Spring : 征服数据库 (二）

这部分介绍Spring和ORM框架的整合。虽然Hibernate在开源ORM 社区很流行，但本文会以MyBatis为例讲解。另外关于MyBatis和Hibernate的优劣之分是没有意义的，主要是看实际需求，有兴趣可以百度、谷歌查看。

首先配置环境，你得有mybatis和mybatis-spring在Spring工程的build path里,如果你使用的是Maven,只需添加下面的依赖：（都是目前最新版本）

		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.2.7</version>
		</dependency>
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.2.2</version>
		</dependency>

我们知道，MyBatis应用的核心是SqlSessionFactory，在Spring里也需要定义这样一个bean，

 <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
  </bean>

<jdbc:embedded-database id="dataSource" type="H2">
		<jdbc:script location="classpath:schema.sql" />
		<jdbc:script location="classpath:data.sql" />
	</jdbc:embedded-database>

create table spitter (
  id identity,
  username varchar(25) not null,
  password varchar(25) not null,
  fullname varchar(100) not null,
  email varchar(50) not null,
  update_by_email boolean not null
);

package org.chen.mybatis.mapper;

import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;
import org.chen.domain.Spitter;
public interface SpitterMapper {

	@Select("SELECT * from spitter where email = #{email}")
	Spitter getSpitter(@Param("email") String email);
}

然后使用MapperFactoryBean将该接口注册到Spring，

  <bean id="spitterMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
      <property name="mapperInterface" value="org.chen.mybatis.mapper.SpitterMapper" />
      <property name="sqlSessionFactory" ref="sqlSessionFactory" />
  </bean>

如，

public class TestService {

	private SpitterMapper spitterMapper;

	public void setSpitterMapper(SpitterMapper spitterMapper) {
		this.spitterMapper = spitterMapper;
	}


	public void getSpitterByEmail(String email){
		
		Spitter spitter = spitterMapper.getSpitter(email);
		
		System.out.println("spitter is " + spitter.getFullName());
	}
}