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This example demonstrated how easy it is to create relationships using the graphical tools provided by SQL Server Management Studio. You created two relationships with very little work. The only thing that you need to remember is that the relationship is added to the foreign key side of the relationship; the relationship between the Manufacturer table and the Player table is added to the Player table, as this table contains the foreign key. The eagle-eyed among you will notice that you created only two relationships, when I said there would be three relationships. You ll see how to add a relationship between the Format and WhatPlaysWhatFormat tables when we look at another way of creating relationships with database diagrams. When we look at DDL queries in detail in 11, you ll appreciate how much work SQL Server Management Studio is doing on your behalf. For each relationship, SQL Server Management Studio is creating an ALTER TABLE query and executing this against the database. For example, the Manufacture to Player relationship is created using the following SQL query: ALTER TABLE dbo.Player ADD CONSTRAINT FK_Player_Manufacturer FOREIGN KEY (PlayerManufacturerID) REFERENCES dbo.Manufacturer (ManufacturerID) I m sure you ll agree that the graphical tools make this process a lot less painful than having to create a SQL query like this. As you ll see shortly, database diagrams make it even simpler to create a relationship. Although we ve not explicitly looked at editing and deleting existing relationships, it is a painless task and can be accomplished from the Foreign Key Relationships dialog box. Selecting an existing relationship will allow you to edit the details for the relationship. You can choose to delete the relationship by clicking the Delete button.

One of the nicest features of the XmlDocument is its support of searching, which allows you to find nodes when you know they are there somewhere but you aren t sure how many matches exist or where the elements are. To search an XmlDocument, all you need to do is use the GetElementById() or GetElementsByTagName() method. The following code example puts the GetElementsByTagName() method to work and creates the output shown in Figure 19-6:

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Another important consideration when implementing a CAPTCHA test in your web applications is accessibility. If somebody is unable to pass the test, they will be unable to complete the form protected by the CAPTCHA test. As such, it is important to have alternative methods available. One possible solution is to implement an audio CAPTCHA in addition to the text CAPTCHA. This would involve generating an audio file that reads back letters, numbers, or words, which the user must then type in.

XmlDocument doc = new XmlDocument(); doc.Load(file); // Find the matches. XmlNodeList results = doc.GetElementsByTagName("Price"); // Display the results. lblXml.Text = "<b>Found " + results.Count.ToString() + " Matches "; lblXml.Text += " for the Price tag: </b><br><br>"; foreach (XmlNode result in results) { lblXml.Text += result.FirstChild.Value + "<br>"; } This technique works well if you want to find an element based on its name. If you want to use more sophisticated searching, match only part of a name, or examine only part of a document, you ll have to fall back on the traditional standard: looping through all the nodes in the XmlDocument.

In this example, you ll add all three relationships to the MySQL 5.0 database. Unlike SQL Server Management Studio, MySQL Query Browser doesn t provide a diagramming tool, so you need to design all the relationships using the Table Editor dialog box. Again, you first need to create the other tables. To create the remaining three tables, follow the steps again in the Try It Out: Creating a Table in MySQL 5.0 sections, but use the table information for the other tables as listed in Appendix D.

s The search method provided by the XmlDocument class is relatively primitive. For a more advanced Tip

Another alternative is to have a manual registration system, where the user can e-mail their details to the site administrator who can then save their details on their behalf. In 14 we will discuss the implementation of an administration area in our web application. Part of this administration area will be a user management section where an administrator could manually create new users.

Follow these steps to add the relationships: 1. Open MySQL Query Browser if it isn t already running and connect to the localhost server using the login details that you used earlier. 2. Expand the Players database in the Schemata pane. 3. Right-click the Player table and select Edit Table to open the Table Editor dialog box. The Foreign Keys tab in the lower half of the dialog box allows you to create, edit, and delete any foreign keys on this table. Initially, it will not contain any relationships, as shown in Figure 2-36.

tool, you might want to learn the XPath language, which is a W3C recommendation (defined at http:// www.w3.org/TR/xpath) designed for performing queries on XML data. NET provides XPath support through the classes in the System.Xml.XPath namespace, which include an XPath parser and evaluation engine. Of course, these aren t much use unless you learn the syntax of the XPath language. Another option is to use LINQ to XML, which is described in the Still More Ways to Read XML sidebar at the end of this chapter.

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