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if Not Page.IsPostBack then txtTitle.text = selectedDVD.childNodes(0).InnerText txtFormat.text = selectedDVD.childNodes(1).InnerText txtGenre.text = selectedDVD.childNodes(2).InnerText end if end sub Private Sub btnEdit_Click(sender As Object, e As EventArgs) selectedDVD.childNodes(0).InnerText = txtTitle.text selectedDVD.childNodes(1).InnerText = txtFormat.text selectedDVD.childNodes(2).InnerText = txtGenre.text myXmlDocument.Save(Server.Mappath("dvd.xml")) lblMessage.text = "You have successfully updated the DVD" End Sub </script> This time, the page starts with declarations and creates some variables: <%@ Page Language="VB" %> <%@ import Namespace="System.Xml" %> <script runat="server"> Dim intDVDID as integer Dim myXmlDocument as XmlDocument = new XmlDocument() Dim rootNode as XMLElement Dim selectedDVD as XMLElement It then runs code in response to the page loading. The subroutine retrieves the id from the querystring and loads the dvd.xml document: Sub Page_Load(Src As Object, E As EventArgs) intDVDID = request.querystring("id") myXmlDocument.Load (server.mappath("dvd.xml")) Next, it sets the rootNode variable and determines which <DVD> element to modify: rootNode = myXmlDocument.DocumentElement selectedDVD = rootNode.childNodes(intDVDID-1) Notice that the code has to subtract one from the id value because the childNodes list is zero-based. The subroutine then loads the details of the selected <DVD> element into the interface, using the InnerText property of each child node: if Not Page.IsPostBack then txtTitle.text = selectedDVD.childNodes(0).InnerText txtFormat.text = selectedDVD.childNodes(1).InnerText txtGenre.text = selectedDVD.childNodes(2).InnerText end if end sub

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Java developers are very familiar with the try-catch-finally block as this is the main mechanism that is used to perform exception handling. Python exception handling differs a bit from Java, but the syntax is fairly similar. However, Java differs a bit in the way that an exception is thrown in code. Now, realize that I just used the term throw this is Java terminology. Python does not throw exceptions, but instead it raises them. Two different terms which mean basically the same thing. In this section, we ll step through the process of handling and raising exceptions in Python code, and show you how it differs from that in Java. For those who are unfamiliar, I will show you how to perform some exception handling in the Java language. This will give you an opportunity to compare the two syntaxes and appreciate the flexibility that Python offers. Listing 7-1. Exception Handling in Java try { // perform some tasks that may throw an exception } catch (ExceptionType messageVariable) { // perform some exception handling } finally { // execute code that must always be invoked }

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If you take the intersection of two compatible tables, you will retrieve those rows that are found in both tables. The intersection of our two tables, ClubA and ClubB, is reproduced in Figure 7-9, and the algebra expression is in Listing 7-11.

Clicking the btnEdit button calls the btnEdit_Click sub: Private Sub btnEdit_Click(sender As Object, e As EventArgs) selectedDVD.childNodes(0).InnerText = txtTitle.text selectedDVD.childNodes(1).InnerText = txtFormat.text selectedDVD.childNodes(2).InnerText = txtGenre.text myXmlDocument.Save(Server.Mappath("dvd.xml")) lblMessage.text = "You have successfully updated the DVD" End Sub This subroutine sets the InnerText value from the values entered into the text fields. It then uses the Save() method to update the dvd.xml document and displays a message. As before, you need to make sure that you ve set the appropriate permissions to allow updating.

Now let s go on to learn how to make this work in Python. Not only will we see how to handle and raise exceptions, but you ll also learn some other great techniques such as using assertions later in the chapter.

The keyword for the intersection operator in SQL is INTERSECT. The expression to retrieve the two rows (for Barbara Olson and Robert Pollard) is shown in Listing 7-12.

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How often have you been working in a program and performed some action that caused the program to abort and display a nasty error message It happens more often than it should because most exceptions can be caught and handled nicely By nicely, I mean that the program will not abort and the end user will receive a descriptive error message stating what the problem is, and in some cases how it can be resolved The exception handling mechanisms within programming languages were developed for this purpose Listing 7-2 try-except Example # This function uses a try-except clause to provide a nice error # message if the user passes a zero in as the divisor >>> from __future__ import division >>> def divide_numbers(x, y): .. try: .. return x/y .. except ZeroDivisionError: .. return 'You cannot divide by zero, try again' # Attempt to divide 8 by 3 >>> divide_numbers(8,3) 2.

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