Spring DAO之Hibernate

Spring DAO之Hibernate

 

HibernateDaoSupport - Hibernate数据访问对象的基类。 需要一个SessionFactory，同时为子类提供 HibernateTemplate。也可以选择直接通过 提供一个HibernateTemplate来初始化， 这样就可以重用后者的设置，例如SessionFactory， flush模式，异常翻译器（exception translator）等等。

本节主要讨论Sping对HibernateTemplate的支持。

下面是个例子：

 

drop table if exists user;

/*==============================================================*/
/* Table: user                                                  */
/*==============================================================*/
create table user
(
   id                   bigint AUTO_INCREMENT not null,
   name                 varchar(24),
   age                   int,
   primary key (id)
);

 

/**
* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2008-4-23 15:37:34

* Note: Hiberante实体类
*/
public class User {
     private Integer id;
     private String name;
     private Integer age;

     public Integer getId() {
         return id;
    }

     public void setId(Integer id) {
         this.id = id;
    }

     public String getName() {
         return name;
    }

     public void setName(String name) {
         this.name = name;
    }

     public Integer getAge() {
         return age;
    }

     public void setAge(Integer age) {
         this.age = age;
    }
}

 

xml version ="1.0" encoding ="utf-8" ?>
    PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

< hibernate-mapping >

     < class name ="com.lavasoft.springnote.ch06_hbm_02deTx.User"
           table ="user" >

         < id name ="id" column ="id" >
             < generator class ="native" />
         id >

         < property name ="name" column ="name" />

         < property name ="age" column ="age" />

     class >

hibernate-mapping >

 

/**
* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2008-4-23 15:37:43

* Note: DAO接口
*/
public interface IUserDAO {
     public void insert(User user);
     public User find(Integer id);
}

 

import org.hibernate.SessionFactory;
import org.springframework.orm.hibernate3.HibernateTemplate;

/**
* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2008-4-23 15:15:55

* Note: DAO实现
*/
public class UserDAO implements IUserDAO {
     private HibernateTemplate hibernateTemplate;

     public void setSessionFactory(SessionFactory sessionFactory) {
         this.hibernateTemplate = new HibernateTemplate(sessionFactory);
    }

     public void insert(User user) {
        hibernateTemplate.save(user);
        System.out.println( "所保存的User对象的ID:"+user.getId());
    }

     public User find(Integer id) {
        User user =(User) hibernateTemplate.get(User. class, id);
         return user;
    }
}

 

xml version ="1.0" encoding ="UTF-8" ?>
"http://www.springframework.org/dtd/spring-beans.dtd">
< beans >
     < bean id ="dataSource"
           class ="org.springframework.jdbc.datasource.DriverManagerDataSource" >
         < property name ="driverClassName" >
             < value >com.mysql.jdbc.Driver value >
         property >
         < property name ="url" >
             < value >jdbc:mysql://localhost:3306/springdb value >
         property >
         < property name ="username" >
             < value >root value >
         property >
         < property name ="password" >
             < value >leizhimin value >
         property >
     bean >

     < bean id ="sessionFactory"
           class ="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
           destroy-method ="close" >
         < property name ="dataSource" >
             < ref bean ="dataSource" />
         property >
         < property name ="mappingResources" >
             < list >
                 < value >com/lavasoft/springnote/ch06_hbm_02proTx/User.hbm.xml value >
             list >
         property >
         < property name ="hibernateProperties" >
             < props >
                 < prop key ="hibernate.dialect" >
                    org.hibernate.dialect.MySQLDialect
                 prop >
             props >
         property >
     bean >


     < bean id ="userDAO" class ="com.lavasoft.springnote.ch06_hbm_02proTx.UserDAO" >
         < property name ="sessionFactory" >
             < ref bean ="sessionFactory" />
         property >
     bean >
beans >

 

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.FileSystemXmlApplicationContext;

/**
* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2008-4-23 15:16:34

* Note: 测试类、客户端
*/
public class SpringHibernateDemo {
     public static void main(String[] args) {
        ApplicationContext context = new FileSystemXmlApplicationContext( "D:\\_spring\\src\\com\\lavasoft\\springnote\\ch06_hbm_02proTx\\bean-hbm_tx.xml");

         // 建立DAO物件
        IUserDAO userDAO = (IUserDAO) context.getBean( "userDAO");

        User user = new User();
        user.setName( "caterpillar");
        user.setAge( new Integer(30));

        userDAO.insert(user);

        user = userDAO.find( new Integer(1));

        System.out.println( "name: " + user.getName());
    }
}

 

运行结果：

log4j:WARN No appenders could be found for logger (org.springframework.core.CollectionFactory).
log4j:WARN Please initialize the log4j system properly.
所保存的User对象的ID:18
name: jdbctemplate

Process finished with exit code 0

 

 

以上对数据的操作都没有添加事务，后面会专门介绍。