springboot 学习笔记（六）

1.springboot事务的开启

1.首先在主main类上添加开启事务的注解@EnableTransactionManagement

@SpringBootApplication
@MapperScan("com.example.demo.mapper")
@EnableTransactionManagement
public class DemoApplication {

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

}

2.在service上开启事务注解@Transactional

StudentService

public interface StudentService {

    int update();
}

StudentImpl

@Service
public class StudentImpl implements StudentService {


    @Autowired
    private StudentMapper studentMapper;

    @Transactional
    @Override
    public int update() {
        Student student = new Student();
        student.setName("123");
        student.setAddress("武汉");
        int update = studentMapper.updateByPrimaryKey(student);
        System.out.println(update);
        int i= 10/ 0;
        return update;
    }

}

这里studentMapper.updateByPrimaryKey是由mybatis插件自动生成的修改方法

MybatisController

@RestController
public class MybatisController {
    
    @Autowired
    private StudentService studentService;
   @RequestMapping("/update")
    public Object update(){
        return studentService.update();
   }
}

此时运行主main类 在浏览器上输入对应的路径就可以在控制台得到输出1 以及by zero的报错查看数据库 并没有修改 表示事务已经开启成功 报错回滚