Question

我正在尝试为belos提供表结构的实体

(id, name, task, leader_id)

此表提供有关特定任务的团队用户及其团队负责人的信息。

我写了这样的实体

@Column(name = "id", insertable = false, nullable = false, updatable = true)
private Integer id;

@Col umn(name = "name", nullable = false)
private String tokenName;

@Column(name = "task", nullable = false)
private String task;

@ManyToOne(cascade = ALL, fetch = LAZY)
@JoinColumn(name = "leader_id")
private User leader;

我通过hibernate3：hbm2ddl创建了ddl，它看起来像这样

alter table user
drop
foreign key FK60FD5D6395C4EEC2;

drop table if exists user;

create table user (
    id integer not null auto_increment,
    task varchar(255),
    name varchar(255) not null,
    leader_id integer,
    primary key (id)
);

alter table user
    add index FK60FD5D6395C4EEC2 (leader_id),
    add constraint FK60FD5D6395C4EEC2
    foreign key (leader_id)
    references user (id);

通过maven-sql-plugin导出此架构时，我收到以下错误

[ERROR] Failed to execute:
alter table user
drop
foreign key FK60FD5D6395C4EEC2
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] Column "FOREIGN" not found; SQL statement:

alter table user
drop
foreign key FK60FD5D6395C4EEC2 [42122-158]

我做错了什么？

Answer 1

试试这个：

@ManyToOne(cascade = ALL, fetch = LAZY)
@JoinColumn(name = "leader_id")
@NotFound(action = NotFoundAction.IGNORE) 
public User getLeader()
{
  return leader;
}

使用JPA的多对一实体

1 个答案: