代码如下：
@Entity
public class Husband {
private int id;
private String name;
private int age;
private Wife wife;
@Id
@GeneratedValue
public int getId() {
return id;
}
public String getName() {
return name;
}
@OneToOne
public Wife getWife() {
return wife;
}
public int getAge() {
return age;
}
public void setId(int id) {
this.id = id;
}
public void setName(String name) {
this.name = name;
}
public void setWife(Wife wife) {
this.wife = wife;
}
public void setAge(int age) {
this.age = age;
}
}
为什么age 的NULL值 为NO呢？ 主键只有id啊

NULL为no只是说明不可以为空,必须填写id和age才能插入数据

因为int？？

→_→
　——————————————————————————————Love is ever betrayed ，only fickle just let people remember。 我是七萌　

wife应该注解OneToMany，哈哈，个人觉得楼上说得对，int有默认值0，string默认为空。所以主键age不为空，name外键为空。