构建Mybatis项目(4)

构建Mybatis项目(四)
使用spring完成传统的dao层加biz(service层)
新建org.test.spring.service和org.test.spring.service.impl包
新建接口PeopleService,代码如下:

package org.test.spring.service;

import org.test.mybatis.model.People;

public interface PeopleService {
	People selectOneById(int id);
}

新建接口实现

package org.test.spring.service.impl;

import org.mybatis.spring.support.SqlSessionDaoSupport;
import org.test.mybatis.model.People;
import org.test.spring.service.PeopleService;

public class PeopleServiceImpl extends SqlSessionDaoSupport implements PeopleService {

	@Override
	public People selectOneById(int id) {
		return (People) getSqlSession().selectOne("selectById",id);
	}

}

在PeopleMapper.xml文件中添加

<select id="selectById" parameterType="int" resultType="org.test.mybatis.model.People">
select * from people where id=#{id}
</select>

Spring.configuration.xml文件中注册组件
<bean id="peopleService" class="org.test.spring.service.impl.PeopleServiceImpl">
		<property name="sqlSessionFactory" ref="sqlSessionFactory" /> 
	</bean> 

在Main类中添加代码:

	PeopleService pse=(PeopleService)ac.getBean("peopleService");
		People people=	pse.selectOneById(5);
		System.out.println(people.getRealName());

如此,变相使用了sqlSession来完成了service层,当然以上所述直接跳过了dao层.
至于sql语句配置在外面还是注解在接口上，根据情况自行使用