如何将作为字符串保存的IP地址变为二进制数值？

　　对于SQL Server 2000，你可以使用下列函数:CREATE FUNCTION dbo.IPAddrStr2Bin(@strIP varchar(15), @Validate bit = 1) RETURNS binary(4)ASBEGINIF @Validate = 1BEGIN-- only digits and dotsIF @strIP LIKE '%[^.0-9]%' RETURN (NULL) -- number of dots must be 3 IF LEN(@strIP) - LEN(REPLACE(@strIP, '.', '')) != 3 RETURN (NULL) -- all octets must be specified IF @strIP NOT LIKE '%_%.%_%.%_%.%_%' RETURN (NULL) END DECLARE @oct1 binary(1), @oct2 binary(1), @oct3 binary(1), @oct4 binary(1) SET @oct1 = CAST(CAST(LEFT(@strIP, CHARINDEX('.', @strIP) - 1) AS int) AS binary(1)) SET @oct2 = CAST(CAST(SUBSTRING(@strIP, CHARINDEX('.', @strIP) 1, CHARINDEX('.', @strIP, CHARINDEX('.', @strIP) 1) - CHARINDEX('.', @strIP) - 1) AS int) AS binary(1)) SET @oct3 = CAST(CAST(SUBSTRING(@strIP, CHARINDEX('.', @strIP, CHARINDEX('.', @strIP) 1) 1, (LEN(@strIP) - CHARINDEX('.', REVERSE(@strIP)) 1) - (CHARINDEX('.', @strIP, CHARINDEX('.', @strIP) 1)) - 1) AS int) AS binary(1)) SET @oct4 = CAST(CAST(RIGHT(@strIP, LEN(@strIP) - (LEN(@strIP) - CHARINDEX('.', REVERSE(@strIP)) 1)) AS int) AS binary(1)) IF @Validate = 1 BEGIN IF NOT( (@oct1 BETWEEN 0x01 AND 0xFF) AND (@oct2 BETWEEN 0x00 AND 0xFF) AND (@oct3 BETWEEN 0x00 AND 0xFF) AND (@oct4 BETWEEN 0x00 AND 0xFF) ) RETURN(NULL) END RETURN (@oct1 @oct2 @oct3 @oct4) END GO 使用例子:SELECT dbo.IPAddrStr2Bin('172.29.23.2', 0) 对于 SQL Server较早的版本，你可以抽出代码，然后直接使用，或者创建如下所示的存储过程：CREATE PROCEDURE dbo.spIPAddrStr2Bin @strIP varchar(15), @binIP binary(4) OUTPUT, @Validate bit = 1 AS IF @Validate = 1 BEGIN -- only digits and dots IF @strIP LIKE '%[^.0-9]%' RETURN (NULL) -- number of dots must be 3 IF LEN(@strIP) - LEN(REPLACE(@strIP, '.', '')) != 3 RETURN (NULL) -- all octets must be specified IF @strIP NOT LIKE '%_%.%_%.%_%.%_%' RETURN (NULL) END DECLARE @oct1 binary(1), @oct2 binary(1), @oct3 binary(1), @oct4 binary(1) SET @oct1 = CAST(CAST(LEFT(@strIP, CHARINDEX('.', @strIP) - 1) AS int) AS binary(1)) SET @oct2 = CAST(CAST(SUBSTRING(@strIP, CHARINDEX('.', @strIP) 1, CHARINDEX('.', @strIP, CHARINDEX('.', @strIP) 1) - CHARINDEX('.', @strIP) - 1) AS int) AS binary(1)) SET @oct3 = CAST(CAST(SUBSTRING(@strIP, CHARINDEX('.', @strIP, CHARINDEX('.', @strIP) 1) 1, (LEN(@strIP) - CHARINDEX('.', REVERSE(@strIP)) 1) - (CHARINDEX('.', @strIP, CHARINDEX('.', @strIP) 1)) - 1) AS int) AS binary(1)) SET @oct4 = CAST(CAST(RIGHT(@strIP, LEN(@strIP) - (LEN(@strIP) - CHARINDEX('.', REVERSE(@strIP)) 1)) AS int) AS binary(1)) IF @Validate = 1 BEGIN IF NOT( (@oct1 BETWEEN 0x01 AND 0xFF) AND (@oct2 BETWEEN 0x00 AND 0xFF) AND (@oct3 BETWEEN 0x00 AND 0xFF) AND (@oct4 BETWEEN 0x00 AND 0xFF) ) RETURN(NULL) END SET @binIP = @oct1 @oct2 @oct3 @oct4 GO 使用例子:DECLARE @binIP binary(4) EXEC dbo.spIPAddrStr2Bin '172.29.23.2', @binIP OUTPUT, 0 PRINT @binIP 注意: 如果你不需要或不想验证自己的字符串IP地址，可以完全删掉对它们进行处理的代码。