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In 4, I introduced the idea of relaxation and gradual improvement. In 8, you saw the idea applied to finding shortest paths in DAGs. In fact, the iterative shortest path algorithm for DAGs (Listing 8-4) is not just a prototypical example of dynamic programming; it also illustrates the fundamental structure of the algorithms in this chapter: we use relaxation over the edges of a graph to propagate knowledge about shortest paths. Let s review what this looks like. I ll use a dict of dicts representation of the graph, and a dict D to maintain distance estimates (upper bounds), like in 8. In addition, I ll add a predecessor dict, P, as for many of the traversal algorithms in 5. These predecessor pointers will form a so-called shortest path tree and will allow us to reconstruct the actual paths that correspond to the distances in D. Relaxation can then be factored out in the relax function in Listing 9-1. Note that I m treating nonexistent entries in D as if they were infinite. (I could also just initialize them all to be infinite in the main algorithms, of course.) Listing 9-1. The Relaxation Operation inf = float('inf') def relax(W, u, v, D, P): d = D.get(u,inf) + W[u][v] if d < D.get(v,inf): D[v], P[v] = d, u return True



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reservation.getPlayer().getPhone()); } } } In the preceding Excel view, you first create a sheet in the workbook. In this sheet, you show the headers of this report in the first row. Then you iterate over the reservation list to create a row for each reservation. As you have ResourceBundleViewResolver configured in your web application context, you can add the following entry to views.properties in the classpath root to define this view: excelSummary.(class)= com.apress.springrecipes.court.web.view.ExcelReservationSummary As you have ControllerClassNameHandlerMapping configured in your web application context, you can access this controller through the following URL. When calling this controller, you must specify the request parameters date and format. http://localhost:8080/court/reservationSummary.htm date=2008-01-14&format=excel

Now in real code, you wouldn t hard-code the username and password as shown above. The point is to show how to use a properties file to pass parameters to the driver.





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I was working on a web application recently where the application locked up every time we stress tested it with thousands of database transactions. We were getting very frustrated because we couldn t release the application to production until it could reliably handle thousands of transactions per hour. The database vendor included a management utility for their system that showed how many database connections had been opened, and how many had been released. Whenever we tested our application, the utility would show that the number of opened connections slowly but steadily diverged from the number of released connections. It turned out that the developer who had written the JDBC code hadn t understood how to release connections properly. Sometimes the connections were not released; sometimes the same connection was released more than once. Whenever we tested the code, it didn t take long for the defects in the code to cause the system to be starved for connections. After enough time, the application just locked up, waiting for connections that were no longer available. By now you should see the importance of releasing connections. The Connection class has a method for releasing the connection:

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Creating PDF Views A PDF view is created by extending the AbstractPdfView class. In the buildPdfDocument() method, you can access the model passed from the controller and also a precreated PDF document. Your task is simply to populate the document with the data in the model.

Many beginners will try to use it like this:

Connection conn = DriverManager.getConnection(url); // Then some JDBC code that works with the database conn.close();

Possible shortcut estimate Is it really a shortcut Update estimate and parent There was a change!

s Note To generate PDF files with iText in a web application, you must copy itext-1.4.8.jar (located in

This is a mistake! Almost all JDBC methods throw SQLExceptions (which are discussed in the next section). If the JDBC code between the getConnection() method call and the close() method call throws a SQLException, the call to close() is completely skipped. The correct way to use close() , when the close() method is in the same method as the connection code, is to put it inside the finally block of a try...catch...finally exception handler. Thus, you are ensured that close() will be called no matter what happens with the JDBC code. And since close() also throws an SQLException, it needs to be inside a try...catch block as well. So, JDBC code begins to look something like this:

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