hibernate组建映射

当一个用户表中字段比较多，而有些字段是不常用，则可以用组件映射

基本信息：

private Long id;
	private String username;
	private String password;
	private UserMessage message ;

组件信息 ，UserMessage

private String address;
	private String email;
	private String phone;
	private String postcode;
	private Userinfo info ;

private Userinfo info 这里是为了配置双向关联

<hibernate-mapping>
    <class name="com.pojo.Userinfo" table="USERINFO" schema="ZM">
        <id name="id" type="java.lang.Long">
            <column name="ID" precision="10" scale="0" />
            <generator class="increment" />
        </id>
        <property name="username" type="java.lang.String">
            <column name="USERNAME" length="100" />
        </property>
        <property name="password" type="java.lang.String">
            <column name="PASSWORD" length="100" />
        </property>
       
       <component name="message" class="com.pojo.UserMessage">
       <parent name="info" />
        <property name="address" type="java.lang.String">
            <column name="ADDRESS" length="100" />
        </property>
        <property name="email" type="java.lang.String">
            <column name="EMAIL" length="100" />
        </property>
        <property name="phone" type="java.lang.String">
            <column name="PHONE" length="100" />
        </property>
        <property name="postcode" type="java.lang.String">
            <column name="POSTCODE" length="100" />
        </property>
       
       </component>
       
    </class>
</hibernate-mapping>

组件映射用到了 <component name="message" class="com.pojo.UserMessage">

配置双向关联 ： <parent name="info" />

测试类：

public static void main(String[] args) {
		Userinfo info = new Userinfo() ;
		info.setId(new Long(1)) ;
		info.setUsername("zhangsan") ;
		info.setPassword("111111") ;
		
		UserMessage message = new UserMessage() ;
		message.setAddress("西里小区") ;
		message.setEmail("[e-mail]") ;
		message.setPhone("123456") ;
		message.setPostcode("100082") ;
		
		info.setMessage(message) ;
		message.setInfo(info) ;
		HibernateTestcompent.add(info) ;
		HibernateTestcompent.load(message) ;
		
	}
	public static void add(Userinfo userinfo) {
		session = HibernateManager.openSession();
		try {
			session.save(userinfo);
			HibernateManager.closeSession();
		} catch (Exception e) {
			HibernateManager.rollbackTransaction();
		}
	}
	@SuppressWarnings("unchecked")
	public static void load() {
		session = HibernateManager.openSession();
		try {
			Userinfo user = (Userinfo) session.get(Userinfo.class, new Long(1));
			System.out.println(user.getId());
			System.out.println(user.getUsername());
			System.out.println(user.getPassword());
			System.out.println(user.getMessage().getAddress());
			System.out.println(user.getMessage().getEmail());
			System.out.println(user.getMessage().getPhone());
			System.out.println(user.getMessage().getPostcode());
			
			HibernateManager.closeSession();
		} catch (Exception e) {
			e.printStackTrace();
			HibernateManager.rollbackTransaction();
		}
	}
	
	public static void load(UserMessage message) {
			Userinfo info = message.getInfo();
			System.out.println(info.getId());
			System.out.println(info.getUsername());
			System.out.println(info.getPassword());
			System.out.println(message.getAddress());
			System.out.println(message.getEmail());
			System.out.println(message.getPhone());
			System.out.println(message.getPostcode());
			
	}

测试结果：

Hibernate:
select
max(ID)
from
USERINFO
Hibernate:
insert
into
ZM.USERINFO
(USERNAME, PASSWORD, ADDRESS, EMAIL, PHONE, POSTCODE, ID)
values
(?, ?, ?, ?, ?, ?, ?)
3
zhangsan
111111
西里小区
[e-mail]
123456
100082