解決Spring或SpringBoot開啟事務以後無法返回自增主鍵的問題

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Spring或SpringBoot開啟事務以後無法返回自增主鍵

場景：保存訂單和訂單詳情，訂單詳情需要訂單id，數據庫中的訂單表是自增主鍵，開啟事務後，導致訂單主鍵無法返回

1、開啟事務前（以下代碼隻是樣例，實際可能無法運行）

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" >
  <!-- 創建商品訂單 -->
  <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>
  <!-- 創建商品訂單詳情 -->
  <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;
@Mapper
public interface OrderMapper {
    /**
     * 創建商品訂單
     *
     * @param goodsOrderDTO
     * @return
     */
    void createGoodsOrder(GoodsOrderDTO goodsOrderDTO);
    /**
     * 創建商品訂單詳情
     *
     * @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 {
    /**
     * 創建商品訂單
    * @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 {
   /**
    * 創建商品訂單
    * @param createOrderBO
    * @return
    */
   @Override
   public CreateGoodsOrderVO createGoodsOrder(CreateOrderBO createOrderBO) {
       // 1 生成訂單
       GoodsOrderDTO goodsOrderDTO = new GoodsOrderDTO();
       // 1.1 生成訂單號
       String orderNo = orderPrefix + OrdersUtil.createOrderNo();
       // 1.2 封裝訂單實體類
       goodsOrderDTO.setOrderNo(orderNo);
       goodsOrderDTO.setShopId(shopId);
       goodsOrderDTO.setAccountId(createOrderBO.getAccountId());
       // 數據庫按分處理
       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 創建訂單
       orderMapper.createGoodsOrder(goodsOrderDTO);
       
       // 2 封裝訂單詳情
       GoodsOrderDetailDTO goodsOrderDetailDTO = new GoodsOrderDetailDTO();
       goodsOrderDetailDTO.setOrderId(goodsOrderDTO.getOrderId());　　//不開啟事務可以獲取到訂單自增主鍵
       goodsOrderDetailDTO.setSkuId(skuId);
       goodsOrderDetailDTO.setGoodsNum(buyCounts);
       goodsOrderDetailDTO.setOriginalPrice(originalPrice);
       goodsOrderDetailDTO.setDiscountPrice(originalPrice - price);
       goodsOrderDetailDTO.setPrice(price);
       goodsOrderDetailDTO.setCreateTime(dateString);
       // TODO  查詢庫存、減庫存
       // 2.1創建訂單詳情
       orderMapper.createGoodsOrderDetail(goodsOrderDetailDTO);
       
       // 3 返回訂單實體類
       CreateGoodsOrderVO createGoodsOrderVO = new CreateGoodsOrderVO();
       createGoodsOrderVO.setOrderNo(orderNo);
       createGoodsOrderVO.setTotalPrice(totalPrice);
       createGoodsOrderVO.setCreateTime(dateString);
       return createGoodsOrderVO;
   }
}

2、開啟事務後（隻修改瞭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" > 
 
   <!-- 創建商品訂單 -->
   <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>
  
  <!-- 創建商品訂單詳情 -->
  <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;
@Service
public class OrderServiceImpl implements OrderService {
    /**
     * 創建商品訂單
     * @param createOrderBO
     * @return
     */
    @Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class)
    @Override
    public CreateGoodsOrderVO createGoodsOrder(CreateOrderBO createOrderBO) {
        // 1 生成訂單
        GoodsOrderDTO goodsOrderDTO = new GoodsOrderDTO();
        // 1.1 生成訂單號
        String orderNo = orderPrefix + OrdersUtil.createOrderNo();
        // 1.2 封裝訂單實體類
        goodsOrderDTO.setOrderNo(orderNo);
        goodsOrderDTO.setShopId(shopId);
        goodsOrderDTO.setAccountId(createOrderBO.getAccountId());
        // 數據庫按分處理
        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 創建訂單
        orderMapper.createGoodsOrder(goodsOrderDTO);
        
        // 2 封裝訂單詳情
        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  查詢庫存、減庫存
        // 2.1創建訂單詳情
        orderMapper.createGoodsOrderDetail(goodsOrderDetailDTO);
        
        // 3 返回訂單實體類
        CreateGoodsOrderVO createGoodsOrderVO = new CreateGoodsOrderVO();
        createGoodsOrderVO.setOrderNo(orderNo);
        createGoodsOrderVO.setTotalPrice(totalPrice);
        createGoodsOrderVO.setCreateTime(dateString);
        return createGoodsOrderVO;
    }    
}

OrderServiceImpl.java中添加事務後，需要在OrderMapper.xml使用 SELECT LAST_INSERT_ID()。

SpringBoot整合MyBatis獲得插入數據後的主鍵，返回的一直是1(已解決)

MyBatis如何獲得自增主鍵id，此處我不再敘述，網上有很多，這裡就記錄一下我遇到的問題。

先看一下我獲得主鍵的部分SQL代碼：

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

我采用keyProperty的方式獲取主鍵，我的實體類上也有對應的屬性cardId，而我數據庫的主鍵card_id也是自增的，但是獲得的值一直是1？！！！

em…難道是我啟動項目的姿勢不對？要不我換個妖嬈的姿勢啟動看看？莫非代碼也看臉？

幾經周轉才發現原來是因為我service層獲得主鍵id的方式不對，下面是我錯誤的寫法：

@Override
@Transactional
public int save(CardDo cardDo,Long personId) {
        PersonDo personDo=new PersonDo();
        
        //看見瞭嗎，就是這句代碼，這是錯誤的獲取id的方式！錯誤的！錯誤的！
        Long cardId=cardDao.save(cardDo);
        
        personDo.setCardId(cardId);
        personDo.setPersonId(personId);
        return personDao.update(personDo);
}

關鍵就在上面那句有註釋的代碼，save方法返回的是影響行數而不是主鍵id，實際上，在我們向數據庫插入數據，獲得此條數據的主鍵後是存儲在我們的實體類中的，至於存儲在實體類的哪一個屬性中，那就要看keyProperty設置的值是什麼瞭。

所以獲得主鍵直接用這個實體類對應的屬性的get方法獲得就好瞭。

如下貼出我正確的代碼：

@Override
@Transactional
public int save(CardDo cardDo,Long personId) {
        PersonDo personDo=new PersonDo();
        //插入數據
        cardDao.save(cardDo);
        
        //獲取主鍵
        Long cardId=cardDo.getCardId()
        
        PersonDo .setCardId(cardId);
        PersonDo .setPersonId(personId);
        return personDao.update(PersonDo);
}

以上為個人經驗，希望能給大傢一個參考，也希望大傢多多支持WalkonNet。

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