SQL版IP转换成整数

CREATE FUNCTION f_IP2Int

(

    @ip CHAR(15)

)

RETURNS BIGINT

AS

BEGIN

    DECLARE @re BIGINT   

    SET @re = 0   

    SELECT @re = @re+LEFT(@ip, CHARINDEX('.', @ip+'.')-1)*ID, @ip = STUFF(@ip, 1, CHARINDEX('.', @ip+'.'), '') 

    FROM (

             SELECT ID = CAST(16777216 AS BIGINT) 

             UNION ALL   SELECT 65536 

             UNION ALL   SELECT 256 

             UNION ALL   SELECT 1

         )A 

    RETURN(@re)

END

GO 

/*--调用示例  
    
  select dbo.f_IP2Int('255.255.255.255')   
  select dbo.f_IP2Int('12.168.0.1')   
--*/