1、自定义实现类 MyMetaObjectHandler

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;

import java.time.LocalDateTime;

/**
 * @BelongsProject: pushService
 * @Author: Yuan Haozhe
 * @CreateTime: 2023-07-10  11:24
 * @Description: 自动填充处理器
 * @Version: 1.0
 */
@Slf4j
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {

    @Override
    public void insertFill(MetaObject metaObject) {
        log.info("start insert fill ....");
        this.strictInsertFill(metaObject, "createTime", LocalDateTime.class, LocalDateTime.now());
        this.strictInsertFill(metaObject, "updateTime", LocalDateTime.class, LocalDateTime.now());
        this.strictInsertFill(metaObject, "createBy", String.class, "admin");
        this.strictInsertFill(metaObject, "updateBy", String.class, "admin");
    }


    @Override
    public void updateFill(MetaObject metaObject) {
        log.info("start update fill ....");
        this.strictUpdateFill(metaObject, "updateTime", LocalDateTime.class, LocalDateTime.now());
        this.strictUpdateFill(metaObject, "updateBy", String.class, "admin");

    }
}

2、在entity中标记需要自动填充的属性

@Data
@TableName("sys_post")
public class PostPO {
    @TableId(type = IdType.ASSIGN_ID)
    private Long id;

    private String postCode;

    private String postName;

    private Integer status;

    private String remark;
	// 注意！这里需要标记为填充字段
    @TableField(fill = FieldFill.INSERT)
    private LocalDateTime createTime;

    @TableField(fill = FieldFill.INSERT_UPDATE)
    private LocalDateTime updateTime;

    @TableField(fill = FieldFill.INSERT)
    private String createBy;

    @TableField(fill = FieldFill.INSERT_UPDATE)
    private String updateBy;


    @TableLogic
    private Integer deleteFlag;
    private Integer revision;

3、FieldFill中有哪些字段

    /**
     * 默认不处理
     */
    DEFAULT,
    /**
     * 插入时填充字段
     */
    INSERT,
    /**
     * 更新时填充字段
     */
    UPDATE,
    /**
     * 插入和更新时填充字段
     */
    INSERT_UPDATE
}