hibernate级联操作

准备条件：
1． 创建hibernate3工程
2． 导入hibernate的jar包
3． 创建数据库hibernate3,及表customers,orders
一． 一对多双向关联
1. hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

    <session-factory>
    <!-- 
    	<property name="format_sql">true</property>
    -->
    	<property name="show_sql">true</property>

    	<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate3</property>
    	<property name="hibernate.connection.username">root</property>
    	<property name="hibernate.connection.password">root</property>
    	<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    	<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    	<mapping resource="customer.hbm.xml" />
    	<mapping resource="order.hbm.xml" />
    </session-factory>

</hibernate-configuration>

2. Customer.java

package com.hibernate3.bean;

import java.util.Set;

public class Customer {

	private Long id;
	private String name;
	private Set orders;

	public Customer(){

	}
	public Customer(String name,Set orders){
		this.name=name;
		this.orders=orders;
	}

	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Set getOrders() {
		return orders;
	}
	public void setOrders(Set orders) {
		this.orders = orders;
	}

}

3. Order.java

package com.hibernate3.bean;

public class Order {

	private Long id;
	private String orderNumber;
	private Customer customer;

	public Order(){

	}
	public Order(String orderNumber,Customer customer){
		this.orderNumber=orderNumber;
		this.customer=customer;
	}

	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public String getOrderNumber() {
		return orderNumber;
	}
	public void setOrderNumber(String orderNumber) {
		this.orderNumber = orderNumber;
	}
	public Customer getCustomer() {
		return customer;
	}
	public void setCustomer(Customer customer) {
		this.customer = customer;
	}

}

4. Customer.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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.hibernate3.bean.Customer" table="customers">
		<id name="id" column="id" type="long">
			<generator class="increment"></generator>
		</id>
		<property name="name" column="name" type="string"></property>
		<set name="orders" cascade="all" inverse="true" fetch="join" >
			<key column="customer_id"></key>
			<one-to-many class="com.hibernate3.bean.Order"/>
		</set>
	</class>
</hibernate-mapping>

5. Order.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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.hibernate3.bean.Order" table="orders">
		<id name="id" column="id" type="long">
			<generator class="increment"></generator>
		</id>
		<property name="orderNumber" type="string" >
			<column name="order_number" length="15"></column>
		</property>
		<many-to-one name="customer" column="customer_id" class="com.hibernate3.bean.Customer"></many-to-one>
	</class>
</hibernate-mapping>

6. Test.java

package com.hibernate3.bean;

import java.util.HashSet;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class Test {

	private static SessionFactory sessionFactory;

	static{
		try{
			sessionFactory=new Configuration().configure().buildSessionFactory();
		}catch (Exception e) {
			System.out.println("获得sessionFactory出错");
			e.printStackTrace();
		}
	}

	public static void saveCustomerAndOrderWithCascade(){
		Session session=sessionFactory.openSession();
		Transaction tx=null;
		try{
			tx=session.beginTransaction();		

			Customer customer=new Customer("zs",new HashSet());

			Order o1=new Order("no1",customer);
			Order o2=new Order("no2",customer);

			customer.getOrders().add(o1);
			customer.getOrders().add(o2);

			session.save(customer);

			tx.commit();
		}catch(Exception ex){
			System.out.println("保存数据时出错");
			ex.printStackTrace();
			if(tx!=null){
				tx.rollback();
			}
		}finally{
			session.close();
		}
	}

	public static void main(String[] args)
	{
		saveCustomerAndOrderWithCascade();
	}
}

二． 一对多双向自身关联
1. hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

    <session-factory>
    <!-- 
    	<property name="format_sql">true</property>
    -->
    	<property name="show_sql">true</property>

    	<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate3</property>
    	<property name="hibernate.connection.username">root</property>
    	<property name="hibernate.connection.password">root</property>
    	<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    	<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
    	<mapping resource="Category.hbm.xml"/>
    </session-factory>

</hibernate-configuration>

2. Category.java

package com.hibernate3.bean;

import java.util.Set;

public class Category {

	private Long id;
	private String name;
	private Category parentCategory;
	private Set childCategorys;

	public Category(){

	}
	public Category(String name,Category parentCategory,Set childCategorys){
		this.name=name;
		this.parentCategory=parentCategory;
		this.childCategorys=childCategorys;
	}

	public Long getId() {
		return id;
	}
	public void setId(Long id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public Category getParentCategory() {
		return parentCategory;
	}
	public void setParentCategory(Category parentCategory) {
		this.parentCategory = parentCategory;
	}
	public Set getChildCategorys() {
		return childCategorys;
	}
	public void setChildCategorys(Set childCategorys) {
		this.childCategorys = childCategorys;
	}
}

3. Category.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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.hibernate3.bean.Category" table="categories">
		<id name="id" column="id" type="long">
			<generator class="increment"></generator>
		</id>
		<property name="name" column="name" type="string"></property>
		<set name="childCategorys" cascade="all" inverse="true" >
			<key column="category_id"></key>
			<one-to-many class="com.hibernate3.bean.Category"/>
		</set>
		<many-to-one name="parentCategory" column="category_id" class="com.hibernate3.bean.Category"></many-to-one>
	</class>
</hibernate-mapping>

4. Test.java

fpackage com.hibernate3.bean;

import java.util.HashSet;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;

public class Test {

	private static SessionFactory sessionFactory;

	static{
		try{
			sessionFactory=new Configuration().configure().buildSessionFactory();
		}catch (Exception e) {
			System.out.println("获得sessionFactory出错");
			e.printStackTrace();
		}
	}

	public static void saveCategoryWithCascade(){
		Session session=sessionFactory.openSession();
		Transaction tx=null;
		try{
			tx=session.beginTransaction();		

			//食口类别
			Category footCategory=new Category("foot",null,new HashSet());

			//水果类别
			Category fruitCategory=new Category("fruit",null,new HashSet());

			//蔬菜类别
			Category vegetableCategory=new Category("vegetable",null,new HashSet());

			//苹果类别
			Category appleCategory=new Category("apple",null,new HashSet());

			//桔子类别
			Category orangeCategory=new Category("orange",null,new HashSet());

			//西红柿类别
			Category tomatoCategory=new Category("tomato",null,new HashSet());

			footCategory.getChildCategorys().add(fruitCategory);
			fruitCategory.setParentCategory(footCategory);

			footCategory.getChildCategorys().add(vegetableCategory);
			vegetableCategory.setParentCategory(footCategory);

			fruitCategory.getChildCategorys().add(appleCategory);
			appleCategory.setParentCategory(fruitCategory);

			fruitCategory.getChildCategorys().add(orangeCategory);
			orangeCategory.setParentCategory(fruitCategory);

			vegetableCategory.getChildCategorys().add(tomatoCategory);
			tomatoCategory.setParentCategory(vegetableCategory);

			session.save(footCategory);

			tx.commit();
		}catch(Exception ex){
			System.out.println("保存数据时出错");
			ex.printStackTrace();
			if(tx!=null){
				tx.rollback();
			}
		}finally{
			session.close();
		}
	}

	public static void main(String[] args)
	{
		saveCategoryWithCascade();
	}
}

三． 一对一关联
第一种方式：
1． Hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

    <session-factory>
    <!-- 
    	<property name="format_sql">true</property>
    -->
    	<property name="show_sql">true</property>

    	<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate3</property>
    	<property name="hibernate.connection.username">root</property>
    	<property name="hibernate.connection.password">root</property>
    	<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    	<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    	<mapping resource="Certificate.hbm.xml" />
    	<mapping resource="Student.hbm.xml" />
    </session-factory>

</hibernate-configuration>

2． Student.java

package com.hibernate3.bean;

public class Student {

	private String id;          //标识ID
	private String cardId;      //学号
	private String name;        //姓名
	private int age;            //年龄
	private Certificate cer;    //身份证

	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getCardId() {
		return cardId;
	}
	public void setCardId(String cardId) {
		this.cardId = cardId;
	}
	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 Certificate getCer() {
		return cer;
	}
	public void setCer(Certificate cer) {
		this.cer = cer;
	}
}

3． Certificate.java

package com.hibernate3.bean;

public class Certificate {

	private String id;
	private String describe;
	private Student stu;

	public String getId() {
		return id;
	}
	public void setId(String id) {
		this.id = id;
	}
	public String getDescribe() {
		return describe;
	}
	public void setDescribe(String describe) {
		this.describe = describe;
	}
	public Student getStu() {
		return stu;
	}
	public void setStu(Student stu) {
		this.stu = stu;
	}

}

4． Student.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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.hibernate3.bean.Student" table="students">
		<id name="id" column="id" type="string" unsaved-value="null">
			<generator class="uuid"></generator>
		</id>
		<property name="name" column="name" type="string"></property>
		<property name="cardId" column="card_id" type="string"></property>
		<property name="age" column="age" type="integer"></property>
		<one-to-one name="cer" class="com.hibernate3.bean.Certificate" cascade="all" ></one-to-one>
	</class>
</hibernate-mapping>

5． Certificate.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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.hibernate3.bean.Certificate" table="certificates">
		<id name="id" column="id" type="string">
			<generator class="foreign">
				<param name="property">stu</param>
			</generator>
		</id>
		<property name="describe" column="`describe`" type="string"></property>
		<one-to-one name="stu" class="com.hibernate3.bean.Student" constrained="true"
		cascade="none"></one-to-one>
	</class>
</hibernate-mapping>

6． BM.java

package com.hibernate3.bean;

public class BM {

	public static void main(String[] args) {
		Student stu=new Student();
		stu.setName("zs");
		stu.setCardId("123456");
		stu.setAge(33);

		Certificate cer=new Certificate();
		cer.setDescribe("park");

		stu.setCer(cer);
		cer.setStu(stu);

		StudentDAO.saveObj(stu);
	}
}

7． StudentDAO.java

package com.hibernate3.bean;

import org.hibernate.Session;
import org.hibernate.Transaction;

public class StudentDAO {
	static Session session=null;
	static Transaction tx=null;

	public static void saveObj(Object o){
		try{
			session=HibernateUtil.getSession();
			tx=session.beginTransaction();
			session.save(o);
			tx.commit();
		}catch(Exception ex){
			if(tx!=null){
				tx.rollback();
			}
			ex.printStackTrace();
		}finally{
			HibernateUtil.closeSession(session);
		}

	}
}

8． HibernateUtil.java

package com.hibernate3.bean;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

	private static SessionFactory sessionFactory;

	static{
		try{
			sessionFactory=new Configuration().configure().buildSessionFactory();
		}catch(Exception ex){
			System.out.println("获得sessionFactory时出错");
			ex.printStackTrace();
		}
	}

	public static void closeSession(Session session){
		if(session!=null){
			session.close();
		}
	}

	public static Session getSession(){
		Session session=sessionFactory.openSession();
		return session;
	}
}

第二种方式：
与第一种方式基本相同，唯一不同的是以下文件：
1． Certificate.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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.hibernate2.bean.Certificate" table="certificates">
		<id name="id" column="id" type="string">
			<generator class="uuid"></generator>
		</id>
		<property name="describe" column="`describe`" type="string"></property>
		<many-to-one name="stu" column="stu_id" class="com.hibernate2.bean.Student" unique="true"></many-to-one>
	</class>
</hibernate-mapping>

四． 多对多关联
1． Hibernate.cfg.xml

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<!-- Generated by MyEclipse Hibernate Tools.                   -->
<hibernate-configuration>

    <session-factory>
    <!-- 
    	<property name="format_sql">true</property>
    -->
    	<property name="show_sql">true</property>

    	<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/hibernate3</property>
    	<property name="hibernate.connection.username">root</property>
    	<property name="hibernate.connection.password">root</property>
    	<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    	<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

    	<mapping resource="Student.hbm.xml" />
    	<mapping resource="Course.hbm.xml" />
    </session-factory>

</hibernate-configuration>

2． Student.java

package com.hibernate3.bean;

import java.util.Set;

public class Student {

	private String id;
	private String cardId;
	private String name;
	private int age;

	private Set courses;

	public String getId() {
		return id;
	}

	public void setId(String id) {
		this.id = id;
	}

	public String getCardId() {
		return cardId;
	}

	public void setCardId(String cardId) {
		this.cardId = cardId;
	}

	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 Set getCourses() {
		return courses;
	}

	public void setCourses(Set courses) {
		this.courses = courses;
	}


}

3． Course.java

package com.hibernate3.bean;

import java.util.Set;

public class Course {

	private String id;
	private String name;

	private Set students;

	public String getId() {
		return id;
	}

	public void setId(String 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;
	}


}

4． Student.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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.hibernate3.bean.Student" table="students">
		<id name="id" column="id" type="string" unsaved-value="null">
			<generator class="uuid"></generator>
		</id>
		<property name="cardId" column="card_id" type="string"></property>
		<property name="name" column="name" type="string"></property>
		<property name="age" column="age" type="integer"></property>

		<set name="courses" cascade="none" inverse="true" table="student_course" >
			<key column="stu_id"></key>
			<many-to-many class="com.hibernate3.bean.Course" column="course_id"></many-to-many>
		</set>

	</class>
</hibernate-mapping>

5． Course.hbm.xml

<?xml version="1.0" encoding="UTF-8"?>
<!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.hibernate3.bean.Course" table="course">
		<id name="id" column="id" type="string" unsaved-value="null">
			<generator class="uuid"></generator>
		</id>
		<property name="name" column="name" type="string"></property>
		<set name="students" cascade="save-update" table="student_course" >
			<key column="course_id"></key>
			<many-to-many class="com.hibernate3.bean.Student" column="stu_id"></many-to-many>
		</set>

	</class>
</hibernate-mapping>

6． BM.java

package com.hibernate3.bean;

public class BM {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		StudentDAO.mdfChoice();
	}

}

7． StudentDAO.java

package com.hibernate3.bean;

import org.hibernate.Session;
import org.hibernate.Transaction;

public class StudentDAO {

	public static void mdfChoice(){
		Session session=null;
		Transaction tx=null;
		try{
			session=HibernateUtil.getSession();
			tx=session.beginTransaction();
			Student stu=(Student)session.createQuery(
					"from Student as s where s.name='zs'").uniqueResult();
			Course cer=(Course)session.createQuery(
					"from Course as c where c.name='english'").uniqueResult();
			stu.getCourses().add(cer);
			cer.getStudents().add(stu);
			tx.commit();
		}catch(Exception ex){
			if(tx!=null){
				tx.rollback();
			}
			ex.printStackTrace();
		}finally{
			HibernateUtil.closeSession(session);
		}
	}
}

8． HibernateUtil.java

package com.hibernate3.bean;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class HibernateUtil {

	private static SessionFactory sessionFactory;

	static{
		try{
			sessionFactory=new Configuration().configure().buildSessionFactory();
		}catch(Exception ex){
			System.out.println("获得sessionFactory时出错");
			ex.printStackTrace();
		}
	}

	public static void closeSession(Session session){
		if(session!=null){
			session.close();
		}
	}

	public static Session getSession(){
		Session session=sessionFactory.openSession();
		return session;
	}
}