Mybatis之整合Spring

环境

1、JDK1.8
2、mybatis-3.2.7
3、spring-framework-4.3.2.RELEASE
4、eclipse: Oxygen.3a Release (4.7.3a)

项目结构

所需jar包

配置文件

MybatisConfig.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>
    <!-- 自定义别名 -->
    <typeAliases>
        <package name="com.zyj.ms.po" />
    </typeAliases>

    <!-- 加载映射文件 -->
    <mappers>
        <mapper resource="mybatis/sqlmap/User.xml" />
    </mappers>
</configuration>

applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<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 ">

    <!-- 加载java的配置文件 -->
    <context:property-placeholder location="db.properties" />

    <!-- 创建数据源，这里使用JDBC数据源 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="${db.driver}" />
        <property name="url" value="${db.url}" />
        <property name="username" value="${db.username}" />
        <property name="password" value="${db.password}" />
        <property name="maxActive" value="10" />
        <property name="maxIdle" value="5" />
    </bean>

    <!-- SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 指定mybatis的全局配置文件的路径 -->
        <property name="configLocation" value="mybatis/MybatisConfig.xml"></property>
        <!-- 数据源 -->
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 使用dao开发 -->
    <bean id="userDao" class="com.zyj.ms.dao.UserDaoImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>

    <!-- 使用mapper开发 -->
    <!-- 方式一：单独配置UserMapper代理类 -->
    <bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
        <!-- 设置代理类的接口 -->
        <property name="mapperInterface" value="com.zyj.ms.mapper.UserMapper"></property>
        <!-- 依赖注入SqlSessionFactory -->
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean> 

    <!-- 方式二：批量配置mapper代理类，默认bean的id为类名首字母小写 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 配置扫描的包 -->
        <property name="basePackage" value="com.zyj.ms.mapper"></property>
        <!-- 默认不需要配置SqlSessionFactory（只有一个SqlSessionFactory时），单独配置也可以 -->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
    </bean>
</beans>

DAO开发

User.xml

<?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">
    <!-- 根据用户ID查询用户信息 -->
    <select id="findUserById" parameterType="int" resultType="user">
        SELECT
        * FROM USER WHERE id =#{id}
    </select>
</mapper>

UserDao.java

public interface UserDao {
    public User findUserById(int id);
}

UserDaoImpl.java

public class UserDaoImpl extends SqlSessionDaoSupport implements UserDao {
    @Override
    public User findUserById(int id) {
        return this.getSqlSession().selectOne("test.findUserById", id);
    }
}

UserDaoTest.java

public class UserDaoTest {
    private ApplicationContext applicationContext;

    @Before
    public void setUp() {
        applicationContext = new ClassPathXmlApplicationContext("spring/applicationContext.xml");
    }

    @Test
    public void testFindUserById() {
        UserDao userDao = (UserDao) applicationContext.getBean("userDao");
        User user = userDao.findUserById(1);
        System.out.println(user);
    }
}

Mapper开发

UserMapper.java

public interface UserMapper {
    public User findUserById(int id);
}

UserMapper.xml

<?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.zyj.ms.mapper.UserMapper">
    <select id="findUserById" parameterType="int" resultType="com.zyj.ms.po.User">
        select * from user where id = #{id}
    </select>
</mapper>

UserMapperTest.java

public class UserMapperTest {
    private ApplicationContext applicationContext;

    @Before
    public void setUp() {
        applicationContext = new ClassPathXmlApplicationContext("spring/applicationContext.xml");
    }

    @Test
    public void testFindUserById() {
        UserMapper userMapper = (UserMapper) applicationContext.getBean("userMapper");
        User user = userMapper.findUserById(1);
        System.out.println(user);
    }
}