SQL 进制间如何转换

--10进制转16进制
create function inttohex(@int10 int)
returns varchar(8)
begin
    declare @int10 int
    declare @str16 nvarchar(8)
    set @str16=''

    if(@int10>0)
    begin
        while @int10>0
        begin
            set @str16=substring('0123456789ABCDEF',@int10%16+1,1)+@str16
            set @int10=@int10/16
        end
    end
        else
        begin
            set @str16='0'
        end
    return @str16
end


--16进制转10进制
create function hextoint(@str16 varchar(8)) 
returns int 
begin 

    declare @int10 int 
    declare @i int     
    set @int10=0 
    set @i=1 

    while @i<=len(@str16) 
    begin 
        set @int10=@int10+
            convert(int,
                (case   when substring(@str16,@i,1)<='9' then substring(@str16,@i,1)
                    when substring(@str16,@i,1)<='A' then '10'
                    when substring(@str16,@i,1)<='B' then '11'
                    when substring(@str16,@i,1)<='C' then '12'
                    when substring(@str16,@i,1)<='D' then '13'
                    when substring(@str16,@i,1)<='E' then '14'
                    when substring(@str16,@i,1)<='F' then '15' end )) * power(16,len(@str16)-@i) 
        set @i=@i+1
    end
    return @int10 
end


CREATE FUNCTION hextoint(@s varchar(16))
RETURNS bigint
AS
BEGIN
--作者：pbsql
--参数不得含'0'～'9'、'a'～'f'、'A'～'F'之外的任意字符（首尾空格除外），否则返回0
  DECLARE @i int,@result bigint
  SELECT @i=0,@result=0,@s=RTRIM(LTRIM(UPPER(REVERSE(@s))))
  WHILE @i<LEN(@s)
  BEGIN
    IF SUBSTRING(@s,@i 1,1) not between '0' and '9' and SUBSTRING(@s,@i 1,1) not between 'A' and 'F'
    BEGIN
      SELECT @result=0
      break
    END
    SELECT @result=@result (CHARINDEX(SUBSTRING(@s,@i 1,1),'0123456789ABCDEF')-1)*POWER(16,@i),@i=@i 1
  END
  RETURN @result
END
GO


--10进制转2进制
create function f_int2bin(@i int)
returns varchar(1000)
as
begin
    declare @s varchar(1000)
    set @s=''
    while @i>0
        select @s=cast(@i%2 as varchar) @s
            ,@i=@i/2
    return(@s)
end
go


--16进制字符转为2进制字符串
CREATE FUNCTION hextobinary(@str CHAR(1))
RETURNS VARCHAR(4)
AS
BEGIN
    DECLARE @var VARCHAR(4)
    SET @var=CASE
        WHEN @str='0' THEN '0000'
        WHEN @str='1' THEN '0001'
        WHEN @str='2' THEN '0010'
        WHEN @str='3' THEN '0011'
        WHEN @str='4' THEN '0100'
        WHEN @str='5' THEN '0101'
        WHEN @str='6' THEN '0110'
        WHEN @str='7' THEN '0111'
        WHEN @str='8' THEN '1000'
        WHEN @str='9' THEN '1001'
        WHEN @str='A' THEN '1010'
        WHEN @str='B' THEN '1011'
        WHEN @str='C' THEN '1100'
        WHEN @str='D' THEN '1101'
        WHEN @str='E' THEN '1110'
        WHEN @str='F' THEN '1111'
    END
    RETURN @var    
END 


--16进制字符串转为2进制字符串
DECLARE @str VARCHAR(50)
DECLARE @res VARCHAR(500)
DECLARE @i INT
SET @i=1
SET @str='80'
SET @res=''
WHILE @i，3
BEGIN
    SET @res=@res+dbo.hextobinary(substring(@str,@i,1))
    SET @i=@i+1
END 
PRINT @res



--10进制转为16进制
DECLARE 
@binary varbinary(255), 
@str_return varchar(255) 

SELECT 
@binary = CONVERT(varbinary(255),29327795562177529) 

EXEC master.dbo.xp_varbintohexstr @binary, @str_return OUTPUT 
SELECT 
结果 = reverse(@str_return)