Spring Data JPA：查询ManyToMany [英] Spring Data JPA: query ManyToMany

问题描述

我有实体用户和测试

@Entity
public class User {
    private Long id;
    private String userName;
}

@Entity
public class Test {
    private Long id;

    @ManyToMany
    private Set<User> users;
}

我可以通过用户实体获得所有测试：

I can get all tests by User entity:

public interface TestRepository extends JpaRepository<EventSettings, Long> {
    List<Test> findAllByUsers(User user);
}

但是我可以使用哪个查询来查找的userName ？

But which query can I use for finding all tests by userName?

推荐答案

您希望获得以下方法签名：

The following method signature will get you want to want:

List<Test> findByUsers_UserName(String userName)

这是使用属性表达式功能。签名 Users_UserName 将被转换为JPQL x.users.userName 。请注意，这将在给定的用户名上执行完全匹配。

This is using the property expression feature of Spring Data JPA. The signature Users_UserName will be translated to the JPQL x.users.userName. Note that this will perform an exact match on the given username.

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