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