid NOT IN (SELECT userid FROM applicants) 
AND gender = 'MALE' AND (firstname like '%R%' OR lastname like '%S%'); 

这里性别和名称参数是动态传递的，但在这里我保持静态。

我的课表摘录如下： 这是我的用户类
用户类别：

@Table(name = "users") 
public class User{ 

@Id 
@GeneratedValue 
private long userId; 

@Column(unique = true, nullable = false) 
private String email; 

private String firstName; 

private String middleName; 

private String lastName; 

private String gender; 

private Timestamp appliedOn; 
} 

申请人类与用户类OneToOne关系和连接列用户ID。

申请人类：

@Entity 
@Table(name = "applicants") 
public class Applicant{ 

@Id 
private long applicantId; 

@OneToOne 
@JoinColumn(name = "userId") 
private User user; 

@ManyToOne 
@JoinColumn(name = "subCourseId") 
private SubCourse course; 

@ManyToOne 
@JoinColumn(name = "collegeId") 
private College college; 
} 

Answer 1

是不是你想达到与左达到什么JOIN：

SELECT * FROM users 
LEFT JOIN applicants ON users.userid = applicants.userid 
WHERE applicants.userid IS NULL 
AND gender = 'MALE' AND (firstname like '%R%' OR lastname like '%S%'); 

还是一个NOT IN：

SELECT * FROM users 
WHERE userid NOT IN (SELECT userid FROM applicants) 
AND gender = 'MALE' AND (firstname like '%R%' OR lastname like '%S%'); 

如果是的，你应该从那里开始找到你的答案。对于SQL

SELECT * FROM users 
WHERE userid NOT IN (SELECT userid FROM applicants) 
AND gender = 'MALE' AND (firstname like '%R%' OR lastname like '%S%'); 

Answer 2

JPQL查询将是未来：

String jpql = "SELECT us FROM User us WHERE us.userId NOT IN (SELECT appl.user.userId FROM Applicant appl) AND us.gender = ?1 AND (us.firstName LIKE ?2 OR us.lastName LIKE ?3)"; 
Query query = entityManager.createQuery(jqpl); 
query.setParameter(1, "MALE"); 
query.setParameter(2, "%R%"); 
query.setParameter(3, "%S%"); 
query.getResultList();