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As the name suggests, this is the VBScript that adds a set of subscribers to the instance. Open the file AddSubscribers.vbs in Notepad using the following command (or you can use another editor if you prefer). Open a Notification Services Command Prompt on your development machine and navigate to the Chapter 3 scripts directory by typing the following command:
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I'm not going to describe any of the details of the subscription management API until Chapter 7, but if you're curious, you can follow these instructions to view the code in the VBScripts we'll be using in this chapter: Internally, these scripts actually use the same APIs that a real subscription management system would use they just don't provide a fancy user interface. Instead, we'll just use some VBScripts to enter subscriptions.
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Entering Subscriptionsīecause this is just a sample, we won't build a full subscription management system (doing so would mean building either a Web application or a Win32 application, both of which would distract attention from the core SQL-NS concepts). To submit a batch of events, simply copy this sample data file into the events watch directory. Open the file EventData.xml in Notepad (or your XML editor): Open a Notification Services Command Prompt on your development machine, and navigate to the sample data directory by typing the following commandĬd /d C:\SQL-NS\Chapter03\Stock\SampleData
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You can certainly re-use the same command prompt across different instruction sets if you choose. This instruction is repeated each time just to ensure that every instruction set is self-contained. You can take a look at a sample event file to see what the data looks like:Īll instruction sets in this and future chapters that involve command-line operations begin with a step that instructs you to open a command prompt. Each event specifies a stock symbol and stock price, the fields required by the event class (as you saw in Listing 3.2). For this simple stock example, we'll use a sample stock data file that contains a few stock events. These arguments tell it which filesystem directory to watch and provide a schema for the XML data files that will be dropped in that directory. The declaration of the FileSystemWatcher event provider shown in Listing 3.7 included a set of runtime arguments.
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Chapter 8 covers how to build a real event provider and get events from real sources.Īs mentioned in the " Event Collection" section, we'll use the built-in FileSystemWatcher event provider supplied by SQL-NS to get events into the application. Because this is a sample application, and its purpose is to illustrate the core SQL-NS concepts, not the mechanics of reading from stock market data sources, we'll just submit some sample event data from a file. If this were a real application, it would use an event provider that would read and submit real stock data from one of many stock market data publishers. Listing 3.10 The ICF That Defines the SQL-NS Instance That Hosts the Stock Application Chapter 4, "Instances and the Instance Configuration File," covers the instance concepts and all the elements of the ICF in detail. I've included the text of the ICF in Listing 3.10, but I will not go into an explanation of it here because most of the details are not relevant at this point. This sample's ICF creates an instance called "Chapter03". The ICF defines the list of applications in the instance (here, just one, the stock application) and the set of delivery channels that applications in the instance can use to send notifications. In SQL-NS, an instance is defined by an Instance Configuration File (ICF). Each instance is an independent entity that can be started, stopped, and configured on its own. A SQL-NS instance is a single, named configuration of SQL-NS that can host one or more applications. SQL-NS has the concept of instances, in much the same way that SQL Server does. This section briefly describes those pieces as they pertain to the stock application. The ADF defines the core of the application, but several other pieces are required to make it run. Learn More Buy Specifying Other Parts of the Stock Application
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Microsoft SQL Server 2000 Notification Services