[交流貼]教你怎樣實現SQL密文加密，不可反編譯,该怎么处理

use Tempdbgoif object_ID('fn_ACITEncryption') is not null    drop function fn_ACITEncryptiongocreate function fn_ACITEncryption(    @Str nvarchar(4000),--加密的字符串    @Flag bit=1,--1、加密 0、解密    @Key nvarchar(50)--密文)returns nvarchar(4000)--這里可轉換成二進制with EncryptionasbeginDeclare @LenStr int,@i int,@Str2 nvarchar(4000),@Split nvarchar(2),@LenKey intselect @Str=@Str+'A',@LenStr=len(@Str),@i=1,@Str2='',@LenKey=Len(@Key+'A')-1while @i<@LenStr        select    @Split=substring(@Str,@i,1),                @Split=nchar((unicode(@Split)+case @Flag    when 1 then unicode(substring(@Key+'A',@i%@LenKey+1,1))-1                                                                                                    when 0 then 65535-unicode(substring(@Key+'A',@i%@LenKey+1,1))                                                    else 0 end)%65535+cast(@Flag as int)),                @Str2=@Str2+@Split,@i=@i+1return @Str2endgoselect dbo.fn_ACITEncryption(N'Roy',1,'123') as 加密后字符串/*加密后字符串------------------------------?¢ª(1 個資料列受到影響)*/select dbo.fn_ACITEncryption(N'?¢ª',0,'123') as 解密后字符串/*解密后字符串--------------------------Roy(1 個資料列受到影響)*/