步骤

导入相关jar包

junit
mybatis
mysql驱动
spring相关
aop织入
mybatis-spring

编写配置文件
测试

代码示例

准备一个可运行发Mybatis项目
编写spring-dao.xml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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">

    <!--DataSource:使用Spring数据源替换Mybatis配置 druid c3p0 dbcp
    我们这里使用Spring提供的JDBC
    抽离了原本Mybatis管理的数据源
    -->
    <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/mydb?useSSL=false"/>
        <property name="username" value="root"/>
        <property name="password" value="140246"/>
    </bean>

    <!--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/bkms/mapper/*.xml"/>
    </bean>

    <!--sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--使用构造器注入-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

</beans>

编写实现类

package com.bkms.mapper;

import com.bkms.pojo.User;
import org.mybatis.spring.SqlSessionTemplate;

import java.util.List;

public class UserServiceImpl implements UserMapper{
    private SqlSessionTemplate sqlSession;

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

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

编写applicationContext.xml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
        https://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop
        https://www.springframework.org/schema/aop/spring-aop.xsd">

    <import resource="spring-dao.xml"/>

    <!--userMapper-->
    <bean id="userMapper" class="com.bkms.mapper.UserServiceImpl">
        <property name="sqlSession" ref="sqlSession"/>
    </bean>

</beans>

测试

import com.bkms.mapper.UserMapper;
import com.bkms.pojo.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.io.IOException;
import java.util.List;

public class MyTest {
    @Test
    public void testQueryAllUser () throws IOException {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);
        List<User> users = userMapper.queryAllUser();
        for (User user : users) {
            System.out.println(user);
        }
    }
}

声明式事务

一组业务要么成功，要么失败
事务在项目开发中十分重要，涉及到数据一致性问题，不能马虎
确保完整性和一致性
事务的ACID原则
原子性，一致性，
隔离性：多个业务操作同一资源，保证业务不被损坏
持久性：事务一旦被提交，无论系统发生什么，都不会影响结果

首先要明确2个概念
数据库向用户提供保存当前程序状态的方法，叫事务提交（commit）；当事务执行过程中，使数据库忽略当前的状态并回到前面保存的状态的方法叫事务回滚（rollback）

导入并配置声明式事务

<?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"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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/tx
        https://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--DataSource:使用Spring数据源替换Mybatis配置 druid c3p0 dbcp
    我们这里使用Spring提供的JDBC
    抽离了原本Mybatis管理的数据源
    -->
    <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/mydb?useSSL=false"/>
        <property name="username" value="root"/>
        <property name="password" value="140246"/>
    </bean>

    <!--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/bkms/mapper/*.xml"/>
    </bean>

    <!--sqlSession-->
    <bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
        <!--使用构造器注入，index="0"指的是实现类中的sqlSession的成员变量-->
        <constructor-arg index="0" ref="sqlSessionFactory"/>
    </bean>

    <!--配置声明式事务，事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="datasource"/>
     </bean>

    <!--结合AOP实现事务通知-->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <!--给哪些方法配置事务-->
        <tx:attributes>
            <!--最常见的事务传播行为，如果没有事务就新建一个事务，如果已经存在一个事务中，加入到这个事务中-->
            <tx:method name="queryAllUser" propagation="REQUIRED"/>
            <tx:method name="incrementUser" propagation="REQUIRED"/>
            <tx:method name="deleteUser" propagation="REQUIRED"/>
        </tx:attributes>
    </tx:advice>

    <!--配置事务切入-->
    <aop:config>
        <aop:pointcut id="txpointcut" expression="execution(* com.bkms.mapper.*.*(..))"/>
        <aop:advisor advice-ref="txAdvice" pointcut-ref="txpointcut"/>
    </aop:config>

</beans>

编写Mapper.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.bkms.mapper.UserMapper">
    <!--查询全部用户-->
    <select id="queryAllUser" resultType="user">
        select * from info
    </select>

    <!--增加一个用户-->
    <insert id="incrementUser" parameterType="user">
        insert into info (id,name,email) values (#{id},#{name},#{email})
    </insert>

    <!--删除一个用户-->
    <delete id="deleteUser" parameterType="int">
        delete from info where id=#{id}
    </delete>
</mapper>

编写测试

public class MyTest {
    @Test
    public void testQueryAllUser () throws IOException {
        ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
        UserMapper userMapper = context.getBean("userMapper", UserMapper.class);

        //执行完增加操作，删除操作失败，事务并没有回滚
        userMapper.incrementUser(new User(9, "Joe", "Joecffduw@3543.wh"));
        userMapper.deleteUser(1);
        List<User> users = userMapper.queryAllUser();

        for (User user : users) {
            System.out.println(user);
        }
    }
}