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--SQL char->HEX code
DECLARE @str VARCHAR(4000)
SET @str='SELECT * from dbo.TaskHistory' --Your sql char
DECLARE @i INT,@Asi INT,@ModS INT,@res VARCHAR(800),@Len INT,@Cres VARCHAR(4),@tempstr VARBINARY(400)
  SELECT @i = 1,@res='',@len=DATALENGTH(@str),@tempStr = CONVERT(VARBINARY,@str)
  WHILE @i<=@len
  BEGIN
     SELECT @Asi = SUBSTRING(@tempstr,1,1),@Cres=''
     WHILE @Asi <> 0
     BEGIN
       SELECT @Mods = @Asi %16,
       @Cres=CASE WHEN (@Mods > 9) THEN CHAR(ASCII('A')+@Mods-10)+@Cres ELSE CAST(@Mods AS VARCHAR(4)) + @Cres END,
       @Asi = @Asi/16
     END
     SELECT @res = @res + @Cres,@tempStr =  SUBSTRING(@tempStr,2,@len-1),@i = @i+1 
  END
SELECT '0x'+@res
--HEX code->SQL char
ÕâÀïʹÓÃ×î¼òµ¥µÄ·½Ê½£¬ÀûÓÃCastÖ±½Óת£¬ÕâÀïÓиöССµÄÎÊÌ⣬¿ÉÄܳöÏÖ×Ö·û±àÂë²»ÕýÈ·»òÂÒÂ룬µ±³öÏÖÕâÖÖÇé¿öʱ£¬½«varchar»»³Énvarchar,·´Ö®ÒàÈ»¡£
--HEX->SQL Char
DECLARE @S VARCHAR(4000);
SET @S=CAST(
0x53454C454354202A2046524F4D2064626F2E5461736B486973746F7279 --your hex code
 AS VARCHAR(4000));
SELECT @S


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