更改字符但保留长度

我正在将敏感数据迁移到数据库，并且我需要隐藏文本的详细信息。我们希望保持文本的大小和长度，但改变意义。更改字符但保留长度

例如：

“詹姆斯受到好评，并应得到帮助的时候，他老是觉得很难讲”

应更改为：

“jhdfy DFW aslk DFE kjdfkjd， kjf kjdsf df iotryy erhr lsdj jf ytwe it kjdf tr kjsdd“

是否有更新所有行的方法，将列文本设置为此随机类型文本？真的只想改变字符（a-z，A-Z），并保持其余。

来源

2016-02-29 Craig

一种选择是使用一堆嵌套替换。。。但是这可能会影响嵌套函数的最大数量。

你可以写使用outer apply一个痛苦的查询：

select 
from t outer apply 
    (select replace(t.col, 'a', 'z') as col1) outer apply 
    (select replace(col1, 'b', 'y')) outer apply 
    . . .

但是，您可能需要编写自己的功能。在其他数据库中，这称为translate()（在Unix命令之后）。如果你的谷歌SQL Server translate，我想你会在网上找到例子。

来源

2016-02-29 01:38:58

一种方法是split the string character by character并用随机字符串替换每一行。然后将它们连接起来回以获得所需的输出

DECLARE @str VARCHAR(MAX) = 'James has been well received, and should be helped when ever he finds it hard to speak' 

;WITH Cte(orig, random) AS(
SELECT 
    SUBSTRING(t.a, v.number + 1, 1), 
    CASE 
     WHEN SUBSTRING(t.a, v.number + 1, 1) LIKE '[a-z]' 
      THEN CHAR(ABS(CHECKSUM(NEWID())) % 25 + 97) 
     ELSE SUBSTRING(t.a, v.number + 1, 1) 
    END 
FROM (SELECT @str) t(a) 
CROSS JOIN master..spt_values v 
WHERE 
    v.number < LEN(t.a) 
    AND v.type = 'P' 
) 
SELECT 
    OrignalString = @str, 
    RandomString = (
     SELECT '' + random 
     FROM Cte FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)' 
    )

TRY IT HERE

来源

2016-02-29 01:54:07

行这是可能的使用用户定义的函数（UDF）和的示图。 SQL Server不允许在UDF中生成随机数，但在视图中允许它。参考文献：http://blog.sqlauthority.com/2012/11/20/sql-server-using-rand-in-user-defined-functions-udf/

所以这里是解决

CREATE VIEW [dbo].[rndView] 
AS 
    SELECT RAND() rndResult 

GO 
CREATE FUNCTION [dbo].[RandFn]() 
    RETURNS float 
AS 
BEGIN 
    DECLARE @rndValue float 
    SELECT @rndValue = rndResult 
    FROM rndView 
    RETURN @rndValue 
END 

GO 

CREATE FUNCTION [dbo].[randomstring] (@stringToParse VARCHAR(MAX)) 
RETURNS 
    varchar(max) 
AS 
BEGIN 
/* 
A = 65 
Z = 90 

a = 97 
z = 112 
declare @stringToParse VARCHAR(MAX) = 'James has been well received, and should be helped when ever he finds it hard to speak' 
Select [dbo].[randomstring] (@stringToParse) 
go 
Update SpecialTable 
Set SpecialString = [dbo].[randomstring] (SpecialString) 
go 

*/ 
    declare @StringToreturn varchar(max) = '' 
    declare @charCounter int = 1 
    declare @len int = len(@stringToParse) 
    declare @thisRand int 
    declare @UpperA int = 65 
    declare @UpperZ int = 90 

    declare @LowerA int = 97 
    declare @LowerZ int = 112 
    declare @thisChar char(1) 
    declare @Random_Number float 
    declare @randomChar char(1) 
    WHILE @charCounter < @len 
    BEGIN 
     SELECT @thisChar = SUBSTRING(@stringToParse, @charCounter, 1) 
     set @randomChar = @thisChar 
     --print @randomChar 
     SELECT @Random_Number = dbo.RandFn() 
     --print @Random_Number 
     --only swap if a-z or A-Z 
     if ASCII(@thisChar) >= @UpperA and ASCII(@thisChar) <= @UpperZ begin 
     --upper case 

      set @thisRand = @UpperA + (@Random_Number * convert(float, (@[email protected]))) 
      set @randomChar = CHAR(@thisRand) 
      --print @thisRand 
     end 
     if ASCII(@thisChar) >= @LowerA and ASCII(@thisChar) <= @LowerZ begin 
     --upper case 
      set @thisRand = @LowerA + (@Random_Number * convert(float, (@[email protected]))) 
      set @randomChar = CHAR(@thisRand) 
     end 
     --print @thisRand 

     --print @randomChar 
     set @StringToreturn = @StringToreturn + @randomChar   
     SET @charCounter = @charCounter + 1 
    END 

    --Select * from @returnList 
    return @StringToreturn 
END 



GO

来源

2016-02-29 02:23:04 cameront

更改字符但保留长度

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