商城系统app开发如何满足不断变化的市场需求与用户期待
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2022-12-24
解决Spring或SpringBoot开启事务以后无法返回自增主键的问题
Spring或SpringBoot开启事务以后无法返回自增主键
场景:保存订单和订单详情,订单详情需要订单id,数据库中的订单表是自增主键,开启事务后,导致订单主键无法返回
1、开启事务前(以下代码只是样例,实际可能无法运行)
OrderMapper.xml配置
INSERT INTO goods_order (
order_no, shop_id, account_id, total_original_price, total_discount_price, total_price, order_status, order_source, goods_statement_no, create_time
) VALUES (
#{orderNo}, #{shopId}, #{accountId}, #{totalOriginalPrice}, #{totalDiscountPrice}, #{totalPrice}, #{orderStatus}, #{orderSource}, #{goodsStatementNo}, #{createTime}
)
INSERT INTO goods_order_detail (
order_id, goods_sku_id, goods_num, original_price, discount_price, price, create_time
) VALUES (
#{orderId}, #{skuId}, #{goodsNum}, #{originalPrice}, #{discountPrice}, #{price}, #{createTime}
)
OrderMapper.java
package cn.test.mapper;
import cn.test.pojo.dto.GoodsOrderDTO;
import cn.test.pojo.dto.GoodsOrderDetailDTO;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface OrderMapper {
/**
* 创建商品订单
*
* @param goodsOrderDTO
* @return
*/
void createGoodsOrder(GoodsOrderDTO goodsOrderDTO);
/**
* 创建商品订单详情
*
* @param goodsOrderDetailDTO
*/
void createGoodsOrderDetail(GoodsOrderDetailDTO goodsOrderDetailDTO);
}
OrderService.java
package cn.test.service;
import cn.test.pojo.vo.CreateGoodsOrderVO;
import cn.tesst.pojo.bo.CreateOrderBO;
public interface OrderService {
/**
* 创建商品订单
* @param createOrderBO
* @return
*/
CreateGoodsOrderVO createGoodsOrder(CreateOrderBO createOrderBO);
}
OrderServiceImpl.java
package cn.test.service.impl;
import cn.test.pojo.vo.CreateGoodsOrderVO;
import cn.test.pojo.bo.CreateOrderBO;
import cn.test.utils.OrdersUtil;
import cn.test.constant.enums.OrderStatusEnums;
@Service
public class OrderServiceImpl implements OrderService {
/**
* 创建商品订单
* @param createOrderBO
* @return
*/
@Override
public CreateGoodsOrderVO createGoodsOrder(CreateOrderBO createOrderBO) {
// 1 生成订单
GoodsOrderDTO goodsOrderDTO = new GoodsOrderDTO();
// 1.1 生成订单号
String orderNo = orderPrefix + OrdersUtil.createOrderNo();
// 1.2 封装订单实体类
goodsOrderDTO.setOrderNo(orderNo);
goodsOrderDTO.setShopId(shopId);
goodsOrderDTO.setAccountId(createOrderBO.getAccountId());
// 数据库按分处理
goodsOrderDTO.setTotalPrice(totalPrice);
goodsOrderDTO.setTotalOriginalPrice(totalOriginalPrice);
goodsOrderDTO.setTotalDiscountPrice(totalOriginalPrice - totalPrice);
goodsOrderDTO.setOrderSource(createOrderByShopBO.getOrderSource());
goodsOrderDTO.setOrderStatus(OrderStatusEnums.CREATE_ORDER_SUCCESS.getCode());
goodsOrderDTO.setGoodsStatementNo(statementNo);
goodsOrderDTO.setCreateTime(dateString);
// 1.3 创建订单
orderMapper.createGoodsOrder(goodsOrderDTO);
// 2 封装订单详情
GoodsOrderDetailDTO goodsOrderDetailDTO = new GoodsOrderDetailDTO();
goodsOrderDetailDTO.setOrderId(goodsOrderDTO.getOrderId()); //不开启事务可以获取到订单自增主键
goodsOrderDetailDTO.setSkuId(skuId);
goodsOrderDetailDTO.setGoodsNum(buyCounts);
goodsOrderDetailDTO.setOriginalPrice(originalPrice);
goodsOrderDetailDTO.setDiscountPrice(originalPrice - price);
goodsOrderDetailDTO.setPrice(price);
goodsOrderDetailDTO.setCreateTime(dateString);
// TODO 查询库存、nDWjLKgFVy减库存
// 2.1创建订单详情
orderMapper.createGoodsOrderDetail(goodsOrderDetailDTO);
// 3 返回订单实体类
CreateGoodsOrderVO createGoodsOrderVO = new CreateGoodsOrderVO();
createGoodsOrderVO.setOrderNo(orderNo);
createGoodsOrderVO.setTotalPrice(totalPrice);
createGoodsOrderVO.setCreateTime(dateString);
return createGoodsOrderVO;
}
}
2、开启事务后(只修改了OrderMapper.xml和OrderServiceImpl.java)
OrderMapper.xml
SELECT LAST_INSERT_ID()
INSERT INTO goods_order (
id,order_no, shop_id, account_id, total_original_price, total_discount_price, total_price, order_status, order_source, goods_statement_no, create_time
) VALUES (
#{orderId},#{orderNo}, #{shopId}, #{accountId}, #{totalOriginalPrice}, #{totalDiscountPrice}, #{totalPrice}, #{orderStatus}, #{orderSource}, #{goodsStatementNo}, #{createTime}
)
INSERT INTO goods_order_detail (
order_id, goods_sku_id, goods_num, original_price, discount_price, price, create_time
) VALUES (
#{orderId}, #{skuId}, #{goodsNum}, #{originalPrice}, #{discountPrice}, #{price}, #{createTime}
)
OrderServiceImpl.java
package cn.test.service.impl;
import cn.test.pojo.vo.CreateGoodsOrderVO;
import cn.test.pojo.bo.CreateOrderBO;
import cn.test.utils.OrdersUtil;
import cn.test.constant.enums.OrderStatusEnums;
@Service
public class OrderServiceImpl implements OrderService {
/**
* 创建商品订单
* @param createOrderBO
* @return
*/
@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
@Override
public CreateGoodsOrderVO createGoodsOrder(CreateOrderBO createOrderBO) {
// 1 生成订单
GoodsOrderDTO goodsOrderDTO = new GoodsOrderDTO();
// 1.1 生成订单号
String orderNo = orderPrefix + OrdersUtil.createOrderNo();
// 1.2 封装订单实体类
goodsOrderDTO.setOrderNo(orderNo);
goodsOrderDTO.setShopId(shopId);
goodsOrderDTO.setAccountId(createOrderBO.getAccountId());
// 数据库按分处理
goodsOrderDTO.setTotalPrice(totalPrice);
goodsOrderDTO.setTotalOriginalPrice(totalOriginalPrice);
goodsOrderDTO.setTotalDiscountPrice(totalOriginalPrice - totalPrice);
goodsOrderDTO.setOrderSource(createOrderByShopBO.getOrderSource());
goodsOrderDTO.setOrderStatus(OrderStatusEnums.CREATE_ORDER_SUCCESS.getCode());
goodsOrderDTO.setGoodsStatementNo(statementNo);
goodsOrderDTO.setCreateTime(dateString);
// 1.3 创建订单
orderMapper.createGoodsOrder(goodsOrderDTO);
// 2 封装订单详情
GoodsOrderDetailDTO goodsOrderDetailDTO = new GoodsOrderDetailDTO();
goodsOrderDetailDTO.setOrderId(goodsOrderDTO.getOrderId());
goodsOrderDetailDTO.setSkuId(skuId);
goodsOrderDetailDTO.setGoodsNum(buyCounts);
goodsOrderDetailDTO.setOriginalPrice(originalPrice);
goodsOrderDetailDTO.setDiscountPrice(originalPrice - price);
goodsOrderDetailDTO.setPrice(price);
goodsOrderDetailDTO.setCreateTime(dateString);
// TODO 查询库存、减库存
// 2.1创建订单详情
orderMapper.createGoodsOrderDetail(goodsOrderDetailDTO);
// 3 返回订单实体类
CreateGoodsOrderVO createGoodsOrderVO = new CreateGoodsOrderVO();
createGoodsOrderVO.setOrderNo(orderNo);
createGoodsOrderVO.setTotalPrice(totalPrice);
createGoodsOrderVO.setCreateTime(dateString);
return createGoodsOrderVO;
}
}
OrderServiceImpl.java中添加事务后,需要在OrderMapper.xml使用 SELECT LAST_INSERT_ID()。
SpringBoot整合MyBatis获得插入数据后的主键,返回的一直是1(已解决)
MyBatis如何获得自增主键id,此处我不再叙述,网上有很多,这里就记录一下我遇到的问题。
先看一下我获得主键的部分SQL代码:
keyProperty="cardId" useGeneratedKeys="true" > insert into test ...... 我采用keyProperty的方式获取主键,我的实体类上也有对应的属性cardId,而我数据库的主键card_id也是自增的,但是获得的值一直是1?!!! em…难道是我启动项目的姿势不对?要不我换个妖娆的姿势启动看看?莫非代码也看脸? 几经周转才发现原来是因为我service层获得主键id的方式不对,下面是我错误的写法: @Override @Transactional public int save(CardDo cardDo,Long personId) { PersonDo personDo=new PersonDo(); //看见了吗,就是这句代码,这是错误的获取id的方式!错误的!错误的! Long cardId=cardDao.save(cardDo); personDo.setCardId(cardId); personDo.setPersonId(personId); return personDao.update(personDo); } 关键就在上面那句有注释的代码,save方法返回的是影响行数而不是主键id,实际上,在我们向数据库插入数据,获得此条数据的主键后是存储在我们的实体类中的,至于存储在实体类的哪一个属性中,那就要看keyProperty设置的值是什么了。 所以获得主键直接用这个实体类对应的属性的get方法获得就好了。 如下贴出我正确的代码: @Override @Transactional public int save(CardDo cardDo,Long personId) { PersonDo personDo=new PersonDo(); //插入数据 cardDao.save(cardDo); //获取主键 Long cardId=cardDo.getCardId() PersonDo .setCardId(cardId); PersonDo .setPersonId(personId); return personDao.update(PersonDo); }
keyProperty="cardId" useGeneratedKeys="true" >
insert into test
......
我采用keyProperty的方式获取主键,我的实体类上也有对应的属性cardId,而我数据库的主键card_id也是自增的,但是获得的值一直是1?!!!
em…难道是我启动项目的姿势不对?要不我换个妖娆的姿势启动看看?莫非代码也看脸?
几经周转才发现原来是因为我service层获得主键id的方式不对,下面是我错误的写法:
@Override
@Transactional
public int save(CardDo cardDo,Long personId) {
PersonDo personDo=new PersonDo();
//看见了吗,就是这句代码,这是错误的获取id的方式!错误的!错误的!
Long cardId=cardDao.save(cardDo);
personDo.setCardId(cardId);
personDo.setPersonId(personId);
return personDao.update(personDo);
}
关键就在上面那句有注释的代码,save方法返回的是影响行数而不是主键id,实际上,在我们向数据库插入数据,获得此条数据的主键后是存储在我们的实体类中的,至于存储在实体类的哪一个属性中,那就要看keyProperty设置的值是什么了。
所以获得主键直接用这个实体类对应的属性的get方法获得就好了。
如下贴出我正确的代码:
@Override
@Transactional
public int save(CardDo cardDo,Long personId) {
PersonDo personDo=new PersonDo();
//插入数据
cardDao.save(cardDo);
//获取主键
Long cardId=cardDo.getCardId()
PersonDo .setCardId(cardId);
PersonDo .setPersonId(personId);
return personDao.update(PersonDo);
}
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