1.實體類上的註解

@NoArgsConstructor
@AllArgsConstructor
@Data
public class User {

    @TableId(type = IdType.AUTO)
    private Long id;
    private String name;
    private Integer age;
    private String email;
    @TableField(fill = FieldFill.INSERT)
    private Date createTime;
    @TableField(fill = FieldFill.INSERT_UPDATE)
    
 
private Date updateTime;
}

2.對註解的處理

@Component
@Slf4j
public class MyDetaObjectHander implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
        log.info("come to insert fill .........");
        //setFieldValByName(String fieldName, Object fieldVal, MetaObject metaObject)
 

        this.setFieldValByName("createTime",new Date(),metaObject);
        this.setFieldValByName("updateTime",new Date(),metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        log.info("come to update fill .......");

        this.setFieldValByName("updateTime",new
 
 Date(),metaObject);

    }
}

3.進行新增和修改測試

 //新增使用者
    @Test
    public void addUser(){
        User user = new User();
        user.setAge(23);
        user.setEmail("[email protected]");
        user.setName("gwq");
        int insert = userDao.insert(user);
        System.out.println(insert);
    }
    @Test
    public void update(){
        User user = new User();
        user.setAge(23);
        user.setEmail("[email protected]");
        user.setName("gwq");
        user.setId(1299641789988229125L);

        int i = userDao.updateById(user);
        System.out.println(i);
    }