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The two steps in bold (4 and 6) are the steps where the data source controls will spring into action: 1 The page object is created (based on the aspx file) 2 The page life cycle begins, and the PageInit and PageLoad events fire 3 All other control events fire 4 If the user is applying a change, the data source controls perform their update operations now If a row is being updated, the Updating and Updated events fire If a row is being inserted, the Inserting and Inserted events fire If a row is being deleted, the Deleting and Deleted events fire 5 The PagePreRender event fires 6 The data source controls perform their queries and insert the data they retrieve into the bound controls.

Once JSF has retrieved the view, the values from the request parameters (or cookie or header values) can be retrieved. During this phase, the component hierarchy is traversed, and the values are stored.

This step happens the first time your page is requested and every time the page is posted back, ensuring you always have the most up-to-date data The Selecting and Selected events fire at this point 7 The page is rendered and disposed In the rest of this chapter, you ll take a closer look at the SqlDataSource control, and you ll use it to build the record editor example demonstrated earlier with a lot less code..

Listing 5-9. Database Configuration File for the Graphical Report (config/database.yml)

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Data source controls turn up in the .aspx markup portion of your web page like ordinary controls. Here s an example: <asp:SqlDataSource ID="SqlDataSource1" runat="server" ... /> The SqlDataSource represents a database connection that uses an ADO.NET provider. However, this has a catch. The SqlDataSource needs a generic way to create the Connection, Command, and DataReader objects it requires. The only way this is possible is if your data provider includes something called a data provider factory. The factory has the responsibility

of creating the provider-specific objects that the SqlDataSource needs to access the data source. Fortunately, .NET includes a data provider factory for each of its four data providers: System.Data.SqlClient System.Data.OracleClient System.Data.OleDb System.Data.Odbc You can use all of these providers with the SqlDataSource. You choose your data source by setting the provider name. Here s a SqlDataSource that connects to a SQL Server database using the SQL Server provider: <asp:SqlDataSource ProviderName="System.Data.SqlClient" ... />

At this point, our data is converted using either the default converters or any special ones we ve built. Once our values have been converted, JSF will fire the validation associated with a given component again using either a built-in JSF validator or a custom one. If a validation fails, a message is added to the FacesContext, and JSF jumps to the Render Response phase, where the current view is redisplayed with the error messages (assuming the developer included a message component). If there are no validation errors, JSF moves on to the Update Model phase.

s Technically, you can omit this piece of information, because the System.Data.SqlClient provider Tip

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The next step is to supply the required connection string without it, you cannot make any connections. Although you can hard-code the connection string directly in the SqlDataSource tag, it s always better to keep it in the <connectionStrings> section of the web.config file to guarantee greater flexibility and ensure you won t inadvertently change the connection string. To refer to a connection string in your .aspx markup, you use a special syntax in this format: <%$ ConnectionStrings:[NameOfConnectionString] %> This looks like a data binding expression, but it s slightly different. (For one thing, it begins with the character sequence <%$ instead of <%#.) For example, if you have a connection string named Northwind in your web.config file that looks like this: <configuration> <connectionStrings> <add name="Northwind" connectionString= "Data Source=localhost\SQLEXPRESS;Initial Catalog=Northwind;Integrated Security=SSPI" /> </connectionStrings> ... </configuration> you would specify it in the SqlDataSource using this syntax: <asp:SqlDataSource ConnectionString="<%$ ConnectionStrings:Northwind %>" ... /> Once you ve specified the provider name and connection string, the next step is to add the query logic that the SqlDataSource will use when it connects to the database.

s If you want some help creating your connection string, select the SqlDataSource, open the Properties Tip

As in the previous example, you re creating only a development environment at this point, so you can safely ignore the other two database connection settings for testing and production. Place the code shown in Listing 5-10 in config/routes.rb.

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