Hibernate下单表操作-组建属性

最新推荐文章于 2025-07-28 23:27:29 发布

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两个类
Address：http://paste.ubuntu.com/24841251/
User：http://paste.ubuntu.com/24841252/
hibernate配置文件

注意SQL驱动不要选择太高的版本，不匹配的话，后面的会出错。

<hibernate-configuration>
    <session-factory>
        <property name="connection.username">root</property>
        <property name="connection.password">102559</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">
            jdbc:mysql://localhost:3396/hibernate_test?useUnicode=true&amp;characterEncoding=utf8
        </property>

        <property name="dialect">
            org.hibernate.dialect.MySQL5InnoDBDialect
        </property>
        <property name="show_sql">true</property>
        <property name="format_sql">true</property>
        <property name="hbm2ddl.auto">update</property>
        <property name="hibernate.current_session_context_class">thread</property>

        <mapping resource="entity/User.hbm.xml" />
    </session-factory>
</hibernate-configuration>

映射文件

<hibernate-mapping>
    <class name="entity.User" table="USER">
        <id name="uid" type="int" column="UID" >
            <generator class="increment"/>
        </id>
        <property name="uname" type="string" column="UNAME" length="30"/>
        <property name="uage" type="int" column="UAGE" />
        <property name="usex" type="boolean" column="USEX" />
        <property name="ubirthday" type="date" column="UBIRTHDAY" />
        <component name="uaddress" class="entity.Address">
            <property name="street" type="string" column="USTREET" length="30"/>
            <property name="code" type="int" column="UCODE" />
            <property name="email" type="string" column="UEMAIL" length="30"/>
        </component>
    </class>
</hibernate-mapping>

初学的话，还是建议手写，不要用集成工具自动生成。这样，你会遇到一些错误，然后你就知道那些你需要注意，那些容易错。

测试

package test;

import java.util.Calendar;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.boot.MetadataSources;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.service.ServiceRegistry;
import org.junit.Test;

import entity.Address;
import entity.User;

public class JunitTest {

    @Test
    public void testComponent() {
        // 创建服务注册对象
        ServiceRegistry registry = 
                new StandardServiceRegistryBuilder().configure().build();
        // 创建会话共产
        SessionFactory sessionFactory =
                new MetadataSources(registry).buildMetadata().buildSessionFactory();
        // 创建会话
        Session session = sessionFactory.getCurrentSession();
        // 创建事务
        Transaction transaction = session.beginTransaction();
        // 创建两个临时对象
        Address address = new Address("南京东路", 235549, "nanchang@university.edu");
        User user = new User(0, "王浩", 23, true, 
                Calendar.getInstance().getTime(),address);
        // 保存对象
        session.save(user);
        // 提交事务
        transaction.commit();
        // 关闭会话和会话工厂
        session.close();
        sessionFactory.close();
        // 注销服务注册对象
        StandardServiceRegistryBuilder.destroy(registry);
    }
}

结果