史上最全Spring教程，从零开始带你深入♂学习，一文搞懂JVM架构

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        <version>5.3.6</version>

    </dependency>

    <dependency>

        <groupId>org.aspectj</groupId>

        <artifactId>aspectjweaver</artifactId>

        <version>1.9.4</version>

    </dependency>

    <!-- https://mvnrepository.com/artifact/org.mybatis/mybatis-spring -->

    <dependency>

        <groupId>org.mybatis</groupId>

        <artifactId>mybatis-spring</artifactId>

        <version>2.0.6</version>

    </dependency>

    <dependency>

        <groupId>org.projectlombok</groupId>

        <artifactId>lombok</artifactId>

        <version>1.18.8</version>

    </dependency>

</dependencies>



<build>

    <resources>

        <resource>

            <directory>src/main/resources</directory>

            <includes>

                <include>**/*.properties</include>

                <include>**/*.xml</include>

            </includes>

            <filtering>true</filtering>

        </resource>

        <resource>

            <directory>src/main/java</directory>

            <includes>

                <include>**/*.properties</include>

                <include>**/*.xml</include>

            </includes>

            <filtering>true</filtering>

        </resource>

    </resources>

</build>



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### [](
)编写实体类（需要导入lombok依赖）

package com.study.pojo;

import lombok.AllArgsConstructor;

import lombok.Data;

import lombok.NoArgsConstructor;

@Data

@AllArgsConstructor

@NoArgsConstructor

public class User {

private int id;//加群1025684353一起吹水聊天

private String name;

private String pwd;

}



### [](
)编写实现接口

package com.study.mapper;

import com.study.pojo.User;

import java.util.List;

public interface UserMapper {

public List<User> selectUser();

//添加一个用户

int addUser(User user);//加群1025684353一起吹水聊天

//根据id删除用户

int deleteUser(int id);

}



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### [](
)编写配置文件



**UserMapper.xml**



**注意：delete故意写错**

<?xml version="1.0" encoding="UTF-8" ?>

<select id="selectUser" resultType="user">

    select * from mybatis.user

</select>

<insert id="addUser" parameterType="user">

    insert into mybatis.user(id, name, pwd) values (#{id},#{name},#{pwd})

</insert>

<delete id="deleteUser" parameterType="int">

    deletes from mybatis.user where id=#{id}

</delete>



**spring-dao.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: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.xsd

   http://www.springframework.org/schema/aop

   http://www.springframework.org/schema/aop/spring-aop.xsd

   http://www.springframework.org/schema/tx

   http://www.springframework.org/schema/tx/spring-tx.xsd">



<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=false&amp;useUnicode=true&amp;characterEncoding=UTF-8"/>

    <property name="username" value="root"/>

    <property name="password" value="123456"/>

</bean>



<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="classpath:com/study/mapper/*.xml"/>

</bean>



<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">

    <constructor-arg index="0" ref="sqlSessionFactory"/>

</bean>



**mybatis-config.xml**

<?xml version="1.0" encoding="UTF-8" ?>

<typeAliases>

    <package name="com.study.pojo"/>

</typeAliases>



**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"

   xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

<bean id="userMapper" class="com.study.mapper.UserMapperImpl">

    <property name="sqlSessionFactory" ref="sqlSessionFactory"/>

</bean>



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### [](
)编写接口实现类

package com.study.mapper;

import com.study.pojo.User;

import org.mybatis.spring.SqlSessionTemplate;

import org.mybatis.spring.support.SqlSessionDaoSupport;

import java.util.List;//加群1025684353一起吹水聊天

public class UserMapperImpl extends SqlSessionDaoSupport implements UserMapper{

@Override

public List<User> selectUser() {

    User user =new User(30,"bbb","123456");

    UserMapper mapper = getSqlSession().getMapper(UserMapper.class);

    mapper.addUser(user);

    mapper.deleteUser(30);

    return mapper.selectUser();

}



@Override

public int addUser(User user) {

    return getSqlSession().getMapper(UserMapper.class).addUser(user);

}



@Override

public int deleteUser(int id) {//加群1025684353一起吹水聊天

    return getSqlSession().getMapper(UserMapper.class).deleteUser(id);

}

}



### [](
)编写测试类



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import com.study.mapper.UserMapper;

import com.study.pojo.User;

import org.springframework.context.ApplicationContext;

import org.springframework.context.support.ClassPathXmlApplicationContext;

import java.util.List;

public class MyText {//加群1025684353一起吹水聊天

public static void main(String[] args) {

    ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");

    UserMapper userMapper = context.getBean("userMapper", UserMapper.class);

    List<User> userList = userMapper.selectUser();

    for (User user : userList) {

        System.out.println(user);

    }

}

}



### [](
)测试



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**运行测试前数据库**  

[![image](https://www.www.zyiz.net/i/ll/?i=img_convert/965289111447421a7ebc560745f3d169.png)](
)



**运行测试出错**  

[![image](https://www.www.zyiz.net/i/ll/?i=img_convert/348c67d4aa1ed90e5609532dffbd91f9.png)](
)



**刷新数据库数据添加成功**  

[![image](https://www.www.zyiz.net/i/ll/?i=img_convert/e50b39e9fa6d05b4a3c9c90beef85ee3.png)](
)



**在程序开发中，这样的BUG重的,所以我们需要在spring中开启事务防止这样的漏洞发生**



[](
)在spring中使用事务

===========================================================================



### [](https://gitee.com/vip204888/java-p7)一、在spring配置文件开启JDBC事务

    <property name="dataSource" ref="dataSource" />



### [](https://gitee.com/vip204888/java-p7)二、配置好事务管理器后我们需要去配置事务的通知



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<tx:advice id=“txAdvice” transaction-manager=“transactionManager”>

<tx:attributes>

    <!--给哪些方法配置事务-->

    <!--配置事务的传播特性 propagation:默认REQUIRED-->

    <tx:method name="add" propagation="REQUIRED"/>

    <tx:method name="delete" propagation="REQUIRED"/>

    <tx:method name="update" propagation="REQUIRED"/>

    <!--read-only:只读-->

    <tx:method name="select" read-only="true"/>

    <tx:method name="*" propagation="REQUIRED"/>

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   <tx:method name="add" propagation="REQUIRED"/>

    <tx:method name="delete" propagation="REQUIRED"/>

    <tx:method name="update" propagation="REQUIRED"/>

    <!--read-only:只读-->

    <tx:method name="select" read-only="true"/>

    <tx:method name="*" propagation="REQUIRED"/>

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