從 CLR UDF 存取機器碼

這個範例會示範如何從資料庫內組件中的使用者定義函數來叫用原生 (Unmanaged) C++ 程式碼的函數。

在此範例中，工作目錄應該是 c:\test 。

請先編譯 C++ 程式碼：

// Win32Sleep.cpp  
// compile with: /LD /link /noentry kernel32.lib  
#include <windows.h>  
  
extern "C"  
__declspec( dllexport ) void _cdecl SleepyLoop(DWORD sleep_interval) {  
   Sleep(sleep_interval);  
}  

接下來，將 C# 程式碼編譯為組件：

// proc.cs  
// compile with: /target:library  
using System;  
using System.Threading;  
using System.Data.Sql;  
using System.Runtime.InteropServices;  
  
public class StoreProcedures {  
  
   public static readonly uint SLEEP_LOOP_TIMES = 10;  
   public static readonly uint SLEEP_DURATION = 1000;  
  
   [DllImport(@"c:\test\Win32Sleep.dll")]  
   internal static extern void SleepyLoop(uint sleepInterval);  
  
   public static void SleepInProcedure(int loopTimes) {  
      for ( int i = 0 ; i < loopTimes ; i++ ) {  
         // invoke the unmanaged routine  
         SleepyLoop(SLEEP_DURATION);  
      }  
   }  
}  

最後，執行下列 Transact-SQL：

USE MASTER  
GO  
  
IF DB_ID('testdb') IS NOT NULL  
DROP DATABASE testdb  
GO  
  
CREATE DATABASE testdb  
GO  
  
USE testdb  
GO  
  
ALTER DATABASE testdb SET TRUSTWORTHY ON   
GO  
  
sp_configure 'show advanced options', 1  
GO  
RECONFIGURE  
GO  
sp_configure 'clr enabled', 1  
GO  
RECONFIGURE  
GO  
  
CREATE ASSEMBLY myasm FROM 'c:\test\proc.dll' WITH PERMISSION_SET=UNSAFE   
go  
  
CREATE PROCEDURE SleepProc(@loopTimes INT)  
AS EXTERNAL NAME myasm.[StoreProcedures].[SleepInProcedure]  
go  
  
-- sleep 5 seconds  
EXEC SleepProc 5  
GO  

另請參閱

Common Language Runtime (CLR) 整合的使用案例和範例