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http://<ComputerName>/ReportServer /<FolderPath>/ <DataSourceName>
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where <FolderPath> is the folder path of the folder where the shared data source resides and <DataSourceName> is the name of the shared data source. Optionally,
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ON-DEMAND REPORT DELIVERY
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as a performance enhancement technique, you can let the Report Server know that you indeed mean to view the data source definition by using the GetDataSourceContents command, as follows:
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http://localhost/ReportServer /AWReporter/AW Shared DS& rs:Command=GetDataSourceContents
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This request asks for the contents of the AW Shared DS shared data source. When a shared data source is requested, the Report Server will stream its definition in XML, as shown here:
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<DataSourceDefinition> <Extension>SQL</Extension> <ConnectString>data source=.; </ConnectString> <!-The rest of the data source definition</DataSourceDefinition>
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Even though the password is not returned, you should avoid allowing users to see the data source definition for security reasons. To prevent users from doing so, exclude the View Data Sources task from their security policy, as we discussed in chapter 9. Requesting other resources If a report is requested, the Report Server renders the report in the specified format. We discuss this in detail in section 10.2.3. If an image is requested, the image will be rendered in the browser. For other resource requests, the Report Server will stream the file content to the browser. In most cases, your applications will request reports by URL. To custom-tailor the report output, you can use a variety of commands, which we discuss in section 10.2.4. First, though, let s take a closer look at how to request a report. 10.2.3 Requesting reports by URL When requesting reports, at minimum you need to specify the report path and the name of the report, for example:
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http://localhost/reportserver /AWReporter/Sales By Territory
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Here, we are requesting the Sales by Territory report located in the AWReporter folder. As we mentioned in section 10.2.1, you can also optionally pass other arguments to control the report processing (see table 10.2). One of the most common uses of the URL arguments is to pass parameter values when requesting parameterized reports. Passing report parameters To request a report that takes parameters, you append them to the URL string in the form of query parameters. For example, the URL string to request the Sales by Territory Interactive report for the year 2004 and Northwest is:
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URL-BASED REPORT ACCESS
http://localhost/reportserver /AWReporter/Sales By Territory Interactive&Year=2004&Territory=1
There are a few rules worth mentioning when requesting parameterized reports, as follows: Default values If the parameter has a default value and you want to use it when requesting the report, you don t have to pass the parameter value explicitly. Parameters with labels and values If the parameter is defined with a label and a value, the value must be passed. The previous example adheres to this rule by using the value of the Territory parameter (1), not its label (Northwest). Missing parameter value If you don t pass the parameter value in the URL request and the parameter doesn t have a default value, the Report Server will react to this condition differently, depending on the export format requested. If HTML is requested and the report toolbar is not suppressed, the Report Server will generate the parameter area of the report toolbar so that the user can enter the report parameters. In all other cases, an exception will be thrown. Parameter validation The parameter validation and type casting are performed on the server side. If a parameter doesn t validate successfully, the Report Server throws an exception, for example:
The value provided for the report parameter 'Territory' is not valid for its type. (rsReportParameterTypeMismatch).
The Report Server doesn t set any specific HTTP response codes when reporting errors. Instead, the error string is shown in the browser. Therefore, you cannot programmatically react to error conditions when requesting reports via URL. 10.2.4 Working with report commands The Report Server recognizes several commands that you can specify by using the rs argument, such as commands for exporting reports and requesting report history snapshots. For a full list of all supported commands, refer to the product documentation. Rendering commands For better performance, you can explicitly tell the Report Server that you mean to render a report by using the rs:Command=Render argument, for example:
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