@TableField fill

参考mybatis-plus官网的手册

https://mp.baomidou.com/guide/annotation.html#tablefield

FieldFill

默认值是：FieldFill.DEFAULT

 一般在JAVA 数据库持久化类DTO中定义，为了在数据insert、update时，能够自动填充

    @TableField(
        value = "create_time",
        fill = FieldFill.INSERT
    )
    private Date createTime;
    @TableField(
        value = "create_user",
        fill = FieldFill.INSERT
    )
    private Long createUser;
    @TableField(
        value = "update_time",
        fill = FieldFill.UPDATE
    )
    private Date updateTime;
    @TableField(
        value = "update_user",
        fill = FieldFill.UPDATE
    )
    private Long updateUser;

配置完成后，就是解决在哪里触发填充的事，它是通过定义拦截器xxx，继承mybatis-plus core中的接口MetaObjectHandler，插入时填充操作卸载insertFill，依次类推。

/**
 * 自动补充插入或更新时的值
 * 
 */
@Component
public class CustomMetaObjectHandler implements MetaObjectHandler {
    private static final Logger log = LoggerFactory.getLogger(CustomMetaObjectHandler.class);
 
    public CustomMetaObjectHandler() {
    }
 
    public void insertFill(MetaObject metaObject) {
        try {
            this.setFieldValByName("createUser", this.getUserUniqueId(), metaObject);
            this.setFieldValByName("createTime", new Date(), metaObject);
            this.setFieldValByName("delFlag", YesOrNotEnum.N.getCode(), metaObject);
            this.setFieldValByName("statusFlag", StatusEnum.ENABLE.getCode(), metaObject);
        } catch (ReflectionException var3) {
            log.warn("CustomMetaObjectHandler处理过程中无相关字段，不做处理");
        }
 
    }
 
    public void updateFill(MetaObject metaObject) {
        try {
            this.setFieldValByName("updateUser", this.getUserUniqueId(), metaObject);
            this.setFieldValByName("updateTime", new Date(), metaObject);
        } catch (ReflectionException var3) {
            log.warn("CustomMetaObjectHandler处理过程中无相关字段，不做处理");
        }
 
    }
}