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This SQL code intentionally forces an error in the Execute SQL Task when trying to convert a text value to an integer. Click OK to close the Enter SQL Query dialog box.

Figure 8.2 When start() is called on an HttpRequest object, a second thread takes over and communicates its progress through callback events, allowing the GUI thread to get back to its work.

If XmlReader has been positioned on an attribute, you can use ReadInnerXml and ReadOuterXml to return strings based on the attribute content. For example, consider the following XML fragment:

Change the Name property within the Execute SQL Task Editor dialog box to force failure. design surface. Figure 2-5 shows what your control flow should look like with the new Execute SQL Task.

figure 2-5 The new Force Failure Execute SQL Task in the MyPackage.dtsx package is added below the Data Flow Task.

If the XmlReader is positioned on the length attribute, ReadInnerXml returns the fol lowing string:

birt code 128, birt report qr code, birt data matrix, birt upc-a, birt barcode maximo, birt code 39

sequence into a web-like query string, and append it to the REST base URL. The onResponseCode, onException, and onInput event function types will be called at different stages of the request life cycle. The HttpRequest class actually has a host of different functions and variables to track the request state in fine detail (check the API docs), but typically we don t need such fine-grained control. The onResponseCode event is called when the initial HTTP response code is received (200 means ok ; other codes signify different results), onException is called if there s an I/O problem, while onInput is called when the result actually starts to arrive. The onInput call passes in a Java InputStream object, which we can assign a parser to. The JavaFX class PullParser is just such a parser. It reads either XML- or JSON-formatted data from the input stream and breaks it down into a series of events. To receive the events we need to register a function. But because our particular project needs to store some of the data being returned, I ve written not just a single function but an entire class (the FlickrResult class) to interact with it. And that s what we ll look at next.

10. 11.

and does not advance the position of the reader. Likewise, given the same fragment and starting position, ReadOuterXml returns the following string:

Open SQL Server Management Studio (SSMS) and connect to the Database Engine. Open a new database query against the AdventureWorks2008 database. Run the following SQL statement, and then observe the results:

Because we need somewhere to store the data we are pulling from the web service, we ll create an entire class to interact with the parser. That class is FlickrResult, taking each XML element as it is encountered, extracting data, and populating its variables. The class also houses a FlickrPhoto sequence, to store details for each individual photo. Listing 8.4 is the first part of our class to process and store the information coming back from the web service.

length="12"

Return to BIDS, and then execute the SSIS package you just modified, which intentionally fails at the last step. Before stopping the package in Debug mode, open the Data Flow Task and note that the SSIS Designer shows a couple thousand rows inserted into the Sales_Summary table. Stop the package execution, and then rerun the query from step 11. You should see the same number of rows. Observe that even though the Data Flow Task was successful, the data was rolled back. This is because the Sequence Container was configured with the TransactionOption setting as Required and the last task within the Sequence Container failed, therefore rolling back the Data Flow Task data.

Listing 8.4 FlickrResult.fx (part 1)

13. 14.

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