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This is enough to build the first stage of the record editor example shown earlier namely, the drop-down list box that shows all the products. All you need to do is set the DataSourceID property to point to the SqlDataSource you ve created. The easiest way to do this is using the Properties window, which provides a drop-down list of all the data sources on your current web page. At the same time, make sure you set the DataTextField and DataValueField properties. Once you make these changes, you ll wind up with a control tag like this: <asp:DropDownList ID="lstProduct" runat="server" AutoPostBack="True" DataSourceID="sourceProducts" DataTextField="ProductName" DataValueField="ProductID" /> The best part about this example is that you don t need to write any code. When you run the page, the DropDownList control asks the SqlDataSource for the data it needs. At this point, the SqlDataSource executes the query you defined, fetches the information, and binds it to the DropDownList. The whole process unfolds automatically.

As you learned earlier in this chapter, you can bind to a DataReader or a DataSet So it s worth asking which approach does the SqlDataSource control use It s actually your choice, depending on whether you set the DataSourceMode to SqlDataSourceModeDataSet (the default) or to SqlDataSourceModeDataReader The DataSet mode is almost always better, because it supports advanced sorting, filtering, and caching settings that depend on the DataSet All these features are disabled in DataReader mode However, you can use the DataReader mode with extremely large grids, because it s more memory-efficient That s because the DataReader holds only one record in memory at a time just long enough to copy the record s information to the linked control.

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JSF is actually quite Ajax-friendly provided that you remember how elements are named. (See the earlier discussion on the name attribute in the JSF Taglibs section.) When it comes to talking to the server, we have a couple of options. First, we could go outside of the JSF life cycle completely by using a servlet or servlet Filter. Ajax is commonly used to fill in parts of the form based on previously entered data. To demonstrate this, let s fill in the Amount field based on the Pay to field by creating a Filter that will examine the value and return an appropriate amount. Our Filter might look something like Listing 8-14.

Another important fact to understand about the data source controls is that when you bind more than one control to the same data source, you cause the query to be executed multiple times For example, if two controls are bound to the same data source, the data source control performs its query twice once for each control This is somewhat inefficient after all, if you wrote the data binding code yourself by hand, you d probably choose to perform the query once and then bind the returned DataSet twice Fortunately, this design isn t quite as bad as it might seem First, you can avoid this multiple-query overhead using caching, which allows you to store the retrieved data in a temporary memory location where it will be reused automatically The SqlDataSource supports automatic caching if you set EnableCaching to true.

Listing 5-11. Home Controller for the Web Report (app/controllers/home_controller.rb)

26 provides a full discussion of how caching works and how you can use it with the SqlDataSource Second, contrary to what you might expect, most of the time you won t be binding more than one control to a data source That s because the rich data controls you ll learn about in 17 the GridView, DetailsView, and FormsView have the ability to present multiple.

pieces of data in a flexible layout. If you use these controls, you ll need to bind only one control, which allows you to steer clear of this limitation. It s also important to remember that data binding is performed at the end of your web page processing, just before the page is rendered. This means the Page.Load event will fire, followed by any control events, followed by the Page.PreRender event, and only then will the data binding take place. Data binding is performed on every postback (unless you redirect to another page).

class HomeController < ApplicationController def index @available_players =Player.find(:all) @available_games = Game.find(:all) end end

In the previous example (which used the SqlDataSource to retrieve a list of products), the complete query was hard-coded Often, you won t have this flexibility Instead, you ll want to retrieve a subset of data, such as all the products in a given category or all the employees in a specific city The record editor that you considered earlier offers an ideal example Once you select a product, you want to execute another command to get the full details for that product (You might just as easily execute another command to get records that are related to this product) To make this work, you need two data sources You ve already created the first SqlDataSource, which fetches limited information about every product.

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