多条件等关系的子查询如何写jpql查询

Question

我想通过 JPQL.I 触发以下查询，我是 JPA 的新手，正在学习 JPQL，但遇到了这个查询。

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

这里性别和名字参数是动态传递的，这里我保持静态。

我的 Classes 片段是：这是我的用户 class
用户Class:

@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 class 与用户 class 具有一对一关系并且连接列是用户 ID。

申请人Class:

@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

你想通过 LEFT JOIN 实现的目标是不是可以实现：

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%');

或不在：

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，您可能应该从那里开始找到答案。

Answer 2

JPQL 查询 SQL

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

下一个：

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();

多条件等关系的子查询如何写jpql查询

How to write jpql query for subquery with multiple conditions and other relationships

postgresql

jpa

hql

jpql