mybaties-plus自动填充字段

1. 准备工作

<!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus-boot-starter -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus-boot-starter</artifactId>
    <version>3.5.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.baomidou/mybatis-plus -->
<dependency>
    <groupId>com.baomidou</groupId>
    <artifactId>mybatis-plus</artifactId>
    <version>3.5.1</version>
</dependency>

2. 实体类

2.1 公用实体类

@Data
public class BaseEntity implements Serializable {

    @TableField(value = "create_time", fill = FieldFill.INSERT)
    @ApiModelProperty(value = "创建时间")
    private Date createTime;

    @TableField(value = "update_time", fill = FieldFill.INSERT_UPDATE)
    @ApiModelProperty(value = "更新时间")
    private Date updateTime;
}

2.2 实体

@TableName(value ="role")
@Data
public class Role extends BaseEntity implements Serializable {

    @TableId(value = "role_id")
    @ApiModelProperty(value = "主键id")
    private String roleId;

    @ApiModelProperty(value = "角色名称")
    private String name;

    @ApiModelProperty(value = "状态")
    private Integer status;
}

3 自定义实现类 MyMetaObjectHandler:

@Slf4j
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {

    private static final Logger LOG = LoggerFactory.getLogger(MyMetaObjectHandler.class);

    private static final String CREATE_TIME = "createTime";
    private static final String UPDATE_TIME = "updateTime";

    /**
     * 创建时间
     */
    @Override
    public void insertFill(MetaObject metaObject) {
        LOG.info(" -------------------- start insert fill ...  --------------------");
        if (metaObject.hasGetter(CREATE_TIME) && metaObject.hasGetter(UPDATE_TIME)) {
            setFieldValByName(CREATE_TIME, new Date(), metaObject);
            setFieldValByName(UPDATE_TIME, new Date(), metaObject);
        }
    }

    /**
     * 更新时间
     */
    @Override
    public void updateFill(MetaObject metaObject) {
        LOG.info(" -------------------- start update fill ...  --------------------");
        if (metaObject.hasGetter(UPDATE_TIME)) {
            setFieldValByName(UPDATE_TIME, new Date(), metaObject);
        }
    }
}