实现mybatis与spring进行整合,通过spring管理SqlSessionFactory、mapper接口。
mybatis与spring整合jar
mybatis官方提供与mybatis与spring整合jar包:

还包括其它jar:
spring3.2.0
mybatis3.2.7
dbcp连接池
数据库驱动
参考:
mybatis与spring整合全部jar包
Mybatis配置文件
在classpath下创建mybatis/SqlMapConfig.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>
<mappers>
<mapper resource="sqlmap/User.xml" />
<mapper resource="mapper/UserMapper.xml" />
</mappers>
</configuration>
Spring配置文件
在classpath下创建applicationContext.xml,定义数据库链接池、SqlSessionFactory。
<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 ">
<context:property-placeholder location="classpath:db.properties" />
<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>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml" />
</bean>
</beans>
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注意:在定义sqlSessionFactory时指定数据源dataSource和mybatis的配置文件。
1.原始dao开发(和spring整合后)
1.User.xml映射文件:
<?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="test">
<select id="findUserById" parameterType="int" resultType="com.huihui.pojo.User">
select * from user where id=#{id}
</select>
</mapper>
在SqlMapconfig.xml中加载User.xml:
<mappers>
<mapper resource="sqlmap/User.xml" />
</mappers>
2.UserDao接口:
public interface UserDao {
public User findUserById(int id) throws Exception;
}
3.UserDao接口的实现类:(需要继承SqlSessionDaoSupport)
public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao{
@Override
public User findUserById(int id) throws Exception {
SqlSession sqlSession = this.getSqlSession();
User user = sqlSession.selectOne("test.findUserById", id);
return user;
}
}
4.在applicationContext.xml配置文件中增加如下内容:
<bean id="userDao" class="com.huihui.dao.UserDaoImpl">
<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean>
5.测试:
public class UserDaoImplTest {
private ApplicationContext applicationContext;
@Before
public void setUp() throws Exception {
applicationContext = new ClassPathXmlApplicationContext("classpath:spring/applicationContext.xml");
}
@Test
public void testFindUserById() throws Exception{
UserDao userdao = (UserDao)applicationContext.getBean("userDao");
User user = userdao.findUserById(1);
System.out.println(user);
}
}
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2.mapper代理的开放(与Spring整合后)
1.UserMapper.xml映射文件:
<?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.huihui.mapper.UserMapper">
<select id="findUserById" parameterType="int" resultType="com.huihui.pojo.User">
select * from user where id=#{id}
</select>
</mapper>
在SqlMapconfig.xml中加载UserMapper.xml:
<mappers>
<mapper resource="sqlmap/User.xml" />
<mapper resource="mapper/UserMapper.xml"/>
</mappers>
2.mapper接口:
public interface UserMapper {
public User findUserById(int id) throws Exception;
}
3.在applicationContext.xml中通过MapperFactoryBean创建实体对象:
<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="com.huihui.mapper.UserMapper"/>
<property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
</bean>
4.测试:
@Test
public void testFindUserByIdMapper() throws Exception{
UserMapper userMapper = (UserMapper)applicationContext.getBean("userMapper");
User user = userMapper.findUserById(1);
System.out.println(user);
}
上面的方法存在的问题:
需要针对每个mapper进行配置,麻烦。
解决方案:
通过MapperScannerConfigurer进行mapper扫描。
此方法即mapper接口开发方法,只需定义mapper接口,不用编写mapper接口实现类。只需要在spring配置文件中定义一个mapper扫描器,自动扫描包中的mapper接口生成代代理对象。
1、 mapper.xml文件编写
2、 定义mapper接口
注意mapper.xml的文件名和mapper的接口名称保持一致,且放在同一个目录
3、 配置mapper扫描器
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="mapper接口包地址"></property>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
basePackage:扫描包路径,中间可以用逗号或分号分隔定义多个包
4、 使用扫描器后从spring容器中获取mapper的实现对象
如果将mapper.xml和mapper接口的名称保持一致且放在一个目录 则不用在sqlMapConfig.xml中进行配置