第9章 Hibernate框架高级应用1.pptx

第九章 Hibernate高级应用;9.1 Hibernate的关联映射 ;9.1 Hibernate的关联映射;9.1 Hibernate的关联映射;9.1.1 单向N-1关联;9.1.1 单向N-1关联;9.1.1 单向N-1关联;一、无连接表的N-1关联 Person.hbm.xml文件 ?xml version=1.0 encoding=GBK? !-- 指定Hibernate的DTD信息 -- !DOCTYPE hibernate-mapping PUBLIC -//Hibernate/Hibernate Mapping DTD 3.0//EN /dtd/hibernate-mapping-3.0.dtd hibernate-mapping package=org.crazyit.app.domain !-- 映射Person持久化类-- class name=Person table=person_inf !-- 映射标识属性 -- id name=id column=person_id !-- 定义主键生成器策略 -- generator class=identity/ /id !-- 用于映射普通属性 -- property name=name type=string/ property name=age type=int/ !-- 用于映射N-1关联实体，指定关联实体类为Address 指定外键列名为address_id,并指定级联全部操作 -- many-to-one name=address cascade=“all class=Address column=address_id/ /class /hibernate-mapping;Address.hbm.xml文件 ?xml version=1.0 encoding=GBK? !-- 指定Hibernate的DTD信息 -- !DOCTYPE hibernate-mapping PUBLIC -//Hibernate/Hibernate Mapping DTD 3.0//EN /dtd/hibernate-mapping-3.0.dtd hibernate-mapping package=org.crazyit.app.domain !-- Address持久化类-- class name=Address table=address_inf !-- 映射标识属性addressid -- id name=addressId column=address_id !-- 指定主键生成器策略 -- generator class=identity/ /id !-- 映射普通属性addressDetail -- property name=addressDetail/ /class /hibernate-mapping;持久化代码 private void testPerson() { Session session = HibernateUtil.currentSession(); Transaction tx = session.beginTransaction(); //创建一个Person对象 Person p = new Person(); //创建一个瞬态的Address对象 Address a = new Address(“Guangzhou); //① //设置Person的Name为Yeeku字符串 p.setName(Yeeku); p.setAge(29); //设置Person和Address之间的关联关系 p.setAddress(a); //持久化Person对象 session.persist(p); //创建一个瞬态的Address对象 Address a2 = new Address(“Shanghai); //② //修改持久化状态的Person对象 p.setAddress(a2); //③ mit(); HibernateUtil.closeSession(); };Hibernate: insert into address_inf (addressDetail) values (?) Hibernate: insert into person_inf (