Sql 如何获取具有多对多依赖关系的实体

这是我需要通过当前用户Id获取的项目实体：

@Entity
@Table(name = "project")
public class Project implements Serializable {
  @Id
  @GeneratedValue(strategy = GenerationType.IDENTITY)
  private Long id;

  @ManyToMany
  @JoinTable(name = "project_user",
           joinColumns = @JoinColumn(name="projects_id", referencedColumnName="id"),
           inverseJoinColumns = @JoinColumn(name="users_id", referencedColumnName="id"))
  private Set<User> users = new HashSet<>();
}

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它应该像这样简单

User user = userRepository.findById(100L);
Set<Projects> projects = user.getProjects();

由于您的映射，JPA负责其余的工作

SELECT * FROM project WHERE id IN (SELECT projects_id FROM project_user WHERE users_id = ?);

User user = userRepository.findById(100L);
Set<Projects> projects = user.getProjects();