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Listing 12-1. A Simple Example Updating the ContactName of a Customer in the Northwind Database // Create a DataContext. Northwind db = new Northwind(@"Data Source=.\SQLEXPRESS;Initial Catalog=Northwind"); // Retrieve customer LAZYK. Customer cust = (from c in db.Customers where c.CustomerID == "LAZYK" select c).Single<Customer>(); // Update the contact name. cust.ContactName = "Ned Plimpton"; try { // Save the changes. db.SubmitChanges(); } // Detect concurrency conflicts. catch (ChangeConflictException) { // Resolve conflicts. db.ChangeConflicts.ResolveAll(RefreshMode.KeepChanges); }

s Note Use the ResponseWriter s startElement() and endElement() methods. This will improve your performance, make your code more portable between markup languages that have only subtle differences (for example, between HTML and XHTML), and make it easier to detect and debug the generated markup by verifying that all startElement() and endElement() calls are balanced.

public static T Field ( this DataRow first, int ordinal, System.Data.DataRowVersion version); The fourth prototype returns the column s current value only for the DataColumn specified.

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In Listing 12-1, I used LINQ to SQL to query the record whose CustomerID field is "LAZYK" from the Northwind database Customers table and to return a Customer object representing that record. I then updated the Customer object s ContactName property and saved the change to the Northwind database by calling the SubmitChanges method. That s not much code considering it is also detecting concurrency conflicts and resolving them if they occur. Run Listing 12-1 by pressing Ctrl+F5. There is no console output, but if you check the database, you should see that the ContactName for customer LAZYK is now "Ned Plimpton".

public static T Field ( this DataRow first, System.Data.DataColumn column); The fifth prototype returns the column s current value only for the column with the specified name.

public static T Field ( this DataRow first, string columnName); The sixth prototype returns the column s current value only for the column with the specified ordinal.

This example makes a change to the data in the database without changing it back. The original value of the ContactName for customer LAZYK is "John Steel". You should change this back so that no subsequent examples behave improperly. You could change it manually, or you could just change the example code to set it back, and run the example again.

The JavaScript Implementation Before you continue with encoding the children of the UIShowOne component, take a closer look at the new JavaScript file, showOneDeck.js, as shown in Code Sample 3-20. You can see only one function in this file, showOneDeck(); it takes three arguments: The formClientId argument represents the clientId of the parent UIForm component. The showOneClientId argument represents the clientId of the containing UIShowOne component. The itemId argument is the node selected by the user.

public static T Field ( this DataRow first, int ordinal); As you may have noticed, the first three prototypes allow you to specify which DataRowVersion of the DataColumn object s value you want to retrieve.

This book uses an extended version of the Northwind database. Please read the section in this chapter titled Obtaining the Appropriate Version of the Northwind Database for details.

At this point, you have seen the Field<T> operator called many times and in different ways. But just so you can see each prototype in action, Listing 10-12 shows a trivial example of each.

Later in the encodeChildren() method, you will see how you attach this JavaScript function to the generated HTML and pass these values to it Using a JavaScript function, you can respond to user actions and trigger a postback to the FacesServlet by submitting the form Code Sample 3-20 The Source of the showOneDeckjs File /** * The onclick handler for HtmlShowOneDeckRenderer * * @param formClientId the clientId of the enclosing UIForm component * @param clientId the clientId of the ProShowOneDeck component * @param itemId the id of the UIShowItem that was clicked */ function _showOneDeck_click( formClientId, clientId, itemId) { var form = documentforms[formClientId]; var input = form[clientId]; if (!input) { input = documentcreateElement("input"); inputtype = 'hidden'; inputname = clientId; formappendChild(input); } inputvalue = itemId; form.

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