建立 CLR Stored Procedure/Function 的小範例

SQL Server 2005 中, 直接叫用.NET組件是個很特別的功能; 它的使用時點在於當 SQL Program 無法快速有效率的處理我們想做的事, 而且.NET code可以做的比 SQL Program 好時, 我們可以在 SQL Program 中直接叫用 .NET組件中的類別方法, 這些Method必須是static, 這些Method可以被視為Function, Stored Procedure的方式來使用.

以下是一連串的步驟, 說明建立的過程.

1. 標示指定Method

在想要成為CLR Function/Stored Procedure的Static Method上設定Attribute.

   1: using System;

   2: using System.Collections.Generic;

   3: using System.Text;

   4:  

   5: using Microsoft.SqlServer.Server;

   6:  

   7: namespace HowardCLRInSQLSample

   8: {

   9:     public class HelloCLR

  10:     {

  11:         [SqlFunctionAttribute(Name = "FN_Hello")]

  12:         public static string FN_Hello()

  13:         {

  14:             return "Hello, CLR Function In SQL !!";

  15:         }

  16:  

  17:         [SqlProcedureAttribute(Name = "SP_Hello")]

  18:         public static void SP_Hello()

  19:         {

  20:             SqlContext.Pipe.Send("Hello, CLR Stored Procedure In SQL !!");

  21:         }

  22:     }

  23: }

2. SQL Server 環境建立

   1: -- 啟用SQL Server中的 CLR功能 (預設為關閉)

   2: -- 必須擁有 sysadmin 或 serveradmin 的權限才能啟用此功能

   3: sp_configure 'clr enabled', 1

   4: GO

   5: RECONFIGURE

   6: GO

   7:  

   8: -- 同時必須設定 指定db - Compatibility level -> 90 (即database為SQL Server 2005) 

   9: sp_dbcmptlevel OFD_POLARIS_CUR_EC, 90

3. 註冊組件, 建立CLR Function/Stored Procedure

   1: -- 登錄組件 HowardCLRInSQLSample.dll

   2: -- 任何登錄之後的任何變動(re-build) 皆需重登錄

   3: IF EXISTS (SELECT [name] FROM sys.assemblies WHERE [name] = N'HowardCLRInSQLSample')

   4: DROP ASSEMBLY HowardCLRInSQLSample;

   5: GO

   6:  

   7: CREATE ASSEMBLY HowardCLRInSQLSample

   8: FROM 'H:\00 IT\Database\SQL Server\SQL 2005\clr in sql server\HowardCLRInSQLSample\HowardCLRInSQLSample\bin\Debug\HowardCLRInSQLSample.dll'

   9: WITH PERMISSION_SET = SAFE;

  10: GO

  11:  

  12: -- 可以用assembly_files來檢視組件的路徑

  13: select * from sys.assembly_files

  14:  

  15: -- 建立clr function

  16: if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[FN_Hello]') and xtype in (N'FN', N'IF', N'TF', N'FS'))

  17:     drop function [dbo].[FN_Hello]

  18: GO

  19:  

  20: CREATE FUNCTION [dbo].[FN_Hello] ()

  21: Returns  nvarchar(100)

  22: EXTERNAL NAME HowardCLRInSQLSample.[HowardCLRInSQLSample.HelloCLR].FN_Hello

  23:  

  24:  

  25: -- 建立clr sp

  26: IF EXISTS (SELECT * FROM sys.procedures WHERE [name] = N'SP_Hello')

  27:     DROP PROCEDURE [dbo].[SP_Hello];

  28: GO

  29:  

  30: CREATE PROCEDURE [dbo].[SP_Hello]

  31: AS EXTERNAL NAME HowardCLRInSQLSample.[HowardCLRInSQLSample.HelloCLR].SP_Hello

  32: GO

4.大功告成. 就如同使用一般function與stored procedure的方式.

   1: select [dbo].[FN_Hello]()

   2:  

   3: exec SP_Hello

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