SQL Server 2005 Beta 2 Service Broker: Stored Procedure acts as a service program

SQL Server 2005 Beta 2 Service Broker: Stored Procedure acts as a service program

 

Posted by: Rickie Lee (www.cnblogs.com/rickie)

Date: Apr. 2005

这里演示同一个SQL Server中不同数据库之间的基于Service Broker的异步消息传递,其中Stored Procedure充当Service ProgramHelloWorldDB为目标数据库,DotNetFun2则为消息发送发的数据库。

 

同时,假设Server Broker的基本对象类型已经创建,如MessageType(XMLMessage), Contract(XMLContract), Queue(SendingQueue and ReceivingQueue)等等,具体操作可以参考《A simple tutorial on SQL Server 2005 Beta 2 Service Broker》。另外,因为在不同的Databases之间进行消息传递,因此需要创建Route,具体操作可以参考《SQL Server 2005 Beta 2 Service Broker: Create Route》。

 

1.创建Stored Procedure作为Internal Service Program.

USE HelloWorldDB

GO

 

Alter Procedure HelloWorldResponder

As

Begin

      Declare @conversationHandle UNIQUEIDENTIFIER

      Declare @message_body nvarchar(MAX)

      Declare @message_type_name SYSNAME

      WHILE (1=1)

            BEGIN

            BEGIN TRANSACTION

            -- Wait for 1 seconds for messages to arrive

            WAITFOR (

                  -- For simplicity we process one message at a time

                  RECEIVE TOP(1)   

                    @message_type_name=message_type_name, 

                    @conversationHandle=conversation_handle,

                    @message_body=message_body        

                  FROM [ReceivingQueue]), TIMEOUT 1000

 

            -- If a message was received, process it, else skip

            IF (@@rowcount <= 0)

                  BREAK;     

            -- If this is a XML message,

            -- respond with an appropriate greeting

            IF @message_type_name = 'XMLMessage'

            BEGIN

                  SEND ON CONVERSATION @conversationHandle

                        MESSAGE TYPE XMLMessage

                        ('<hello>Hello From Rickie</hello>')

                  END CONVERSATION @conversationHandle

            END

            COMMIT

      END

      COMMIT

END

GO

 

Stored Procedure负责从ReceivingQueue中检索消息,并根据QueueRetention设置,来确定从Queue中移除消息或更新Queue中消息的状态。

 

2.设置目标队列(Target Queue)的激活机制

Use HelloWorldDB

go

 

ALTER QUEUE [ReceivingQueue] WITH

      ACTIVATION (

            STATUS = ON, -- Turn on internal activation

            PROCEDURE_NAME = [HelloWorldResponder], -- Our stored proc

            MAX_QUEUE_READERS = 4, -- Up to 4 concurrent readers

            EXECUTE AS SELF)  -- Execute as user of incoming dialog

 

设置上述创建的Stored Procedure,该Stored Procedure将被激活并处理Queue中的消息。

 

3.Initiator端发送消息

Use DotNetFun2

go

 

DECLARE @conversationHandle uniqueidentifier

 

BEGIN TRANSACTION

-- Begin a dialog to the Hello World Service

BEGIN DIALOG  @conversationHandle

    FROM SERVICE    [SendingService]

    TO SERVICE      'ReceivingService','a727462b-52e7-4405-9eee-d19923729790'

    ON CONTRACT     [XMLContract]

    WITH ENCRYPTION = OFF, LIFETIME = 600;

 

-- Send message

SEND ON CONVERSATION @conversationHandle

   MESSAGE TYPE [XMLMessage]

   ('<hello>Welcome to Rickie Lee''s blog, www.cnblogs.com/rickie</hello>');

 

Select * From sys.conversation_endpoints

COMMIT

 

其中,TO SERVICE      'ReceivingService','a727462b-52e7-4405-9eee-d19923729790'’ReceivingSerice’表示目标Service名称,'a727462b-52e7-4405-9eee-d19923729790'则指定目标Service所在的数据库,可以通过如下SQL Script获取:

-- Retrieve remote broker instance guid

SELECT service_broker_guid

FROM sys.databases

WHERE database_id = DB_ID('HelloWorldDB')

 

另外,可以通过如下的SQL script来检测Initiator端收到的Reply消息:

Select cast(message_body as XML) From SendingQueue

 

Receive message_type_name,

      cast(message_body as XML)

      From SendingQueue

 

4.查询对话端点状态(State of Conversation Endpoints

最后,可以通过在Target/Initiator端查询sys.conversation_endpoints表,获取Dialog对话状态:

Select * From sys.conversation_endpoints

 

更详细操作可以查询《SQL Server 2005 Beta 2 Service Broker: State of conversation endpoint》。

 

References:

1.Rushi Desai, Activating stored procedures asynchronously, http://blogs.msdn.com/rushidesai/archive/2005/02/08.aspx

2.Rickie Lee’s blog, A simple tutorial on SQL Server 2005 Beta 2 Service Broker

3.Rickie Lee’s blog, SQL Server 2005 Beta 2 Service Broker: Create Route

 

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