上一篇【用 SQL 語法查詢符合條件範圍的 IP】中的 IP2INT 的 SQL 語法實在是太醜陋了，所以利用 SQL 可呼叫 CLR 的方式來撰寫查詢。
1. 用 C# 撰寫 SQL Function，請自行編譯成 IPUtility.dll
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using System;
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using System.Data.SqlTypes;
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using Microsoft.SqlServer.Server;
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public class IPUtility
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{
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[SqlFunction]
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public static SqlInt32 IsInRange(SqlString ip, SqlString startIP, SqlString endIP)
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{
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if (IPToLong(startIP) <= IPToLong(ip) && IPToLong(ip) <= IPToLong(endIP) )
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{
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return 1;
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}
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return 0;
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}
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private static long IPToLong(SqlString ip)
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{
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string [ ] ipClass = ip.ToString ( ).Split ( );
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string strhexip = string.Format ( "{0:X2}{1:X2}{2:X2}{3:X2}", int.Parse (ipClass[ 0 ] ), int.Parse (ipClass[ 1 ] ), int.Parse (ipClass[ 2 ] ), int.Parse (ipClass[ 3 ] ) );
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return Convert.ToInt64 (strhexip, 16 );
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}
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}
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2. 在 SQL 引入 IPUtility 並建立 Function
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-- Enable CLR integration (啟動 SQL Server 2005 CLR 功能)
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sp_configure 'clr enabled', 1
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GO
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RECONFIGURE
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GO
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-- Register Assembly (註冊組件)
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USE master
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CREATE ASSEMBLY IPUtility
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FROM 'C:\TMP\IPUtility.dll' -- 請依照 dll 放置位置填寫
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WITH PERMISSION_SET = Safe
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GO
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---- Drop assembly
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--DROP ASSEMBLY IPUtility
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--GO
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-- Create the managed user-defined function
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USE master
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GO
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CREATE FUNCTION dbo.IsInRange
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(
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@IP nvarchar( 15 ), @startIP nvarchar( 15 ), @endIP nvarchar( 15 ) -- 需要三參數: 比對 IP, 範圍起始 IP , 範圍結束 IP
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)
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RETURNS int
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AS EXTERNAL NAME IPUtility.IPUtility.IsInRange
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GO
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-- Test Run (測試 Function)
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DECLARE @IPTable TABLE (IP nvarchar( 15 ) )
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INSERT INTO @IPTable VALUES ( N'172.16.57.103' )
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INSERT INTO @IPTable VALUES ( N'172.16.58.103' )
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INSERT INTO @IPTable VALUES ( N'172.16.59.103' )
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INSERT INTO @IPTable VALUES ( N'172.16.60.103' )
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INSERT INTO @IPTable VALUES ( N'172.16.61.103' )
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INSERT INTO @IPTable VALUES ( N'172.16.62.103' )
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SELECT IP
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FROM @IPTable
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WHERE dbo.IsInRange(IP, '172.16.58.103', '172.16.61.109' ) = 1
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GO
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OUTPUT:
172.16.58.103
172.16.59.103
172.16.60.103
172.16.61.103
