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Once all the messages in the queue from that conversation group are processed, the state is updated with any data that has changed while processing the messages. Finally, the transaction commits. This works well if a limited number of messages from the conversation group are on the queue. In applications where a continuous stream of messages arrives on a conversation group, you should consider committing the transaction after a number of messages so that the transactions don t get too big. You ll find more about this topic in the Transaction Management section, where I talk about transaction management with Service Broker. Listing 6-8 shows the basic receive loop pattern. The code in Listing 6-8 assumes that you ve already created a table called ApplicationState with the structure shown in Figure 6-8.

The Snapshot Agent Security window will open, as shown in Figure 20-39. As you can see, I set the Snapshot Agent to run under the SQL Server Agent service account, but it is recommended that you use a Windows domain account. Click OK to return to the Agent Security window (shown previously in Figure 20-38), where you will now see the security settings for both the agents. Click Next to continue.

Figure 6-8. The ApplicationState table Let s have a look at the code. Listing 6-8. The Receive Loop with State Handling CREATE PROCEDURE ProcessOrderMessages AS BEGIN DECLARE @conversationGroup UNIQUEIDENTIFIER; DECLARE @CreditCardValidationStatus BIT; DECLARE @InventoryAdjustmentStatus BIT; DECLARE @ShippingStatus BIT; DECLARE @AccountingStatus BIT; -- Outer Loop (State Handling) WHILE (1 = 1) BEGIN BEGIN TRANSACTION; WAITFOR ( GET CONVERSATION GROUP @conversationGroup FROM [ProductOrderQueue] ), TIMEOUT 1000 IF (@@ROWCOUNT = 0) BEGIN ROLLBACK TRANSACTION BREAK END

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Figure 20-39. Configuring security settings for the Snapshot Agent In the Wizard Actions page, shown in Figure 20-40, check the Create the publication box and click Next. I did not check the Generate a script file with steps to create the publication box, but doing so is recommended so that you will have a script for the configuration of the publication.

Figure 20-40. Specifying the creation of the publication In the Complete the Wizard page of the New Publication Wizard, enter a name for the publication and review the summary, as shown in Figure 20-41. If you are not satisfied with the summary, click the Back button and make your changes. Otherwise click the Finish button. The wizard will show you the results of each of the steps in creating the publication, as shown in Figure 20-42. As when creating other publications, you should save the report for troubleshooting purposes. Click the Close button when you are finished. Now that we have configured the publication in the Oracle Publisher server, our next step is to configure the SQL Server subscription for the Oracle publication.

Figure 5-26. The Marketing Campaign dashboard mock-up Exercise 5-2 walks you through the task of creating a real dashboard to correspond to the mock-up.

-- Retrieving the application state for the current conversation group SELECT @CreditCardValidationStatus = CreditCardValidation, @InventoryAdjustmentStatus = InventoryAdjustment, @ShippingStatus = Shipping, @AccountingStatus = Accounting FROM ApplicationState WHERE ConversationGroupId = @conversationGroup;

In the SSMS, right-click the Local Publications object and select New Subscriptions from the menu. This will start the New Subscription Wizard. Click Next on the welcome page, and you will see the Publication page of the wizard, as shown in Figure 20-43. You can see the name of the Oracle Publisher (ORCL) and the names of the publications for the ORCL Publisher server. Select the publication pub_oe_oracle, and then click Next.

IF (@@ROWCOUNT = 0) BEGIN -- There is currently no application state available, -- so we insert the application state into the state table SET @CreditCardValidationStatus = 0; SET @InventoryAdjustmentStatus = 0; SET @ShippingStatus = 0; SET @AccountingStatus = 0; -- Insert the state record INSERT INTO ApplicationState ( ConversationGroupId, CreditCardValidation, InventoryAdjustment, Shipping, Accounting ) VALUES ( @conversationGroup, @CreditCardValidationStatus, @InventoryAdjustmentStatus, @ShippingStatus, @AccountingStatus ) END DECLARE @messageTypeName NVARCHAR(256); DECLARE @ch UNIQUEIDENTIFIER; DECLARE @messageBody XML;

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