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Another popular scenario where expression-based queries can be useful is when the report takes a multivalue parameter. 10 shows how this can be done. Now that you know how to create basic dataset queries, let s see how we can make them more flexible by using parameters.
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Your dataset queries won t be very useful if they don t allow users to pass parameters. Report and query parameters give users the option to alter the report execution and subset of data shown in the report. For example, you can add a parameter to the Sales by Territory report to enable users to specify the sales year rather than defaulting to the current year. We ll see exactly how to do this in section 3.4.2.
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The role of parameters Recall from chapter 1 that the Report Server enjoys a service-oriented architecture that is entirely server based. We also said that with RS reports can be requested by URL and SOAP. The Report Server doesn t offer an object model that can be instantiated and manipulated locally by the report consumer, as you would have probably done in the past with other reporting tools for example, using OLE Automation to control Microsoft Access. Instead, the only way to control the report-generation process from outside is by using parameters, as shown in figure 3.16. If you are accustomed to object-oriented programming, this may seem strange at first. But consider the benefits. The service-oriented architecture of the Report Server eliminates tight coupling between the consumer and server. If the Report Server had an object model that could be instantiated locally by the report consumer, then most likely its client base would have been restricted to .NET-based applications only. Instead, thanks to its service-oriented architecture, RS can be integrated with any type of consumer. Developers familiar with designing stateless web services will find the Report Server programming model similar.
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Figure 3.16 From the report consumer perspective, the Report Server can be viewed as a black box that accepts report requests and optionally parameters and returns reports.
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The RS report-processing model is stateless because once the report is generated, the Report Server discards any state associated with the report request. As far as the reportgeneration process is concerned, you can think of the Report Server as a black box that accepts a report request (optionally parameterized) and returns the generated report. Do you want to sort the report data in a different way Do you want to filter out the data that the data source returns Do you want to show or hide certain report items based on runtime conditions By using parameters, coupled with custom expressions inside the report, you can achieve just about anything you can otherwise accomplish with an object model. For example, hardcoding criteria in your queries is convenient for the developer but not very useful for the end users. Often, you will need to make the report interactive by allowing the users to pass report parameters. To accomplish this, a parameter value can be passed to the dataset query or stored procedure to filter out the report data. 3.4.2 Building parameter-driven queries Let s see how we can make our Sales by Territory report interactive by allowing the user to specify the sales year instead of always defaulting to the current year. We can easily change the report dataset query to use a query parameter. Since we are using SQL Server as a database, we need to use named parameters.
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The named parameter syntax is specific to the data extension. In the SQL .NET provider you use named parameters (@varname). With the Oracle data extension you use named parameters but with a different prefix (:varname). The OLE DB provider doesn t support named parameters, but you can use the question mark ( ) for parameter placeholders.
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Let s make the query parameter-driven by following these steps: Step 1 Start by saving the Sales by Territory report to Sales by Territory Interactive report. The easiest way to accomplish this is to right-click on the Sales by Territory report in the Solution Explorer and choose Copy. Step 2 Right-click on the project node (AWReporter) and choose Paste. Rename the new report to Sales by Territory Interactive. Step 3 Open the AW2000_Shared_DS dataset inside the Graphical Query Designer and replace the DATEPART(yy, GETDATE()) criteria with @Year, as shown in listing 3.3:
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