如何解决Spring或SpringBoot开启事务以后无法返回自增主键的问题

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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

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "Http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="cn.test.mapper.OrderMapper" >  <!-- 创建商品订单 -->  <insert id="createGoodsOrder" parameterType="cn.test.pojo.dto.GoodsOrderDTO" useGeneratedKeys="true" keyProperty="orderId">    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>  <!-- 创建商品订单详情 -->  <insert id="createGoodsOrderDetail" parameterType="cn.test.pojo.dto.GoodsOrderDetailDTO" >    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}    )  </insert></mapper>

OrderMapper.java

package cn.test.mapper;import cn.test.pojo.dto.GoodsOrderDTO;import cn.test.pojo.dto.GoodsOrderDetailDTO;import org.apache.ibatis.annotations.Mapper;@Mapperpublic interface OrderMapper {        void createGoodsOrder(GoodsOrderDTO goodsOrderDTO);        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 {       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;@Servicepublic class OrderServiceImpl implements OrderService {      @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、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

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="cn.test.mapper.OrderMapper" >     <!-- 创建商品订单 -->   <insert id="createGoodsOrder" parameterType="cn.test.pojo.dto.GoodsOrderDTO" >     <selecTKEy resultType="java.lang.Integer" keyProperty="orderId">      SELECT LAST_INSERT_ID()    </selectKey>    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>    <!-- 创建商品订单详情 -->  <insert id="createGoodsOrderDetail" parameterType="cn.test.pojo.dto.GoodsOrderDetailDTO" >    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}    )  </insert></mapper>

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;@Servicepublic class OrderServiceImpl implements OrderService {        @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：

<insert id="save" parameterType="com.test.domain.CardDo"     keyProperty="cardId" useGeneratedKeys="true" >                  insert into test         <trim prefix="(" suffix=")" suffixOverrides=",">         ......

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@Transactionalpublic 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@Transactionalpublic 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);}

感谢各位的阅读，以上就是“如何解决Spring或SpringBoot开启事务以后无法返回自增主键的问题”的内容了，经过本文的学习后，相信大家对如何解决Spring或SpringBoot开启事务以后无法返回自增主键的问题这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是编程网，小编将为大家推送更多相关知识点的文章，欢迎关注！