如何使用mybatis helper进行数据校验

MyBatis-Plus Helper ??? MyBatis-Plus ????,???????????,??? Mapper??? Service??????????,????????? MyBatis-Plus Helper ???????

1. ????

??,????????? MyBatis-Plus Helper ????? Maven ??? pom.xml ?????????:

   com.baomidou
   mybatis-plus-extension
   3.x.x

?? 3.x.x ??????????

2. ?????

???????,??? JSR-303(Java ????)???????????:

import javax.validation.constraints.NotBlank;
import javax.validation.constraints.Size;

public class User {
    private Long id;

    @NotBlank(message = "???????")
    @Size(min = 4, max = 20, message = "????????4?20?????")
    private String username;

    // ????? getter/setter ??
}

3. ?? Mapper ??

??????? BaseMapper ? Mapper ??:

import com.baomidou.mybatisplus.core.mapper.BaseMapper;

public interface UserMapper extends BaseMapper {
}

4. ?? Service ??????

???? Service ??,??? IService:

import com.baomidou.mybatisplus.extension.service.IService;

public interface UserService extends IService {
}

?????? UserService ????:

import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;

@Service
public class UserServiceImpl extends ServiceImpl implements UserService {
}

5. ? Controller ??? Service

? Controller ?,???? Service ?????????????,??????:

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;

    @PostMapping("/create")
    public ResponseEntity createUser(@Valid @RequestBody User user) {
        boolean result = userService.save(user);
        if (result) {
            return ResponseEntity.ok("??????");
        } else {
            return ResponseEntity.badRequest().body("??????");
        }
    }
}

??????,???????? POST ??? /user/create ?,@Valid ??????????????????,???????????????????????,??? userService.save() ?????????

??,?????? MyBatis-Plus Helper ???????????? MyBatis-Plus Helper ???,???????:https://mybatis.plus/guide/wrapper.html#数据校验