尝试使用merge方法更新对象时，Hibernate会抛出DataIntegrityViolationException

Question

上一个update()方法正在抛出different object with the same identifier value was already associated with the session，因此我将dao更改为merge。现在它给出了org.springframework.dao.DataIntegrityViolationException: could not execute statement; SQL [n/a]; constraint [null]; nested exception is org.hibernate.exception.ConstraintViolationException: could not execute statement

TeamDAOImpl

public void updateTeam(Team team) {
        Team teamToUpdate = getTeam(team.getId());
        teamToUpdate.setName(team.getName());
        teamToUpdate.setRating(team.getRating());
        Set<TeamMember> teamMember = team.getTeamMembers();
        teamToUpdate.setTeamMembers(teamMember);
        getCurrentSession().merge(teamToUpdate);
    }

团队实体

@Entity
@Table(name="teams")
public class Team {


    private Integer id;

    private String name;

    private Integer rating;

    private Set<TeamMember> teamMembers;

// ...
@ManyToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL)
    @JoinTable(name = "team_member", joinColumns =
    @JoinColumn(name = "FK_Team_id", referencedColumnName= "id"),
            inverseJoinColumns = @JoinColumn(name = "FK_Member_id", referencedColumnName = "id")
    )
    public Set<TeamMember> getTeamMembers() {
        return teamMembers;
    }

    public void setTeamMembers(Set<TeamMember> teamMembers) {
        this.teamMembers = teamMembers;
    }
}

Team mas ManyToMany与团队成员的关系。在SQL级别上，它使用表格完成：teams，member，team_member。

违反了哪些约束？如何解决？

更新

CREATE TABLE `member` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(45) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `teams` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(45) NOT NULL,
  `rating` int(11) NOT NULL,
  `FK_Organization_id` int(11) NOT NULL,
  PRIMARY KEY (`id`),
  KEY `FK_Organization_id` (`FK_Organization_id`),
  CONSTRAINT `FK_Organization_id` FOREIGN KEY (`FK_Organization_id`) REFERENCES `organization` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `team_member` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `FK_Member_id` int(11) NOT NULL,
  `FK_Team_id` int(11) NOT NULL,
  PRIMARY KEY (`id`),
  CONSTRAINT `FK_Member_id` FOREIGN KEY (`id`) REFERENCES `member` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `FK_Team_id` FOREIGN KEY (`id`) REFERENCES `teams` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

  

错误o.h.e.jdbc.spi.SqlExceptionHelper - 无法添加或更新子项   row：外键约束失败（db。team_member，   约束FK_Member_id外键（id）参考member   （id）在更新时不执行任何操作（

）

数据：

UPDATE3

public Team getTeam(int id) {
        Team team = (Team) getCurrentSession().get(Team.class, id);
        return team;
    }

UPDATE4 P6Spy帮助发现错误查询：

insert into team_member (FK_Team_id, FK_Member_id) values (2, 2);

返回：

[SQL] insert into team_member (FK_Team_id, FK_Member_id) values (2, 2);
[Err] 1452 - Cannot add or update a child row: a foreign key constraint fails (`db`.`team_member`, CONSTRAINT `FK_Member_id` FOREIGN KEY (`id`) REFERENCES `member` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION)

Answer 1

问题出在team_member表中的 CONSTRAINT 定义中。而不是：

CONSTRAINT `FK_Member_id` FOREIGN KEY (`id`) REFERENCES `member` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `FK_Team_id` FOREIGN KEY (`id`) REFERENCES `teams` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION

必须是

CONSTRAINT `FK_Member_id` FOREIGN KEY (`FK_Member_id`) REFERENCES `member` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION,
  CONSTRAINT `FK_Team_id` FOREIGN KEY (`FK_Team_id`) REFERENCES `teams` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION