1.pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.7.3</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.it</groupId><artifactId>019-springboot-transactional</artifactId><version>0.0.1-SNAPSHOT</version><name>019-springboot-transactional</name><description>Demo project for Spring Boot</description><properties><java.version>1.8</java.version></properties><dependencies><!--web的起步依赖--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--mybatis的起步依赖--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.2.2</version></dependency><!--mysql驱动--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><!--测试--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency></dependencies><build><!--处理资源目录--><resources><resource><directory>src/main/resources</directory><includes><include>**/*.*</include></includes></resource></resources><plugins><!--mybatis代码自动生成插件--><plugin><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-maven-plugin</artifactId><version>1.3.6</version><configuration><!--配置文件的位置：在项目的根目录下，和src是平级的--><configurationFile>GeneratorMapper.xml</configurationFile><verbose>true</verbose><overwrite>true</overwrite></configuration></plugin><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

2.添加GeneratorMapper.xml在整个项目的根目录下

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfigurationPUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN""http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd"><generatorConfiguration><!-- 指定连接数据库的JDBC驱动包所在位置，指定到你本机的完整路径 --><classPathEntry location="D:\jsp\MySql数据库软件\mysql-connector-java-5.1.48\mysql-connector-java-5.1.48.jar"/><!-- 配置table表信息内容体，targetRuntime指定采用MyBatis3的版本 --><context id="tables" targetRuntime="MyBatis3"><!-- 抑制生成注释，由于生成的注释都是英文的，可以不让它生成 --><commentGenerator><property name="suppressAllComments" value="true" /></commentGenerator><!-- 配置数据库连接信息 --><jdbcConnection driverClass="com.mysql.jdbc.Driver"connectionURL="jdbc:mysql://localhost:3306/springboot1"userId="root"password="输入你的数据库连接密码"></jdbcConnection><!-- 生成model类，targetPackage指定model类的包名， targetProject指定生成的model放在eclipse的哪个工程下面--><javaModelGenerator targetPackage="com.it.model"targetProject="D:\JAVA互联网分布式\springBoot2Test\019-springboot-transactional\src\main\java"><property name="enableSubPackages" value="false" /><property name="trimStrings" value="false" /></javaModelGenerator><!-- 生成MyBatis的Mapper.xml文件，targetPackage指定mapper.xml文件的包名， targetProject指定生成的mapper.xml放在eclipse的哪个工程下面 --><sqlMapGenerator targetPackage="mapper" targetProject="src\main\resources"><property name="enableSubPackages" value="false" /></sqlMapGenerator><!-- 生成MyBatis的Mapper接口类文件,targetPackage指定Mapper接口类的包名， targetProject指定生成的Mapper接口放在eclipse的哪个工程下面 --><javaClientGenerator type="XMLMAPPER" targetPackage="com.it.dao" targetProject="src/main/java"><property name="enableSubPackages" value="false" /></javaClientGenerator><!-- 数据库表名及对应的Java模型类名 --><table tableName="student" domainObjectName="Student"enableCountByExample="false"enableUpdateByExample="false"enableDeleteByExample="false"enableSelectByExample="false"selectByExampleQueryId="false"/></context></generatorConfiguration>

 3.点击mybatis逆向工程的插件，自动生成model包下的实体类Studnet

package com.it.model;public class Student {private Integer id;private String name;private Integer age;public Integer getId() {return id;}public void setId(Integer id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public Integer getAge() {return age;}public void setAge(Integer age) {this.age = age;}
}

4.mybatis逆向工程插件自动生成dao包下的StudentMapper接口

package com.it.dao;import com.it.model.Student;public interface StudentMapper {int deleteByPrimaryKey(Integer id);int insert(Student record);int insertSelective(Student record);Student selectByPrimaryKey(Integer id);int updateByPrimaryKeySelective(Student record);int updateByPrimaryKey(Student record);
}

5.mybatis逆向工程插件自动生成resources目录下的mapper包下的StudentMapper.xml文件

<?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.it.dao.StudentMapper"><resultMap id="BaseResultMap" type="com.it.model.Student"><id column="id" jdbcType="INTEGER" property="id" /><result column="name" jdbcType="VARCHAR" property="name" /><result column="age" jdbcType="INTEGER" property="age" /></resultMap><sql id="Base_Column_List">id, name, age</sql><select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">select <include refid="Base_Column_List" />from studentwhere id = #{id,jdbcType=INTEGER}</select><delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">delete from studentwhere id = #{id,jdbcType=INTEGER}</delete><insert id="insert" parameterType="com.it.model.Student">insert into student (id, name, age)values (#{id,jdbcType=INTEGER}, #{name,jdbcType=VARCHAR}, #{age,jdbcType=INTEGER})</insert><insert id="insertSelective" parameterType="com.it.model.Student">insert into student<trim prefix="(" suffix=")" suffixOverrides=","><if test="id != null">id,</if><if test="name != null">name,</if><if test="age != null">age,</if></trim><trim prefix="values (" suffix=")" suffixOverrides=","><if test="id != null">#{id,jdbcType=INTEGER},</if><if test="name != null">#{name,jdbcType=VARCHAR},</if><if test="age != null">#{age,jdbcType=INTEGER},</if></trim></insert><update id="updateByPrimaryKeySelective" parameterType="com.it.model.Student">update student<set><if test="name != null">name = #{name,jdbcType=VARCHAR},</if><if test="age != null">age = #{age,jdbcType=INTEGER},</if></set>where id = #{id,jdbcType=INTEGER}</update><update id="updateByPrimaryKey" parameterType="com.it.model.Student">update studentset name = #{name,jdbcType=VARCHAR},age = #{age,jdbcType=INTEGER}where id = #{id,jdbcType=INTEGER}</update>
</mapper>

6.设置项目核心配置文件application.properties文件

#设置端口
server.port=9002
server.servlet.context-path=/mytrans#配置数据库
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/springboot1?useUnicode=true&characterEncoding=UTF-8&serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=123456#配置mybatis
mybatis.mapper-locations=classpath:mapper/*.xml#开启日志
mybatis.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

7.设置业务接口StudnetService

8.实现业务接口StudentServiceImpl类，在这里设置事务处理

package com.it.service.impl;import com.it.dao.StudentMapper;
import com.it.model.Student;
import com.it.service.StudentService;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;import javax.annotation.Resource;@Service
public class StudentServiceImpl implements StudentService {@Resourceprivate StudentMapper studentMapper;/*@Transactional:表示方法有事务的支持默认：使用数据库的隔离级别，传播行为：REQUIRED，超时时间：-1抛出运行时异常，回滚事务*/@Transactional@Overridepublic int addStudent(Student student) {System.out.println("业务方法addStudent");int i = studentMapper.insert(student);System.out.println("执行sql语句");//抛出一个运行时异常，目的是回滚事务
//        int m=10/0;return i;}
}

9.设置controller层的StudnetController类

package com.it.controller;import com.it.model.Student;
import com.it.service.StudentService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;import javax.annotation.Resource;@Controller
public class StudentController {@Resourceprivate StudentService studentService;@RequestMapping("/addStudent")@ResponseBodypublic String addStudent(String name,Integer age){Student student = new Student();student.setName(name);student.setAge(age);int i = studentService.addStudent(student);return "添加学生："+i;}}

10.设置主入口函数的配置，添加mapper扫描注解和事务管理注解

package com.it;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.transaction.annotation.EnableTransactionManagement;/*** @EnableTransactionManagement:启用事务管理器*/
@SpringBootApplication
@EnableTransactionManagement
@MapperScan(basePackages = "com.it.dao")
public class Application {public static void main(String[] args) {SpringApplication.run(Application.class, args);}}

运行主函数进行测试

1.首先不在业务实现类编写算术异常，查看数据是否可以正常添加