您的位置：首页 > 其它

HIbernate级联删除(hibernate 双向一对多中 主表设置cascade="all-delete-orphan"，在save时出现

2009-10-22 00:44 555 查看
数据库为：Oracle 9i

主表为： 用户表（member）

create
table member (

member_id number(10,0) not null,

name varchar2(10 char),

sex varchar2(1 char),

primary key (member_id)

)

从表为：
订单表（orders）

create table orders (

Order_id number(10,0) not null,

total_price float,

member_id number(10,0),

primary key (Order_id)

)

alter table orders

add constraint FKC3DF62E5CDAA53AA

foreign
key (member_id)

references member

双向关联映射细分：

在主表member的关系映射文件中：

1）一端（member）中对多端（order）采取了延迟加载策略：lazy="true"默认

2）将多端（order）的传播持久性（级联）设置为最全面的全部级联（包括孤儿模式）：cascade="all-delete-orphan"

3）将维护关系的控制权交给多端（order）：inverse="true"

在从表orders的关系映射文件中：

1）多端（order）对一端（member）采取了预先抓取策略：fetch="join"（并且要把一端‘member’映射文件的class标签的lazy属性设置为false）

2）将一端（member）的传播持久性（级联）设置为存储、更新：cascade="save-update"

用户表member(主表)：

<hibernate-mapping>

<class
name="hbp.ch04.ex03.model.Member" table="member" lazy="false">

<id
name="memberId" column="member_id" type="java.lang.Integer">

<generator class="native"> </generator>

</id>

<property name="name" column="name" type="java.lang.String"
length="10"> </property>

<property name="sex" column="sex"
type="java.lang.String" length="1"> </property>

<set
name="orders" order-by="order_id" inverse="true" lazy="true"
cascade="all-delete-orphan">

<key column="member_id"> </key>

<one-to-many class="hbp.ch04.ex03.model.Order"/>

</set>

</class>

</hibernate-mapping>

订单表orders（从表）

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"

"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<!--

Mapping file autogenerated by MyEclipse - Hibernate Tools

-->

<hibernate-mapping>

<class name="hbp.ch04.ex03.model.Order"
table="orders">

<id name="orderId" column="Order_id"
type="java.lang.Integer">

<generator class="native">
</generator>

</id>

<property name="totalPrice"
column="total_price" type="java.lang.Float"> </property>

<many-to-one name="member" column="member_id"
class="hbp.ch04.ex03.model.Member" cascade="save-update" fetch="join">
</many-to-one>

</class>

</hibernate-mapping>

pojo类：

Member------------------------

import
java.util.HashSet;

import java.util.Set;

public class Member {

// Fields

private Integer memberId;

private String name;

private String sex;

private Set orders;

// Constructors

/**
default constructor */

public Member() {

// TODO Auto-generated
constructor stub

}

// Property accessors

/**

* @return
the orders

*/

public Set getOrders() {

if (orders == null) {

orders = new HashSet();

}

return orders;

}

// 其他
get/set访问方法省略。。。。。

}

Order-----------------

public class Order {

// Fields

}

Member的DAO类（DAO实现的接口省略。。。）

import org.hibernate.*;

import util.HibernateSessionFactory;

import hbp.dao.MemberDAO;

import hbp.model.Member;

import
hbp.model.Order;

public class HibernateMemberDAO implements MemberDAO {

public void deleteMember(Integer memberId) {

// TODO Auto-generated
method stub

Session session = HibernateSessionFactory.getSession();

session.beginTransaction();

Member member =
(Member)session.get(Member.class, memberId);

session.delete(member);

session.getTransaction().commit();

session.close();

}

public Member getMemberById(Integer memberId) {

// TODO
Auto-generated method stub

Session session =
HibernateSessionFactory.getSession();

session.beginTransaction();

Member member = (Member)session.get(Member.class, memberId);

//Hibernate.initialize(member.getOrders());

session.getTransaction().commit();

return member;

}

public Order getOrderById(Integer orderId) {

// TODO Auto-generated
method stub

Session session = HibernateSessionFactory.getSession();

session.beginTransaction();

Order
order=(Order)session.get(Order.class, orderId);

//Hibernate.initialize(order.getMember());

session.getTransaction().commit();

return order;

}

public
void saveMember(Member member) {

// TODO Auto-generated method stub

Session session = HibernateSessionFactory.getSession();

session.beginTransaction();

session.save(member);

session.getTransaction().commit();

}

public void
saveOrder(Integer memberId, Order order) {

// TODO Auto-generated method
stub

Session session = HibernateSessionFactory.getSession();

session.beginTransaction();

Member member =
(Member)session.get(Member.class, memberId);

order.setMember(member);

member.getOrders().add(order);

session.save(member);

session.getTransaction().commit();

}

public void
delete_orphan(Member member,Order order) {

Session session =
HibernateSessionFactory.getSession();

session.beginTransaction();

member.getOrders().remove(order);

session.save(member);

session.getTransaction().commit();

}

}

测试方法：

import java.util.HashSet;

import
hbp.dao.hibernate.HibernateMemberDAO;

import hbp.model.Member;

import
hbp.model.Order;

import junit.framework.TestCase;

public class
HibernateMemberDAO03Test extends TestCase {

public void
testSaveMember(){

HibernateMemberDAO memberDAO = new HibernateMemberDAO();

Member member, member2, member3;

member = new Member();

member.setName("李四");

member.setSex("f");

member.setOrders(new
HashSet());

memberDAO.saveMember(member);

member2 = new Member();

member2.setName("王五");

member2.setSex("m");

member2.setOrders(new
HashSet());

memberDAO.saveMember(member2);

member3 = new Member();

member3.setName("张三");

member3.setSex("m");

member3.setOrders(new
HashSet());

memberDAO.saveMember(member3);

}

public void
testSaveOrder() {

HibernateMemberDAO memberDAO = new HibernateMemberDAO();

Order order = new Order();

order.setTotalPrice(new Float(12.34));

memberDAO.saveOrder(new Integer(3), order);

}

public void
testGetMemberById() {

HibernateMemberDAO memberDAO = new
HibernateMemberDAO();

Member member = memberDAO.getMemberById(new
Integer(3));

System.out.println("会员姓名：" + member.getName());

System.out.println("订单数量：" + member.getOrders().size());

}

public void testGetOrderById() {

HibernateMemberDAO memberDAO = new
HibernateMemberDAO();

Order order = memberDAO.getOrderById(new Integer(4));

System.out.println("会员姓名：" + order.getMember().getName());

System.out.println("订单价格：" + order.getTotalPrice());

}

public void testDeleteMember() {

/*

HibernateMemberDAO memberDAO = new HibernateMemberDAO();

memberDAO.deleteMember(new Integer(2));

memberDAO.deleteMember(new
Integer(3));

*/

HibernateMemberDAO memberDAO = new
HibernateMemberDAO();

Member member = memberDAO.getMemberById(new
Integer(3));

Order order = memberDAO.getOrderById(new Integer(4));

memberDAO.delete_orphan(member, order);

}

}
http://hi.baidu.com/farmer521/blog/item/efb87e86a70a342dc65cc3ca.html
内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理 点击这里给我发消息
标签： 
相关文章推荐
新的分享
章节导航