Question

如何使用注释创建POJO，以便hibernate在映射时创建下表？一列是关注EE，另一列是关注ER。

CREATE TABLE friends(
  id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
  followee_id INT(11) UNSIGNED NOT NULL,
  follower_id INT(11) UNSIGNED NOT NULL,
  start_time TIMESTAMP NOT NULL,
  end_time TIMESTAMP NOT NULL,
  PRIMARY KEY(id),
  KEY idx_fk_friends_followee_id (followee_id),
  KEY idx_fk_friends_follower_id (follower_id),
  CONSTRAINT `fk_friends_followee_id` FOREIGN KEY (followee_id) REFERENCES user (id) ON DELETE RESTRICT ON UPDATE CASCADE,
  CONSTRAINT `fk_friends_follower_id` FOREIGN KEY (follower_id) REFERENCES user (id) ON DELETE RESTRICT ON UPDATE CASCADE
)ENGINE=MyISAM DEFAULT CHARSET=utf8;

Answer 1

我不确定你的问题是什么，因为我觉得这很简单：

@Entity
public class Friend {
  @Id
  private Long id;

  @ManyToOne
  private User follower;

  @ManyToOne
  private User followee;
}

使用来自同一个表的两个外键来Hibernate POJO

1 个答案: