IP Char to Int

最新推荐文章于 2021-05-20 03:43:21 发布

sho_ko

最新推荐文章于 2021-05-20 03:43:21 发布

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本文介绍了一个SQL Server用户定义函数ipStringToBigInt，该函数将IPv4地址字符串转换为bigint整数，以便于存储和查询。通过解析IPv4地址的四个部分并计算其对应的bigint值，实现IP地址的有效管理。

USE [UILogDB]
GO
/****** Object:  UserDefinedFunction [dbo].[ipStringToBigInt]    Script Date: 11/09/2011 09:47:30 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER FUNCTION [dbo].[ipStringToBigInt] ( @ip CHAR(15) ) 
RETURNS bigint 
AS 
BEGIN 
	DECLARE @rv bigint, @o1 bigint, @o2 INT, @o3 INT, @o4 INT 
	if (isnumeric(replace(@ip,'.',''))<>0)
	begin
		SELECT @o1 = CONVERT(INT, PARSENAME(@ip, 4)), @o2 = CONVERT(INT, PARSENAME(@ip, 3)), @o3 = CONVERT(INT, PARSENAME(@ip, 2)), @o4 = CONVERT(INT, PARSENAME(@ip, 1)) 
		IF (@o1 BETWEEN 0 AND 255) AND (@o2 BETWEEN 0 AND 255) AND (@o3 BETWEEN 0 AND 255) AND (@o4 BETWEEN 0 AND 255) 
		BEGIN 
		SET @rv = (@o1 * 16777216) + (@o2 * 65536) + (@o3 * 256) + (@o4) 
		END 
		ELSE 
		SET @rv = 0 RETURN @rv
		end
	else  
		SET @rv = 0 RETURN @rv
END