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Although it is always good programming practice to put a semicolon (;) at the end of each T-SQL statement, it is required in the statement preceding a RECEIVE statement in a batch.
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Lesson 3: Implementing Service Broker Solutions
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implementing a Simple Service broker Solution
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In this practice, you create the components required for a simple Service Broker solution. You also create a dialog, send messages on the dialog, and receive messages from the queue.
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e xercise 1
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In this exercise, you create the service definition components required to initiate a Service Broker conversation.
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1. 2.
Start SSMS (if it s not already started), connect to your SQL Server instance, and open a new query window. In the new query window, type and execute the following command to create a master key in the AdventureWorks2008 database:
USE AdventureWorks2008; CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'dyfnds65;sdf%h457!;'
Open a new query window, and type and execute the following script to create the message types and contract to be used by the initiator and target services:
CREATE Message Type AWNewNotice VALIDATION = NONE;
CREATE Message Type AWAck VALIDATION = NONE;
CREATE CONTRACT NewNoticeContract AUTHORIZATION dbo (AWNewNotice SENT BY ANY, AWAck SENT BY ANY );
In the current query window, below the existing text, type, highlight, and execute the following script to create the queues and services for your solution:
CREATE QUEUE AWNewNoticeQueue;
CREATE QUEUE AWAckQueue;
CREATE SERVICE AWNewNoticeService ON QUEUE AWNewNoticeQueue;
CREATE SERVICE AWAckService ON QUEUE AWAckQueue;
Leave SSMS open for the next exercise.
Extending Microsoft SQL Server Functionality with the Spatial, Full-Text Search, and Service Broker
e xercise 2
Send and Receive Messages
In this exercise, you initiate a dialog conversation and send and receive messages on the dialog conversation.
Open a new query window. Type, but do not execute, the following commands to define a dialog conversation between AWNewNoticeService and AWAckService:
DECLARE @dialog_handle uniqueidentifier , @XMLdata XML;
SET @XMLdata = (SELECT * FROM sys.tables FOR XML AUTO);
BEGIN DIALOG @dialog_handle FROM SERVICE AWNewNoticeService TO SERVICE 'AWAckService' ON CONTRACT NewNoticeContract;
In the current query window, below the existing text, type the following command and execute the entire script to start the conversation and send a message on the conversation:
SEND ON CONVERSATION @dialog_handle MESSAGE TYPE AWNewNotice;
Open a new query window, and type and execute the following command to view the AWNewNoticeQueue queue:
SELECT * FROM AWNewNoticeQueue;
In the current query window, below the existing text, type, highlight, and execute the following command to receive the message and view the XML data:
SELECT * FROM AWNewNoticeQueue;
DECLARE @dialog_handle UNIQUEIDENTIFIER , @XMLdata XML;
SET @XMLdata = (SELECT * FROM sys.tables FOR XML AUTO);
RECEIVE TOP (1) @dialog_handle = conversation_handle FROM AWNewNoticeQueue;
END CONVERSATION @dialog_handle;
SELECT @XMLData;
5. 6.
Execute the SELECT * FROM AWNewNoticeQueue statement again to verify that the row is no longer in the queue. Save your scripts and exit SSMS.
Lesson 3: Implementing Service Broker Solutions
Lesson Summary
Service Broker provides reliable asynchronous messaging capabilities for your SQL Server instance. You need to configure the Service Broker components for your solution. These components might include message types, contracts, services, queues, dialogs, and conversation priorities. You use the BEGIN DIALOG, SEND, and RECEIVE commands to control individual conversations between two services.
Extending Microsoft SQL Server Functionality with the Spatial, Full-Text Search, and Service Broker
chapter Review
To practice and reinforce the skills you learned in this chapter further, you can do any or all of the following:
n n n
Review the chapter summary. Review the list of key terms introduced in this chapter. Complete the case scenarios. These scenarios set up real-world situations involving the topics of this chapter and ask you to create solutions. Complete the suggested practices. Take a practice test.
Summary
SQL Server 2008 provides two new spatial data types. The geometry and geography data types can be used to manage spatial data, such as the coordinate location of a classroom in a school or the longitude and latitude of the school s location. The fully integrated full-text search feature allows you to write advanced linguistic searches to locate matching rows with a variety of data types. Service Broker provides you with a reliable, asynchronous messaging system that can provide solutions ranging from within a single database to across multiple instances and servers.
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