1.代客下单会员余额支付

src/main/java/com/chaozhanggui/system/cashierservice/mybatis/MpShopUserFlowMapper.java

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+package com.chaozhanggui.system.cashierservice.mybatis;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.chaozhanggui.system.cashierservice.entity.TbShopUserFlow;
+
+public interface MpShopUserFlowMapper extends BaseMapper<TbShopUserFlow> {
+}

src/main/java/com/chaozhanggui/system/cashierservice/mybatis/MpShopUserMapper.java

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+package com.chaozhanggui.system.cashierservice.mybatis;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.chaozhanggui.system.cashierservice.entity.TbShopUser;
+import org.apache.ibatis.annotations.Param;
+import org.apache.ibatis.annotations.Update;
+
+import java.math.BigDecimal;
+
+public interface MpShopUserMapper extends BaseMapper<TbShopUser> {
+    @Update("update tb_shop_user set amount=amount-#{orderAmount}, consume_amount=consume_amount+#{orderAmount} where id=#{vipUserId} and amount >= 0")
+    long decrBalance(@Param("vipUserId") Integer vipUserId, @Param("orderAmount") BigDecimal orderAmount);
+}