Hibernate_一对一单向外键关联_XML

XML方式：

假设Student类与StudentCard类，它们之间是一对一的关系。

Student类代码如下:

public class Student {

private int id;
private String name;

private int age;
private String sex;
private boolean good;
public boolean isGood() {
return good;
}
public void setGood(boolean good) {
this.good = good;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}

}

对应的配置文件如下：

<hibernate-mapping>
<class name="com.bjsxt.hibernate.Student" dynamic-update="true">
<id name="id">
<generator class="native"></generator>
</id>

<property name="name"></property>
<property name="age" />
<property name="sex" />
<property name="good" type="yes_no"></property>
</class>

</hibernate-mapping>

 

StudentCart代码如下：

public class StuIdCard {
private int id;
private String num;
private Student student;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getNum() {
return num;
}
public void setNum(String num) {
this.num = num;
}
public Student getStudent() {
return student;
}
public void setStudent(Student student) {
this.student = student;
}

}

对应的配置文件如下

<hibernate-mapping>
<class name="com.bjsxt.hibernate.StuIdCard">
<id name="id">
<generator class="native"></generator>
</id>

<property name="num"/>
<many-to-one name="student" column="studentId" unique="true"></many-to-one>
</class>

</hibernate-mapping>

它们之间的一对一关系是通过 <many-to-one name="student" column="studentId" unique="true"></many-to-one>
来实现的。其中name=""是表示StudentCard的属性名student,column=""是表示这个关系在数据库中的字段名