整体步骤:
- 编写数据源配置
- sqlSessionFactory
- sqlSessionTemplate
- 需要给接口添加实现类【UserMapperImpl.java】
- 测试
环境准备:
实体类:User.java
@Data
public class User {
private int id;
private String name;
private String pwd;
}
接口:UserMapper.java
public interface UserMapper {
public List<User> selectUser();
}
接口配置文件:UserMapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kuang.mapper.UserMapper">
<select id="selectUser" resultType="user">
select * from mybatis.user;
</select>
</mapper>
mybatis配置文件:mybatis-config.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>
<package name="com.kuang.pojo"/>
</typeAliases>
</configuration>
以上~~~~~~
编写Spring bean配置文件:
<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!--DataSource:使用Spring的数据源替换Mybatis的配置 c3p0 dbcp druid
我们这里使用Spring提供的jdbc :org.springframework.jdbc.datasource-->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/mybatis?useSSL=true&useUnicode=true&characterEncoding=utf8"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</bean>
<!--sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis-config.xml"/>
<property name="mapperLocations" value="com/kuang/mapper/*.xml"/>
</bean>
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<!--这里由于SqlSessionTemplate没有set方法,所以需要编写一个实现类,利用set方法将其赋值-->
<constructor-arg index="0" ref="sqlSessionFactory"/>
</bean>
</beans>
编写applicationContext.xml将上面的spring-dao.xml导入
<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<import resource="spring-dao.xml"/>
<bean id="userMapperImpl" class="com.kuang.mapper.UserMapperImpl">
<property name="sqlSessionTemplate" ref="sqlSession"/>
</bean>
</beans>
由于SqlSessionTemplate没有set方法,所以需要编写UserMapperImpl实现类将其赋值,代码如下:UserMapperImpl.java
public class UserMapperImpl implements UserMapper{
private SqlSessionTemplate sqlSessionTemplate;
public void setSqlSessionTemplate(SqlSessionTemplate sqlSessionTemplate) {
this.sqlSessionTemplate = sqlSessionTemplate;
}
@Override
public List<User> selectUser() {
UserMapper mapper = sqlSessionTemplate.getMapper(UserMapper.class);
return mapper.selectUser();
}
}
基本完成,进行测试:MyTest.java
@Test
public void test1(){
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
UserMapper userMapper = context.getBean("userMapperImpl", UserMapper.class);
List<User> users = userMapper.selectUser();
for (User user : users) {
System.out.println(user);
}
}