我如何可以驗證字符串是否包含特定字符範圍

Question

這裏是我的功能基轉換的輸入值基數，輸入基地，基地轉換

的代碼：

Create Function dbo.Unit_Base_To_Base(@Input as nvarchar(60),@Base as int, @NewBase as int) 
Returns nvarchar(450) 
as begin 
Declare @Chartable table(Value int,Char nvarchar(100)) 
Declare @list Table(val bigint) 
DECLARE @I bigint = 1, 
@Formula bigint, 
@I2 bigint=1, 
@Formula2 varchar(100) 
Declare @Ilength bigint = (cast(len(@Input) as nvarchar(60))) 
Declare @I2length2 bigint 
--------------Value Table 
Insert into @Chartable(Value,char) 
Values(0,'0') 
, (1,'1') 
, (2,'2') 
, (3,'3') 
, (4,'4') 
, (5,'5') 
, (6,'6') 
, (7,'7') 
, (8,'8') 
, (9,'9') 
, (10,'A') 
, (11,'B') 
, (12,'C') 
, (13,'D') 
, (14,'E') 
, (15,'F') 
, (16,'G') 
, (17,'H') 
, (18,'I') 
, (19,'J') 
, (20,'K') 
, (21,'L') 
, (22,'M') 
, (23,'N') 
, (24,'O') 
, (25,'P') 
, (26,'Q') 
, (27,'R') 
, (28,'S') 
, (29,'T') 
, (30,'U') 
, (31,'V') 
, (32,'W') 
, (33,'X') 
, (34,'Y') 
, (35,'Z') 

------------Convertion Start to 10 


SET @Formula = ((Power(convert(bigint,@Base) , (@Ilength-1)))*(Cast((select Value from @Chartable where char=(SUBSTRING(@input,1,1))) as bigint))) 
WHILE @I <= (cast(@Ilength as bigint)) 
BEGIN 
insert into @list(val) 
values(@Formula) 
    SET @I = @I + 1 
    SET @Formula = (cast((Power(convert(bigint,@Base) , (@Ilength-@I)))*(Cast((select value from @Chartable where char =(SUBSTRING(@input,@I,1))) as bigint))as bigint)) 
END 

------------Convertion Start to base 
Declare @I2nput2 as nvarchar(60) = (select sum(val) from @list) 
If @newbase<10 begin set @I2length2 = LOG(@I2nput2,@newbase)+1 end else begin set @I2length2 = (cast(len(@I2nput2) as bigint)) end 
SET @Formula2 = (select char from @Chartable where value=(cast(((CAST(@I2nput2 as bigint))-(((CAST(@I2nput2 as bigint))/(Power(convert(bigint,@newbase) , (@I2length2+1)))))*(Power(convert(bigint,@newbase) , (@I2length2))))/(Power(convert(bigint,@newbase) , (@I2length2-1))) as nvarchar(450)))) 
WHILE @I2 <= (cast(@I2length2 as bigint)) 
BEGIN 

    SET @I2 = @I2 + 1 
    SET @Formula2 = @Formula2 + (select char from @Chartable where value=(cast(Cast(Isnull(((CAST(@I2nput2 as bigint))-(((CAST(@I2nput2 as bigint))/(Power(convert(bigint,@newbase) , (@I2length2-@I2+1)))))*(Power(convert(bigint,@newbase) , (@I2length2-@I2+1))))/ (isnull(Nullif(Power(convert(bigint,@newbase) , (@I2length2-@I2)),0),1)) ,'') as varchar(100)) as nvarchar(450)))) 
END 
Declare @Result nvarchar(100) =(select replace(ltrim(replace(Left(@Formula2,Len(@Formula2)-1),'0',' ')),' ','0')) 
Return @Result 
End 

---

現在，如果我跑

select dbo.Unit_Base_To_Base('101',2, 10) 

然後返回5這是確定以一個有效基部2輸入值

而且

select dbo.Unit_Base_To_Base('FFF',2, 10) 

---

然後返回105，其是用於無效基座2輸入值結果

我需要確保輸入值對基值有效否則返回錯誤結果

Thanks in Advance 

Answer 1

有趣的問題。你可以分解你輸入的字符串，並把它放在循環中檢查它是否大於允許的「max char」。你可以通過使用char（x）函數來獲得。

http://technet.microsoft.com/pt-br/library/ms187323.aspx

下面一些pseudcode（C＃樣式）

function validinputstring(stringInput, base) 
{ 
    foreach charX in stringInput 
    { 
     is charX > char(base+offset) 
    } 
} 

該偏移裝置： '1'= CHAR（2 +偏移）& & 'F'= CHAR（16 +偏移）等