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Listing 7-13. Filling a DataSet in C# private void buttonData_Click(object sender, EventArgs e) { string connectionString = "Data Source=(local);Initial Catalog=Test;Integrated Security=SSPI;"; using (SqlConnection testConnection = new SqlConnection(connectionString)) { SqlCommand testCommand = testConnection.CreateCommand(); testCommand.CommandText = "Select * from userTable; Select * from permissionsTable"; SqlDataAdapter dataAdapter = new SqlDataAdapter(testCommand); dataAdapter.Fill(myData); } // testConnection.Dispose called automatically. DisplayContents() ; } Listing 7-14. Filling a DataSet in Visual Basic .NET Private Sub buttonData_Click( _ ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles buttonData.Click Dim connectionString As String = _ "Data Source=(local);Initial Catalog=Test;Integrated Security=SSPI;" Using testConnection As SqlConnection = New SqlConnection(connectionString) Dim testCommand As SqlCommand = testConnection.CreateCommand() testCommand.CommandText = _ "Select * from userTable; Select * from permissionsTable" Dim dataAdapter As New SqlDataAdapter(testCommand) dataAdapter.Fill(myData) End Using ' testConnection.Dispose called automatically. DisplayContents() End Sub

This method causes the Active Record object to be saved, but it first runs all of the validations of the object. This method returns false if there are validation errors. This method overrides the default ActiveRecord::Base.save() method when the Validations module is mixed in, which is the default behavior of Active Record.

<div id="right-container" class="column"> <div class="box"> {if $authenticated} Logged in as {$identity->first_name|escape} {$identity->last_name|escape} (<a href="{geturl controller='account' action='logout'}">logout</a>). <a href="{geturl controller='account' action='details'}">Update details</a>. {else} You are not logged in. <a href="{geturl controller='account' action='login'}">Log in</a> or <a href="{geturl controller='account' action='register'}">register</a> now. {/if} </div> </div> <div id="footer"> Practical PHP Web 2.0 Applications, by Quentin Zervaas. </div> </body> </html>

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4. Similarly, in the click event handler for buttonSchema, add the code shown in Listings 7-15 and 7-16. Note that all you did was swap the Fill method call to FillSchema. The second parameter specified will be examined in further detail shortly, but for now it s enough to understand that the second parameter specifies the DataAdapter to use the table names as defined by the source, and not map them to something else (you can specify such mappings using the TableMappings property, but more on that in Exercise 7.6).

save_with_validation!()

If you haven t yet tried, you should be able to validate the generated markup with no warnings or errors Tip using the W3C validator at http://validator.w3.org. In fact, you could have done so prior to this chapter, as we are developing standards-compliant code. It is important when developing your CSS and templates to check the validity of both your HTML/XHTML and your CSS (using http://jigsaw.w3.org/css-validator), as it is easy to accidentally put something in your code that breaks the validation. Chris Pederick s Web Developer toolbar for Firefox (http://chrispederick.com/work/web-developer) has quick-access links to validate HTML and CSS code.

Listing 7-15. Filling a DataSet Schema in C# private void buttonSchema_Click(object sender, EventArgs e) { string connectionString = "Data Source=(local);Initial Catalog=Test;Integrated Security=SSPI;"; using (SqlConnection testConnection = new SqlConnection(connectionString)) { SqlCommand testCommand = testConnection.CreateCommand(); testCommand.CommandText = "Select * from userTable; Select * from permissionsTable"; SqlDataAdapter dataAdapter = new SqlDataAdapter(testCommand); dataAdapter.FillSchema(myData, SchemaType.Source); } // testConnection.Dispose called automatically. DisplayContents() ; } Listing 7-16. Filling a DataSet Schema in Visual Basic .NET Private Sub buttonSchema_Click( _ ByVal sender As System.Object, ByVal e As System.EventArgs) _ Handles buttonSchema.Click Dim connectionString As String = _ "Data Source=(local);Initial Catalog=Test;Integrated Security=SSPI;" Using testConnection As SqlConnection = New SqlConnection(connectionString) Dim testCommand As SqlCommand = testConnection.CreateCommand() testCommand.CommandText = _ "Select * from userTable; Select * from permissionsTable" Dim dataAdapter As New SqlDataAdapter(testCommand) dataAdapter.FillSchema(myData, SchemaType.Source) End Using ' testConnection.Dispose called automatically. DisplayContents() End Sub

Although the code we have just implemented works well and updates the page as it should, the only problem with it is that it doesn t give any feedback to the user. To fix this, we will use the messages container we created in 7 to notify the user that new content is being loaded.

5. You might have noticed a call to a method named DisplayContents at the end of both the Fill and FillSchema listings. That method is responsible for displaying the contents of the DataSet as XML in the xmlBrowser control. The code for that can be seen in Listings 7-17 and 7-18.

This method causes the Active Record object to be saved, but it first runs all of the validations of the object. If the save fails, the RecordInvalid exception is raised. This method overrides the default ActiveRecord::Base.save!() method when the Validations module is mixed in, which is the default behavior of Active Record.

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