Need to move some code from MySql to TSql. I have a couple of calls to INET_ATON which converts a string which resembles an IPAddress into a number. Is there a T-SQL equivalent?
+4
A:
An abuse of the parsname function:
create function INET_ATON (@addr varchar(15))
returns bigint
with schemabinding
as
begin
return
cast(parsename(@addr, 4) as bigint) * 16777216 +
cast(parsename(@addr, 3) as bigint) * 65536 +
cast(parsename(@addr, 2) as bigint) * 256 +
cast(parsename(@addr, 1) as bigint)
end
That "short form address" thing is not supported here though.
GSerg
2009-03-29 23:48:35
+2
A:
Here's a function to convert an IP address to a string:
CREATE FUNCTION dbo.IpToString
(@ip_str VarChar(15))
returns BigInt
as
begin
declare @i int
declare @dot_pos int
declare @current_part VarChar(15)
declare @result BigInt
set @result = 0
set @i = 0
while Len(@ip_str) > 0
begin
set @i = @i + 1
set @dot_pos = CharIndex('.', @ip_str)
if @dot_pos > 0
begin
set @current_part = Left(@ip_str, @dot_pos - 1)
set @ip_str = SubString(@ip_str, @dot_pos + 1, 15)
end
else
begin
set @current_part = @ip_str
set @ip_str = ''
end
if Len(@current_part) > 3 Return(Null)
if IsNumeric(@current_part) = 0 Return (Null)
if not cast(@current_part as int) between 0 and 255 Return (Null)
set @result = 256 * @result + Cast(@current_part as BigInt)
end
if @i = 4 Return(@result)
Return(Null)
end
After creating the function, you can call it like:
select dbo.IpToString('1.2.3.4')
Andomar
2009-03-30 07:31:10
+1
A:
Little better. It uses int (4b) instead of bigint (8b). Your result should only be four bytes... one per octet:
create function INET_ATON (@ip varchar(15))
returns int
begin
declare @rslt int
-- This first part is a little error checking
-- Looks for three dots and all numbers when not dots
if len(@ip) - len(replace(@ip,'.','')) = 3
AND
isnumeric(replace(@ip,'.','')) = 1
begin
set @rslt = convert(int,
convert(binary(1),convert(tinyint,parsename(@ip, 4)))
+ convert(binary(1),convert(tinyint,parsename(@ip, 3)))
+ convert(binary(1),convert(tinyint,parsename(@ip, 2)))
+ convert(binary(1),convert(tinyint,parsename(@ip, 1)))
)
end
else set @rslt = 0
return @rslt
end;