Hibernate多对一外键单向关联(Annotation配置)

[align=left]package edu.xaut.hibernate;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="t_group")
public class Group {
private int id;
private String name;

@Id
@GeneratedValue
public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

@Column(length = 20)
public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
}

package edu.xaut.hibernate;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name="t_user")
public class User {
private int id;
private String name;
private String title;
private Group group;

@Id
@GeneratedValue
public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

@Column(length = 20)
public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

@Column(length = 10)
public String getTitle() {
return title;
}

public void setTitle(String title) {
this.title = title;
}

@ManyToOne
@JoinColumn(name = "groupId")
public Group getGroup() {
return group;
}

public void setGroup(Group group) {
this.group = group;
}
}

生成的SQL语句如下：
create table t_group (
id integer not null auto_increment,
name varchar(20),
primary key (id)
)

create table t_user (
id integer not null auto_increment,
name varchar(20),
title varchar(10),
groupId integer,
primary key (id)
)

alter table t_user
add index FKCB63CCB6D883DE2F (groupId),
add constraint FKCB63CCB6D883DE2F
foreign key (groupId)
references t_group (id)[/align]

from:http://blog.sina.com.cn/s/blog_4979ec3e0101754x.html