增加可用优惠券数量

src/main/resources/mapper/TbUserCouponsMapper.xml

@@ -30,7 +30,10 @@
   <select id="selectByOrderId" resultType="com.chaozhanggui.system.cashierservice.entity.TbUserCoupons">
     select * from tb_user_coupons where order_id = #{orderId}
   </select>
-  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
+    <select id="selectByUserIdAndAmount" resultType="java.lang.Integer">
+      select ifnull(count(*),0) from tb_user_coupons where user_id = #{userId} and status = '0' and coupons_amount >= #{orderNum}
+    </select>
+    <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
     delete from tb_user_coupons
     where id = #{id,jdbcType=INTEGER}
   </delete>