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You may want to not allow the deletion if the data has changed By creating a slightly more complex DELETE query, you can prevent any deletions from occurring if the Player has changed We ll look at concurrency issues such as this in 12 Checks for the number of rows deleted: You don t actually check that you re deleting the correct number of rows from the table From the Web site s design, you know that if you delete a Player, you should affect only one row in the Player table You could also check that this is true by looking at the number of rows affected returned from ExecuteNonQuery() However, when executing a query batch, as you do here, the rows affected are the sum of all of the queries that are executed, so you couldn t use this value at the moment.

In the following sections, you ll learn about two tasks that use these properties redirecting the user to a new page, and encoding text that may contain special characters so it can be inserted into web page HTML.

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p until now in this book, we have looked at various techniques of using Ajax (that is, the XMLHttpRequest object with the help of Prototype) to manipulate data in the web application we are developing Some examples of this include updating the HTML content on a web page dynamically, validating forms, and using JSON as a means to exchange data between the client and the server Although these techniques are very useful and somewhat straightforward to implement, they are not the only features that define a web site as being Web 20 In this chapter, we will look at some of the other features of Web 20, which include the following: Tags A tag is typically one or two words used to describe some arbitrary item Because a tag is usually very concise, it is used as a way to categorize said items.

You could split the two DELETE queries into separate calls to the database and ensure that the DELETE query against the Player table deleted only one row If it didn t, you would have an error (and if you were using a transaction, you could then abort the transaction and prevent the deletion from occurring) Deleting data is a relatively simple thing to do, but it s also the most final It s worth repeating that you need to be careful when implementing deletions..

In the currency converter example, everything took place in a single page In a more typical website, the user will need to surf from one page to another to perform different tasks or complete a single operation There are several ways to transfer a user from one page to another One of the simplest is to use an ordinary <a> anchor element, which turns a portion of text into a hyperlink In this example, the word here is a link to another page: Click <a href="newpageaspx">here</a> to go to newpageaspx Another option is to send the user to a new page using code This approach is useful if you want to use your code to perform some other work before you redirect the user It s also handy if you need to use code to decide where to send the user.

One item can have multiple tags, and if used properly, one tag will belong to multiple items Web feeds A web feed is a stream of a web site s content provided by the site s owner in order to allow other publishers to display that data This is often done using the Atom or RSS standard, although other formats are available Microformats A microformat is a simple data format used to formally structure certain kinds of HTML data For instance, whenever you want to list a person s contact details on a web page, you would mark it up in HTML according to the hCard microformat (which we will look at later in this chapter).

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