springboot+mybatis+mysql事务

一、通过maven加载类库

<parent>
    <artifactId>spring-boot-parent</artifactId>
    <groupId>org.springframework.boot</groupId>
    <version>2.1.16.RELEASE</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jdbc</artifactId>
    </dependency>



    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.21</version>
    </dependency>


    <dependency>
        <groupId>org.mybatis.spring.boot</groupId>
        <artifactId>mybatis-spring-boot-starter</artifactId>
        <version>1.3.2</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
    <dependency>
        <groupId>org.projectlombok</groupId>
        <artifactId>lombok</artifactId>
        <version>1.18.12</version>
        <scope>provided</scope>
    </dependency>


</dependencies>

<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

二、建立目录结构

三、修改配置

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/demo?useUnicode=true&characterEncoding=utf-8&useLegacyDatetimeCode=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=111111

mybatis.type-aliases-package=com.aliyun.edu.dxh
mybatis.mapper-locations=classpath*:mappers/*.xml

四、编写控制器、业务、PO、mapper、xml：

4.1 控制器：

@RestController
@RequestMapping("/student")
public class StudentController {
    @Autowired
    private StudentService studentService;

    @RequestMapping("/detail")
    public Student detail(@RequestParam("id") Long id) {
        return studentService.detail(id);
    }


    @RequestMapping("/modify")
    public int modify() {
        return studentService.modifyStudentAddress(1L, "test-4", 1L, "chinese-4");
    }

}

4.2 编写service

4.2.1 service的接口层

public interface StudentService {

    public Student detail(Long id);

    int modifyStudentAddress(Long studentId, String address, Long sourceId, String sourceName);
}

4.2.2 service的实现层

@Service
public class StudentServiceImpl implements StudentService {
    @Resource
    private StudentMapper studentMapper;

    @Resource
    private SourceMapper sourceMapper;

    public Student detail(Long id) {
        return studentMapper.detail(id);
    }

    @Transactional
    public int modifyStudentAddress(Long studentId, String address, Long sourceId, String sourceName) {
        studentMapper.modifyStudentAddress(studentId, address);
        int a = 1/0;
        sourceMapper.modifySource(sourceId, sourceName);

        return 1;
    }
}

4.3 mapper层

4.3.1 SourceMapper.java (课程表对应的mapper接口)

@Mapper
public interface SourceMapper {


    public int modifySource(@Param("sourceId") Long sourceId, @Param("sourceName") String sourceName);

}

4.3.2 StudentMapper.java (学生信息表对应的mapper接口)

@Mapper
public interface StudentMapper {

    public Student detail(@Param("studentId") Long id);

    public int modifyStudentAddress(@Param("studentId") Long id, @Param("address") String address);



}

4.4 po（持久化对象：表对应的实体类）

4.4.1 Source.java (课程表对应的实体类)

@Data
public class Source {

    private Long id;
    private String sourceName;
    private String isDelete;

}

4.4.2 Student.java（学生表对应的实体类)

@Data
public class Student {

    private Long id;
    private String name;
    private String sex;
    private String address;

}

4.5、数据库操作对应的XML（resources/mappers)

4.5.1 SourceMapper.xml

<?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.aliyun.edu.dxh.mapper.SourceMapper">

    <resultMap id="student" type="com.aliyun.edu.dxh.po.Source">
        <id column="id" jdbcType="BIGINT" property="id"/>
        <id column="source_name" jdbcType="VARCHAR" property="sourceName"/>
        <id column="is_delete" jdbcType="VARCHAR" property="isDelete"/>
    </resultMap>


    <update id="modifySource">
        update source
        set source_name=#{sourceName}
        where id=#{sourceId}
    </update>

</mapper>

4.5.2 StudentMapper.xml

<?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.aliyun.edu.dxh.mapper.StudentMapper">

    <resultMap id="student" type="com.aliyun.edu.dxh.po.Student">
        <id column="id" jdbcType="BIGINT" property="id"/>
        <id column="name" jdbcType="VARCHAR" property="name"/>
        <id column="sex" jdbcType="VARCHAR" property="sex"/>
        <id column="address" jdbcType="VARCHAR" property="address"/>
    </resultMap>

    <select id="detail"  resultType="student">
        select id,name,sex,address
        from student
        where id = #{studentId}
    </select>


    <update id="modifyStudentAddress">
        update student
        set address=#{address}
        where id=#{studentId}
    </update>
</mapper>

五、主应用类

@SpringBootApplication
//@EnableTransactionManagement
public class SpringbootMybatisTx {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootMybatisTx.class, args);
    }
}