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;
@Mapper
public 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;
@Service
public 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;
@Service
public 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
@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);
}以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
