Hibernate Annotation级联操作不成功,求解?

最新推荐文章于 2022-07-05 22:38:30 发布

最新推荐文章于 2022-07-05 22:38:30 发布 · 154 阅读

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探讨了在使用双向一对多关系映射时遇到的问题：通过级联操作未能成功将两个UserMember对象与一个School对象关联并保存至数据库。分析了可能的原因及解决思路。

1, 对象关系说明:
School对UserMember是一对多关系:
====================================================
2, 相关类说明:

----School类----

private List<UserMember> users = new ArrayList<UserMember>();
@OneToMany(mappedBy = "school",cascade = {CascadeType.PERSIST,CascadeType.REFRESH}, fetch = FetchType.LAZY, targetEntity =
UserMember.class)
public List getUsers() {
return users;
}

----UserMember类----

private School school;
@ManyToOne(cascade = { CascadeType.REFRESH},fetch=FetchType.LAZY)
@JoinColumn(name = "schoolId")
public SchoolInfo getSchool() {
return school;
}
//注意这里,郁闷的是双向关联时,关联的主键的insert,update操作必须设定为false
@Column(name = "schoolId", insertable = false, updatable = false, nullable = true, length = 36)
public String getSchoolId() {
return this.schoolId;
}

====================================================
3, 持久化操作:
备注:member1和member2都是新实例化的,并且注入有数据

member1.setSchool(school);
member2.setSchool(school);
List<UserMember> users=new ArrayList<UserMember>();
users.add(member1);
users.add(member2);
school.setUsers(users);
this.schoolService.create(this.school);

====================================================
4, 问题:
1,本来预期上面操作会同时insert 2条用户信息到数据库,但结果是只插入了school信息.我把关联改为单向也不行.级联好像没起作用.求解????
2,我配置的为双向一对多关系,保存用户信息时,必须member.setSchool(school)才能保存进去数据,直接member.setSchoolId(" ");好像不行,求解????