hibernate中可以一次对多个表进行数据插入，这种插入类似
Hibernate的关联映射关系有：
多对一 ---- many-to-one
一对多 ---- one-to-many
一对一 ---- one-to-one
多对多 ---- many-to-many
比较常用的是多对一和一对一关联映射多对一关联映射：
关联关系表 必须要填吗，场景：用户和组；从用户角度来看，多个用户属于一个组（多对一关联）
使用Hibernate开发的思路：先建立对象模型，把实体抽取出来。目前两个实体：用户和组两个实体，多个学生拥有同一个地址
，所有用户实体中应该有一个持有组的引用
看实体类：
package com.entity;/*** Student entity. @author MyEclipse Persistence Tools*/public class Student implements java.io.Serializable {// Fieldsprivate Integer id;private String name;private Integer addid;private Adrress adss;// Constructorspublic Adrress getAdss() {return adss;}public void setAdss(Adrress adss) {this.adss = adss;}/** default constructor */public Student() {}/** full constructor */public Student(String name, Integer addid) {this.name = name;this.addid = addid;}// Property accessorspublic Integer getId() {return this.id;}public void setId(Integer id) {this.id = id;}public String getName() {return this.name;}public void setName(String name) {this.name = name;}public Integer getAddid() {return this.addid;}public void setAddid(Integer addid) {this.addid = addid;}}
package com.entity;/*** Adrress entity. @author MyEclipse Persistence Tools*/public class Adrress implements java.io.Serializable {// Fieldsprivate Integer idAdrress;private String detail;// Constructors/** default constructor */public Adrress() {}/** full constructor */public Adrress(String detail) {this.detail = detail;}// Property accessorspublic Integer getIdAdrress() {return this.idAdrress;}public void setIdAdrress(Integer idAdrress) {this.idAdrress = idAdrress;}public String getDetail() {return this.detail;}public void setDetail(String detail) {this.detail = detail;}}
关联表更新、hibernate 映射表的内容
<?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">
<!-- Mapping file autogenerated by MyEclipse Persistence Tools -->
<hibernate-mapping><class name="com.entity.Student" table="student" catalog="test"><id name="id" type="java.lang.Integer"><column name="id" /><generator class="increment"></generator></id><property name="name" type="java.lang.String"><column name="Name" length="45" /></property><many-to-one name="adss" column="addid" cascade="save-update" class="com.entity.Adrress"></many-to-one><!-- name 属性表示Student类中的属性，column为对应的表中的和adrress表中主键关联的名称，也就是将address类中的主键的值作为addid的值插入表student中 --></class>
</hibernate-mapping>
Spring中配置了事务，利用的是注解的方式
<bean id="sessionFactoryt"class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"><!-- 也可以这样配 --><!-- <property name="configLocation"> <value>classpath:hibernate.cfg.xml</value> </property> --><property name="dataSource"><ref bean="dataSource" /></property><property name="hibernateProperties"><props><prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect <!-- 数据库所用的sql语句 --></prop><prop key="hibernate.show_sql">true</prop><prop key="hibernate.format_sql">true</prop><prop key="hibernate.cache.use_second_level_cache">true</prop> <!--启用二级缓存 --><prop key="hibernate.cache.use_query_cache">false</prop> <!--是否启动查询缓存 --><prop key="hibernate.cache.provider_class">org.hibernate.cache.EhCacheProvider</prop> <!--指定缓存类 --></props></property><!-- <property name="packagesToScan" value="com.*" /> 为什么不起作用，别人的就可以 --><!-- <property name="mappingResources"> <list> <value>com/entity/Admin.hbm.xml</value> <value>com/entity/Userinfo.hbm.xml</value> </list> </property> --><property name="mappingDirectoryLocations"><list><value>com/entity</value></list></property></bean> <bean id="tm"class="org.springframework.orm.hibernate4.HibernateTransactionManager"><property name="sessionFactory" ref="sessionFactoryt" /></bean>
<bean id="userDao" class="com.dao.imp.UserDao"><property name="sessionFactory" ref="sessionFactoryt" /></bean><tx:advice id="txAdvice" transaction-manager="tm"><tx:attributes><!-- 配置被weave织入的那些方法, 使用的传播行为和隔离级别 --><tx:method name="*" propagation="REQUIRED" isolation="READ_COMMITTED" /></tx:attributes></tx:advice><!-- 6.aop:config--><aop:config><aop:advisor advice-ref="txAdvice"pointcut="execution(* com.dao.imp.UserDao.*(..))" /></aop:config> <tx:annotation-driven transaction-manager="tm" />
两表关联查询？测试代码
ApplicationContext ctx = new ClassPathXmlApplicationContext("applicationContext.xml");UserDao ud1=(UserDao)ctx.getBean("userDao");//改成userDao就是注解方式的代理
System.out.println("OK");
ud1.insert("liu");
UserDao中的插入数据，因为没有用到接口Spring采用的CGLib代理。
sql关联表。
public void insert(String s) {System.out.println("插入数据！");// sessionFactory.openSession().save(arg0)
Admin adm = new Admin();Session sess = sessionFactory.getCurrentSession();Adrress ad = new Adrress();ad.setDetail("shan xi");Student st = new Student();st.setName("liuyu");st.setAdss(ad);sess.save(st);//Transaction tx = sess.beginTransaction();//tx.begin();/*Userinfo user = new Userinfo();System.out.println("查找数据！");// TODO Auto-generated method stub}
如果成功，就可以看到如下的语句：
插入数据！
Hibernate: selectmax(id) fromstudent
Hibernate: selectmax(idAdrress) fromadrress
插入数据！
Hibernate: insert intotest.adrress(detail, idAdrress) values(?, ?)
Hibernate: insert intotest.student(Name, addid, id) values(?, ?, ?) 表关联？
回到数据库中也可以看到结果。
参考：http://blog.csdn.net/fengxuezhiye/article/details/7369786
