springboot+mybatis实现乐观锁

/*货物表*/
CREATE TABLE `goods` (
  `id` int NOT NULL AUTO_INCREMENT COMMENT '商品id',
  `goods_name` varchar(255) DEFAULT NULL COMMENT '商品名称',
  `stock` int DEFAULT '0' COMMENT '商品库存',
  `add_time` timestamp NULL DEFAULT NULL COMMENT '添加时间',
  `update_time` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '修改时间',
  `version` int DEFAULT '0' COMMENT '版本，用于乐观锁实现',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;
/*加入一条商品信息 */
insert  into `goods`(`id`,`goods_name`,`stock`,`add_time`,`update_time`,`version`) values (1,'1',0,'2020-09-01 17:53:06','2020-09-02 15:50:28',50);
/*订单表 */
CREATE TABLE `order` (
  `id` int NOT NULL AUTO_INCREMENT,
  `goods_name` varchar(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci DEFAULT NULL,
  `add_time` timestamp NULL DEFAULT NULL,
  `update_time` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1466 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

package com.example.demo.entity;
import java.util.Date;
import java.time.LocalDateTime;
public class GoodsEntity {
    private Integer id;
    private String goodsName;
    private Integer stock;
    private Integer version;
    private Date addTime;
    private Date updateTime;
    public Integer getStock() {
        return stock;
    }
    public void setStock(Integer stock) {
        this.stock = stock;
    }
    public Integer getVersion() {
        return version;
    }
    public void setVersion(Integer version) {
        this.version = version;
    }
    public Date getAddTime() {
        return addTime;
    }
    public void setAddTime(Date addTime) {
        this.addTime = addTime;
    }
    public Date getUpdateTime() {
        return updateTime;
    }
    public void setUpdateTime(Date updateTime) {
        this.updateTime = updateTime;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getGoodsName() {
        return goodsName;
    }
    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }
    @Override
    public String toString() {
        return "GoodsEntity{" +
                "id=" + id +
                ", goodsName='" + goodsName + '\'' +
                ", stock=" + stock +
                ", addTime=" + addTime +
                ", updateTime=" + updateTime +
                '}';
    }
}