Hibernate一对多

一对多单向关联(班级对学生)

• 还有一种情况：多对一

package com.bjpowernode.hibernate;
 
import java.util.Set;
 
public class Classes {
	
	private int id;
	
	private String name;
	
	private Set students;
	
}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="com.bjpowernode.hibernate.Classes" table="t_classes">
		<id name="id">
			<generator class="native"/>
		</id>
		<property name="name"/>
		<set name="students">
			<!-- 
			<key column="classesid" not-null="true"/>
			 -->
			 <key column="classesid"/>
			<one-to-many class="com.bjpowernode.hibernate.Student"/>
		</set>
	</class>
</hibernate-mapping>

package com.bjpowernode.hibernate;
 
public class Student {
 
	private int id;
	
	private String name;
}

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC 
	"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
	"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
	<class name="com.bjpowernode.hibernate.Student" table="t_student">
		<id name="id">
			<generator class="native"/>
		</id>
		<property name="name"/>
	</class>
</hibernate-mapping>

具体可看以下两个链接 

https://www.cnblogs.com/goloving/p/7613049.html
https://www.cnblogs.com/goloving/p/7612968.html