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);
}
}