spring整合mybatis框架

1.导入jar包

2.配置文件

a.    applicationContext.xml文件

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/mvc
		http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/aop
		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://www.springframework.org/schema/tx
		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd ">

<!-- 配置数据源dataSource -->
<!-- 加载配置文件 -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 数据库连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
       <property name="driverClassName" value="${jdbc.driver}"/>
		<property name="url" value="${jdbc.url}"/>
		<property name="username" value="${jdbc.username}"/>
		<property name="password" value="${jdbc.password}"/>
		<property name="maxActive" value="10"/>
		<property name="maxIdle" value="5"/>
</bean>	

<!-- 配置sqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
	<!-- 配置数据源 -->
	<property name="dataSource" ref="dataSource"/>
	<!-- 加载mybatis的配置文件 -->
	<property name="configLocation" value="classpath:SqlMapConfig.xml"/>
</bean>

<!-- 原始dao -->
<bean id="userDao" class="com.baidu.dao.imp.UserDaoImp">
	<property name="sqlSessionFactory"  ref="sqlSessionFactory"/>
</bean>
 <!-- mapper代理配置 -->
<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
 		<!-- 指定mapper接口 -->
 		<property name="mapperInterface" value="com.baidu.dao.UserDao"/>
 		<!-- 注入SqlSessionFactory -->
 		<property name="sqlSessionFactory"  ref="sqlSessionFactory"/>
 </bean>
</beans>

 <!-- 使用mapper扫描器创建mapper代理对象
 扫描器把自动将包下边的mapper扫描出来创建代理对象在spring容器注册，bean的id为类名（首字母小写）
  -->
 <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
 	<!-- 指定要扫描的包路径，如果要扫描多个包，中间使用半角逗号分隔
 	注意：如果使用扫描器，不需要在sqlMapConfig.xml中加载mapper，要将mapper.xml和mapper.java放在同一个目录且同名
 	 -->
 	<property name="basePackage" value="com.baidu.dao"/>
 	<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
 </bean>

　　

b.    SqlMapperConfig.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<typeAliases>
		<typeAlias type="com.baidu.pojo.User" alias="u" />
	</typeAliases>
	<!-- 加载mapper.xml -->
	<mappers>
		<mapper resource="UserMapper.xml" />
	</mappers>
</configuration>

c.　XxxMaper.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.baidu.dao.UserDao">
	<!-- 查询用户通过id -->
	<select id="findById" parameterType="u" resultMap="u">
		SELECT id,username,sex,birthday,address
		FROM USER
		<where>
		<if test="id!=null and id!=''">
			and id = #{id}
		</if>
		<if test="username!=null and username!=''">
			and username like '%${username}%'
		</if>
		</where>
	</select>
</mapper>

d.   db.propertis

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/mybatis
jdbc.username=root
jdbc.password=123

3.相关类

a.UserDao.java

package com.baidu.dao;

import com.baidu.pojo.User;

public interface UserDao {
	public User findById(User u);
}

b.UserDaoImp.java

package com.baidu.dao.imp;

import java.util.List;

import org.apache.ibatis.session.SqlSession;
import org.mybatis.spring.support.SqlSessionDaoSupport;

import com.baidu.dao.UserDao;
import com.baidu.pojo.User;

public class UserDaoImp extends SqlSessionDaoSupport implements UserDao{

	@Override
	public User findById(User u) {
		//获取session
		// Sqlsession定义为局部变量
		SqlSession sqlSession = this.getSqlSession();
		User user = sqlSession.selectOne("com.baidu.dao.UserDao.findById", u);
    	return user;
	}
}

　　继承sqlSessionDaoSupport的原因是

c.User.java

public class User implements Serializable {
	private int id;
	private String username;// 用户姓名
	private String sex;// 性别
	private Date birthday;// 生日
	private String address;// 地址
}

d.MyBatisTest.java

public class MyBatisTest {
		private ApplicationContext applicationContext;
		@Before
		public void setup(){
			//加载spring配置文件
			//取出spring的容器
			applicationContext =
					new ClassPathXmlApplicationContext("classpath:applicationContext.xml");
		}
		@Test
		public void testFindUserById() throws Exception {

			//从容器中取出dao
			UserDao userDao = (UserDao) applicationContext.getBean("userDao");
			//调用dao的方法
			User u=new User();
			u.setUsername("fan");
			User user = userDao.findById(u);
			System.out.println(user);

		}

}