tsql - 转换Varchar成Ascii

Question

我正在尝试将VARCHAR字段的内容转换为可以被第三方轻松引用的唯一数字。

如何将varchar转换为等效的ascii字符串？在TSQL中？ ASCII()函数可转换单个字符，但如何转换整个字符串呢？

我试过使用

CAST(ISNULL(ASCII(Substring(RTRIM(LTRIM(PrimaryContactRegion)),1,1)),'')AS VARCHAR(3))
+ CAST(ISNULL(ASCII(Substring(RTRIM(LTRIM(PrimaryContactRegion)),2,1)),'')AS VARCHAR(3))

....但是这看起来很乏味，愚蠢，而且如果我的弦长了，那实际上是行不通的。或者，如果更好，我将如何在SSRS中做同样的事情？

Answer 1

尝试这样的事情:

DECLARE @YourString   varchar(500)

SELECT @YourString='Hello World!'

;WITH AllNumbers AS
(
    SELECT 1 AS Number
    UNION ALL
    SELECT Number+1
        FROM AllNumbers
        WHERE Number<LEN(@YourString)
)
SELECT
       (SELECT
            ASCII(SUBSTRING(@YourString,Number,1))
            FROM AllNumbers
            ORDER BY Number
            FOR XML PATH(''), TYPE
       ).value('.','varchar(max)') AS NewValue
       --OPTION (MAXRECURSION 500) --<<needed if you have a string longer than 100

输出:

NewValue
---------------------------------------
72101108108111328711111410810033

(1 row(s) affected)

只是测试一下:

;WITH AllNumbers AS
(
    SELECT 1 AS Number
    UNION ALL
    SELECT Number+1
        FROM AllNumbers
        WHERE Number<LEN(@YourString)
)
SELECT SUBSTRING(@YourString,Number,1),ASCII(SUBSTRING(@YourString,Number,1)),* FROM AllNumbers

输出:

                 Number
---- ----------- -----------
H    72          1
e    101         2
l    108         3
l    108         4
o    111         5
     32          6
W    87          7
o    111         8
r    114         9
l    108         10
d    100         11
!    33          12

(12 row(s) affected)

另外，您可能要使用此命令:

RIGHT('000'+CONVERT(varchar(max),ASCII(SUBSTRING(@YourString,Number,1))),3)

强制将所有ASCII值转换为3位数字，根据您的使用情况，我不确定是否有必要这样做。

每个字符使用3位数字输出:

NewValue
-------------------------------------
072101108108111032087111114108100033

(1 row(s) affected)