spring-mybatis-01

在 pom.xml 中加入

        <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

 整合：

1、引入Spring配置文件applicationContext.xml

<?xml version="1.0" encoding="GBK"?>
<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"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
        https://www.springframework.org/schema/beans/spring-beans.xsd 
        http://www.springframework.org/schema/aop 
        https://www.springframework.org/schema/aop/spring-aop.xsd 
        http://www.springframework.org/schema/context 
        https://www.springframework.org/schema/context/spring-context.xsd">

    <aop:aspectj-autoproxy/>
    <context:annotation-config/>


</beans>

2、配置数据源替换mybaits的数据源

    <!--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：-->

    <bean id="datasource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
        <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
        <property name="url" value="jdbc:mysql://localhost:3306/mybatis?useUnicode=true&amp;characterEncoding=utf8&amp;serverTimezone=GMT%2B8&amp;useSSL=false"/>
        <property name="username" value="root"/>
        <property name="password" value="12345"/>
    </bean>

3、配置SqlSessionFactory，关联MyBatis

    <!--sqlSessionFactory-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="datasource"/>
<!--    绑定mybatis配置文件-->
    <property name="configLocation" value="classpath:mybatis-config.xml"/>
    <property name="mapperLocations" value="classpath:com/lu/mapper/*.xml"/>
</bean>

4、注册sqlSessionTemplate，关联sqlSessionFactory

    <!--SqlSessionTemplate:就是我们使用的sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--只能使用构造器注入sqlSessionFactory，因为它没有set方法-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

5、需要UserMapper接口的UserMapperImpl 实现类，私有化sqlSessionTemplate

       5. 1、UserMapper

        

public interface UserMapper {
    List<User> selectUser();
}

         5.2、UserMapper.xml  编写sql语句

<?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">

<!--        namespace=绑定一个对应的Dao/Mapper接口-->
<mapper namespace="com.lu.mapper.UserMapper">
    <!--    查询语句-->
    <select id="selectUser" resultType="com.lu.pojo.User">
        select * from mybatis.user
    </select>

</mapper>

        5.3、UserMapperImpl 实现类

public class UserMapperImpl implements UserMapper{
//我们的所有操作，都使用sqlSession来执行，在原来，现在都使用SqlsessionTemplate
    private SqlSessionTemplate sqlSession;

    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }

    public List<User> selectUser() {
        UserMapper mapper = sqlSession.getMapper(UserMapper.class);
        List<User> users = mapper.selectUser();
        return users;
    }
}

6、将自己写的实现类，注入到Spring配置文件applicationContext.xml中。

    <bean id="userMapper" class="com.lu.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

7、测试

public class MyspringTest {
    public static void main(String[] args) {

        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
        List<User> users = userMapper.selectUser();
        for (User user : users){
            System.out.println(user);
        }
    }