tailieunhanh - Microsoft SQL Server 2008 R2 Unleashed- P200

Microsoft SQL Server 2008 R2 Unleashed- P200:SQL Server 2005 provided a number of significant new features and enhancements over what was available in SQL Server 2000. This is not too surprising considering there was a five-year gap between these major SQL Server 2008 is not as much of a quantum leap forward from SQL Server 2005 | 1984 CHAPTER 49 SQL Server Service Broker received within the specified time the code successfully locks that conversation group that is locks the specified queue for receiving . If not @ConversationGroupId is NULL. After this call the program attempts to receive the next message in the queue by using the RECEIVE statement whose syntax is similar to that of SELECT except that instead of specifying a table name you specify a queue name. Next the code checks the received message type and takes the appropriate action. If the message type is Error it ends the dialog reporting the error. If the message type is EndDialog it simply ends its side of the dialog. If it is a catalog change message it updates so that the related row in which associates products with catalogs now points to the newest data. Just as with the initiator code the target code first declares its outgoing messages as a typed XML variable @AckXml . This helps in making sure that the outgoing message will be received without error. One issue to be mindful of is that all this code is executing in the scope of a single transaction. If any part of the code fails the ROLLBACK statement rolls back any DML as well as message sends and receives. To test the code you can execute the following statement EXEC 749 A Super Product1 NOTE You might want to come up with a clever way of populating the body of the responding stored procedure to deal with the incoming acknowledgment messages sent by the target. Prioritizing Services The next issue to consider is conversation priority. A safe assumption is that some of your software applications are more important than others. Likewise some of your SSB services are mission-critical and should be configurable as such and others may be only for casual use. You can easily set a numeric priority for these services so that when system resources are scarce during .

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