SpringBoot

        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
            2.2.0
        
        
            mysql
            mysql-connector-java
            runtime
        

@Mapper
@Repository
public interface UserMapper {
    List query();
}

    
        select * from bookuser;
    

mybatis:
  type-aliases-package: com.aguo.pojo
  mapper-locations: classpath:mybatis/mapper/*.xml

    @Autowired
    UserMapper userMapper;

在方法体上加入@transactional注解即可！

@Service
public class UserService {
    @Autowired
    UserMapper userMapper;

    @Transactional
    List query(){
        return null;
    }
}