1.一对多双向关联(班级对学生):Object,hbm

最新推荐文章于 2022-10-02 00:02:52 发布

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最新推荐文章于 2022-10-02 00:02:52 发布

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分类专栏： Hibernate

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本文深入解析了使用 Java 和 Hibernate 框架实现的两个实体类 Classes 和 Student 的定义及其对应的映射文件，展示了如何通过 ORM（对象关系映射）技术将 Java 对象与数据库表进行映射。

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package com.bjpowernode.hibernate;

import java.util.Set;

public class Classes {
	
	private int id;
	
	private String name;
	
	private Set students;

	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 Set getStudents() {
		return students;
	}

	public void setStudents(Set students) {
		this.students = 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;
	
	private Classes classes;

	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 Classes getClasses() {
		return classes;
	}

	public void setClasses(Classes classes) {
		this.classes = classes;
	}
}

<?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"/>
		<many-to-one name="classes" column="classesid"/>
	</class>
</hibernate-mapping>