Application.yml 配置

mybatis-plus:
  configuration:
    call-setters-on-nulls: true #设置当查询结果值为null时，同样映射该查询字段给map。
    map-underscore-to-camel-case: false # 数据库下划线自动转驼峰标示关闭
    auto-mapping-behavior: full
# log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  mapper-locations: classpath*:/mapper/*Mapper.xml,classpath*:/mapper/custom/*.xml
  global-config:
    # 逻辑删除配置
    db-config:
      # 逻辑删除字段
      logic-delete-field: deleted
      # 删除前
      logic-not-delete-value: 0
      # 删除后
      logic-delete-value: 1

模型

/**
     * 是否删除 0：正常 1：已删除
     */
    @TableField(value = "deleted")
    private Byte deleted;

    /**
     * 创建用户
     */
    @TableField(value = "create_by", fill = FieldFill.INSERT)
    private Long createBy;

    /**
     * 更新用户
     */
    @TableField(value = "update_by", fill = FieldFill.UPDATE)
    private Long updateBy;

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

    /**
     * 更新时间
     */
    @TableField(value = "update_time", fill = FieldFill.UPDATE)
    private Date updateTime;

新建配置自动填充文件 MyMetaObjectHandler

package com.zyy.config;

import cn.hutool.core.date.DateTime;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import com.zyy.utils.SecurityUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;

/**
 * @author zhouhao
 * @version 1.0
 * @description: 自动填充功能
 * @date 2021/4/28 15:00
 */
@Slf4j
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {


    @Override
    public void insertFill(MetaObject metaObject) {
        // 创建时间和更新时间都插入
        Object created = getFieldValByName("createTime", metaObject);
        if (null == created) {
            // 字段为空，可以进行填充
            setFieldValByName("createTime", DateTime.now(), metaObject);
        }

        Object updated = getFieldValByName("updateTime", metaObject);
        if (null == updated) {
            // 字段为空，可以进行填充
            setFieldValByName("updateTime", DateTime.now(), metaObject);
        }
        this.setFieldValByName("createBy",SecurityUtils.getCurrentUserId(), metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime", DateTime.now(), metaObject);
        this.setFieldValByName("updateBy",SecurityUtils.getCurrentUserId(), metaObject);
    }
}

MyBatis-Plus 字段自动注入