spring整合mybatis

一、第一种方法

实体、接口、xml-sql都一样

@Data
public class User {
    private int id;
    private String name;
}
public interface UserMapper {
    List<User> getUserList();
}

<?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.xc.mapper.UserMapper">
    <select id="getUserList" resultType="com.xc.entity.User">
        select * from user
    </select>
</mapper>

实现类：之后通过xmlset注入sqlSession

public class UserMapperImpl implements UserMapper{
    private SqlSessionTemplate sqlSession;
    public void setSqlSession(SqlSessionTemplate sqlSession) {
        this.sqlSession = sqlSession;
    }
    @Override
    public List<User> getUserList() {
        UserMapper userMapper = sqlSession.getMapper(UserMapper.class);
        return userMapper.getUserList();
    }
}

spring.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:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!--DataSource:使用spring的数据源替换mybatis数据源 使用spring的jdbc-->
    <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/school?serverTimezone=UTC&amp;useUnicode=true&amp;characterEncoding=utf8&amp;useSSL=false"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>
    <!--创建sqlSessionFactory 以前在配置文件中配置，现在set注入-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:com/xc/mapper/*.xml"/>
    </bean>
    <!--创建sqlSessionTemplate 即 sqlSession 通过构造方法注入-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>
    <!--UserMapperImpl set方法注入sqlSessionTemplate-->
    <bean id="userMapperImpl" class="com.xc.mapper.UserMapperImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>
</beans>

客户端：

public class Client {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("spring.xml");
        UserMapper userMapper = (UserMapper) context.getBean("userMapperImpl");
        List<User> userList = userMapper.getUserList();
        for (User user : userList) {
            System.out.println(user);
        }
    }
}

二、第二种方法

SqlSessionDaoSupport 中getSqlSession() 即获取sqlSessionTemplate

public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper{
    @Override
    public List<User> getUserList() {
        UserMapper userMapper = getSqlSession().getMapper(UserMapper.class);
        return userMapper.getUserList();
    }
}

<?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:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context.xsd
       http://www.springframework.org/schema/tx
       http://www.springframework.org/schema/tx/spring-tx.xsd">
    <!--DataSource:使用spring的数据源替换mybatis数据源 使用spring的jdbc-->
    <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/school?serverTimezone=UTC&amp;useUnicode=true&amp;characterEncoding=utf8&amp;useSSL=false"/>
        <property name="username" value="root"/>
        <property name="password" value="123456"/>
    </bean>
    <!--创建sqlSessionFactory 以前在配置文件中配置，现在set注入-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="mapperLocations" value="classpath:com/xc/mapper/*.xml"/>
    </bean>
    <!--UserMapperImpl set方法为 SqlSessionDaoSupport 注入 sqlSessionFactory-->
    <bean id="userMapperImpl" class="com.xc.mapper.UserMapperImpl">
        <property name="sqlSessionFactory" ref="sqlSessionFactory"/>
    </bean>
</beans>