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In the first example, PopDataSet (Listing 13-1), you saw how simple it is to get data into a dataset. The second example, FilterSort (Listing 13-2), was just a variation, demonstrating how multiple result sets are handled and how to filter and sort data tables. However, the two programs have one major difference. Did you notice it FilterSort doesn t explicitly open a connection! In fact, it s the first (but won t be the last) program you ve written that doesn t. Why doesn t it The answer is simple but very important. The Fill method automatically opens a connection if it s not open when Fill() is called. It then closes the connection after filling the dataset. However, if a connection is open when Fill() is called, it uses that connection and doesn t close it afterward. So, although datasets are completely independent of databases (and connections), just because you re using a dataset doesn t mean you re running disconnected from a database. If you want to run disconnected, use datasets, but don t open connections before filling them (or, if a connection is open, close it first). Datasets in themselves don t imply either connected or disconnected operations. You leave the standard conn.Close(); in the finally block. Since Close() can be called without error on a closed connection, it presents no problems if called unnecessarily, but it definitely guarantees that the connection will be closed, whatever may happen in the try block.

' Display output parameter Console.WriteLine( _ "The output parameter value is {0}", _ cmd.Parameters("@ordercount").Value _ )

So which one of these methods should you use to index your documents That depends on how lazy or how much of a control freak you are. Seriously, the degree of control you need, the amount of time you have to accomplish what you need to do, and many more factors dictate which method you employ. Ultimately you must decide. It s time to move on to another document format. Like it or not, Microsoft document formats are ubiquitous in today s world. Knowing how to get at their content and being able to put it into an index is a critical skill. Let s see how we can achieve this.

' Display return value Console.WriteLine( _ "The return value is {0}", _ cmd.Parameters("return_value").Value _ )

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The Apache POI Project exists to create and maintain pure Java APIs for manipulating various file formats based on Microsoft s OLE 2 Compound Document format. In short, it allows you to read and write MS Excel files using Java. As we ll show with example code, you can also read and extract text from Microsoft Word documents. The project is located at http://poi.apache.org/. Here are the different APIs and the application they are tied to: A set of pure Java APIs for reading and writing OLE 2 Compound Document formats HSSF APIs for reading and writing Microsoft Excel 97 (Windows XP) spreadsheets HWPF APIs for reading and writing Microsoft Word 97 (Windows XP) documents HSLF APIs for reading and writing Microsoft PowerPoint 97 (Windows XP) documents HDGF APIs for reading and writing Microsoft Visio documents HPSF APIs for reading MFC property sets POI welcomes anyone who is willing to help with the project, because a lot of work remains to be done. The developers could use help in all aspects, including bug reports, feature requests, and, just like every other project, documentation. If you re interested, join their mailing lists at http://poi.apache.org/mailinglists.html and make yourself known.

s Note If you want to prove this for yourself, simply open the connection in FilterSort before calling

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