Hibernate逍遥游记-第13章 映射实体关联关系-004双向多对多(inverse="true")
1.
<?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="mypack.Monkey" table="MONKEYS" >
<id name="id" type="long" column="ID">
<generator class="increment"/>
</id> <property name="name" column="NAME" type="string" /> <set name="teachers" table="LEARNING"
lazy="true"
cascade="save-update">
<key column="MONKEY_ID" />
<many-to-many class="mypack.Teacher" column="TEACHER_ID" />
</set> </class> </hibernate-mapping>
2.
<?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="mypack.Teacher" table="TEACHERS" >
<id name="id" type="long" column="ID">
<generator class="increment"/>
</id> <property name="name" column="NAME" type="string" /> <set name="monkeys" table="LEARNING"
lazy="true"
inverse="true"
cascade="save-update">
<key column="TEACHER_ID" />
<many-to-many class="mypack.Monkey" column="MONKEY_ID" />
</set> </class>
</hibernate-mapping>
3.
package mypack; import java.util.Set;
import java.util.HashSet; public class Monkey {
private Long id;
private String name;
private Set teachers=new HashSet(); public Monkey(String name, Set teachers) {
this.name = name;
this.teachers = teachers; } /** default constructor */
public Monkey() {
} public Long getId() {
return this.id;
} public void setId(Long id) {
this.id = id;
} public String getName() {
return this.name;
} public void setName(String name) {
this.name = name;
} public Set getTeachers() {
return this.teachers;
} public void setTeachers(Set teachers) {
this.teachers = teachers;
} }
4.
package mypack;
import java.util.Set;
import java.util.HashSet; public class Teacher {
private Long id;
private String name;
private Set monkeys=new HashSet(); /** full constructor */
public Teacher(String name) {
this.name = name;
} /** default constructor */
public Teacher() {
} public String getName() {
return this.name;
} public void setName(String name) {
this.name = name;
} public Long getId() {
return this.id;
} public void setId(Long id) {
this.id = id;
} public Set getMonkeys() {
return this.monkeys;
} public void setMonkeys(Set monkeys) {
this.monkeys = monkeys;
} }
5.
package mypack; import org.hibernate.*;
import org.hibernate.cfg.Configuration;
import java.util.*; public class BusinessService{
public static SessionFactory sessionFactory;
static{
try{
Configuration config = new Configuration().configure();
sessionFactory = config.buildSessionFactory();
}catch(RuntimeException e){e.printStackTrace();throw e;}
} public void saveMonkey(Monkey monkey){
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
session.save(monkey);
tx.commit(); }catch (RuntimeException e) {
if (tx != null) {
tx.rollback();
}
throw e;
} finally {
session.close();
}
} public Monkey loadMonkey(Long id){
Session session = sessionFactory.openSession();
Transaction tx = null;
try {
tx = session.beginTransaction();
Monkey monkey=(Monkey)session.get(Monkey.class,id);
Hibernate.initialize(monkey.getTeachers());
tx.commit(); return monkey; }catch (RuntimeException e) {
if (tx != null) {
tx.rollback();
}
throw e;
} finally {
session.close();
}
} public void printMonkey(Monkey monkey){
Set teachers=monkey.getTeachers();
Iterator it=teachers.iterator();
while(it.hasNext()){
Teacher teacher=(Teacher)it.next();
System.out.println(monkey.getName()+" "+teacher.getName());
} } public void test(){ Teacher teacher1=new Teacher("¶þÀÉÉñ");
Teacher teacher2=new Teacher("ºìº¢¶ù"); Monkey monkey1=new Monkey();
monkey1.setName("ÖǶàÐÇ");
monkey1.getTeachers().add(teacher1);
monkey1.getTeachers().add(teacher2);
teacher1.getMonkeys().add(monkey1);
teacher2.getMonkeys().add(monkey1); Monkey monkey2=new Monkey();
monkey2.setName("ÀÏÍçͯ");
monkey2.getTeachers().add(teacher1);
teacher1.getMonkeys().add(monkey2); saveMonkey(monkey1);
saveMonkey(monkey2); monkey1=loadMonkey(monkey1.getId());
printMonkey(monkey1); } public static void main(String args[]){
new BusinessService().test();
sessionFactory.close();
}
}
6.
drop database if exists SAMPLEDB;
create database SAMPLEDB;
use SAMPLEDB; create table MONKEYS(
ID bigint not null,
NAME varchar(15),
primary key (ID)
); create table TEACHERS(
ID bigint not null,
NAME varchar(15),
primary key(ID)
); create table LEARNING(
MONKEY_ID bigint not null,
TEACHER_ID bigint not null,
primary key(MONKEY_ID,TEACHER_ID)
); alter table LEARNING add index IDX_MONKEY(MONKEY_ID),
add constraint FK_MONKEY foreign key (MONKEY_ID) references MONKEYS(ID); alter table LEARNING add index IDX_TEACHER(TEACHER_ID),
add constraint FK_TEACHER foreign key (TEACHER_ID) references TEACHERS(ID);
Hibernate逍遥游记-第13章 映射实体关联关系-004双向多对多(inverse="true")的更多相关文章
- Hibernate逍遥游记-第13章 映射实体关联关系-006双向多对多(分解为一对多)
1. 2. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate ...
- Hibernate逍遥游记-第13章 映射实体关联关系-005双向多对多(使用组件类集合\<composite-element>\)
1. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hi ...
- Hibernate逍遥游记-第13章 映射实体关联关系-003单向多对多
0. 1. drop database if exists SAMPLEDB; create database SAMPLEDB; use SAMPLEDB; create table MONKEYS ...
- Hibernate逍遥游记-第13章 映射实体关联关系-002用主键映射一对一(<one-to-one constrained="true">、<generator class="foreign">)
1. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hi ...
- Hibernate逍遥游记-第13章 映射实体关联关系-001用外键映射一对一(<many-to-one unique="true">、<one-to-one>)
1. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hi ...
- Hibernate逍遥游记-第5章映射一对多-02双向(<set>、<key>、<one-to-many>、inverse、cascade="all-delete-orphan")
1. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hi ...
- Hibernate逍遥游记-第10章 映射继承关系-003继承关系树中的每个类对应一个表(joined-subclass)
1. 2. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate ...
- Hibernate逍遥游记-第10章 映射继承关系-002继承关系树中的根类对应一个表(discriminator、subclass)
1. 2. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate ...
- Hibernate逍遥游记-第12章 映射值类型集合-005对集合排序Map(<order-by>\<sort>)
1. <?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hi ...
随机推荐
- 动态创建MySQL数据库
import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sq ...
- 表达式语言之ongl表达式
OGNL的全称是Object Graph Navigation Language(对象图导航语言),它是一种强大的表达式语言,让你通过简单一致的表达式语法来读取和设置Java对象的属性值,调用对象的方 ...
- sysfs分析
Linux设备模型——设备驱动模型和sysfs文件系统解读 内核版本:2.6.30 1. What is sysfs? 个人理解:sysfs向用户空间展示了驱动设备的层次结构.我们都知道设备和对应 ...
- pthread属性设置
Posix线程中的线程属性pthread_attr_t主要包括scope属性.detach属性.堆栈地址.堆栈大小.优先级.在pthread_create中,把第二个参数设置为NULL的话,将采用默认 ...
- mysql卸载
先执行mysql安装程序,点击移除,然后再删除对应的安装路径,必要的时候还要删除注册表信息.
- 高级php面试题及部分答案
在网上看到一些高级php 的面试题目.. 闲来无事,搞了一些答案...可能不是很全面,留这以后备用吧. 一. 基本知识点1.1 HTTP协议中几个状态码的含义:503 500 401 403 404 ...
- 如何解决Mac与iPhone之间handoff连接问题
首先账户以及设备handoff开关问题不再赘述.主要是昨天发现的一个小技巧 当确认所有设备的iCloud账号统一.蓝牙打开.处在同一WiFi下的前提下,我的iPhone和Mac仍然handoff连接有 ...
- 如何使用Xcode6 调试UI,Reveal
实际测试需要使用IOS8并且32-bit的设备:具体打开调试的方法有三种: 1.底部调试菜单中: 2,debug菜单中 3.debug navigator 中
- Hbase的安装测试工作
Hbase的安装测试工作: 安装:http://www.cnblogs.com/neverwinter/archive/2013/03/28/2985798.html 测试:http://www.cn ...
- 【HDOJ】【4089】Activation
概率DP kuangbin总结中的第5题 题解copy: HDU 4098 题意:有n个人排队等着在官网上激活游戏.Tomato排在第m个. 对于队列中的第一个人.有一下情况: 1.激活失败,留在队列 ...