Question

我有存储程序以生成优惠券代码，其中我通过了优惠券代码的前缀

CREATE PROCEDURE [dbo].[spCouponCode1] 
        @Prefix varchar(50),
        @Lenght varchar(50)
    AS
    Begin
    declare @maxID as bigint=0
    declare @PrefixLenght as bigint=0
        set @PrefixLenght=LEN(@Prefix)
    select @maxID = isnull(max(substring(CouponCode,@PrefixLenght+1,@PrefixLenght+1+@Lenght)),0) + 1 from Coupon where CouponCode Like @Prefix + '%'
    select @Prefix + cast(@maxID as VARchar(100))
    end

它完美无缺问题是如果在优惠券表中有优惠券代码，如'FIRST0001'和'FIRSTNEW001' 这里我得到错误 - varchar到int转换失败，因为我试图解析'NEW001'到int找到最大值是否可以将此'NEW001'解析为int忽略起始字符

Answer 1

Sql Server尝试：

select @maxID = isnull(max(substring(CouponCode, patindex('%[0-9]%', CouponCode), len(CouponCode))),0) + 1 
from Coupon where CouponCode Like @Prefix + '%'

生成优惠券代码时出现问题

1 个答案: