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// Add the parameters. cmd.Parameters.AddWithValue("@au_fname", txtFirstName.Text); cmd.Parameters.AddWithValue("@au_lname", txtLastName.Text); cmd.Parameters.AddWithValue("@phone", txtPhone.Text); cmd.Parameters.AddWithValue("@address", txtAddress.Text); cmd.Parameters.AddWithValue("@city", txtCity.Text); cmd.Parameters.AddWithValue("@state", txtState.Text); cmd.Parameters.AddWithValue("@zip", txtZip.Text); cmd.Parameters.AddWithValue("@contract", Convert.ToInt16(chkContract.Checked)); cmd.Parameters.AddWithValue("@au_id_original", lstAuthor.SelectedItem.Value); // Try to open database and execute the update. int updated = 0; try { con.Open(); updated = cmd.ExecuteNonQuery(); lblStatus.Text = updated.ToString() + " record updated."; } catch (Exception err) { lblStatus.Text = "Error updating author. "; lblStatus.Text += err.Message; } finally { con.Close(); } // If the update succeeded, refresh the author list. if (updated > 0) { FillAuthorList(); } } The update code is similar to the code for inserting a record. The main differences are as follows: No DataReader is used, because no results are returned. A dynamically generated Update command is used for the Command object. This command finds the current author record in the database and changes all the fields to correspond to the values entered in the text boxes.

This example doesn t attempt to update the ID, because that detail can t be changed in the database. The ExecuteNonQuery() method returns the number of affected records. This information is displayed in a label to confirm to the user that the operation was successful. The FillAuthorList() method is then called to update the list, just in case the author s name information was changed.

You can run the SQL in Listing 5-3 and populate the database using the following command:

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When the user clicks the Delete button, the author information is removed from the database. The number of affected records is examined, and if the delete operation was successful, the FillAuthorList() function is called to refresh the page. protected void cmdDelete_Click(Object sender, EventArgs e) { // Define ADO.NET objects. string deleteSQL; deleteSQL = "DELETE FROM Authors "; deleteSQL += "WHERE au_id=@au_id"; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(deleteSQL, con); cmd.Parameters.AddWithValue("@au_id ", lstAuthor.SelectedItem.Value); // Try to open the database and delete the record. int deleted = 0; try { con.Open(); deleted = cmd.ExecuteNonQuery(); } catch (Exception err) { lblStatus.Text = "Error deleting author. "; lblStatus.Text += err.Message; } finally { con.Close(); } // If the delete succeeded, refresh the author list. if (deleted > 0) { FillAuthorList(); } }

Interestingly, delete operations rarely succeed with the records in the pubs database, because they have corresponding child records linked in another table of the pubs database. Specifically, each author can have one or more related book titles. Unless the author s records are removed from the TitleAuthor table first, the author cannot be deleted. Because of the careful error handling used in the previous example, this problem is faithfully reported in your application (see Figure 15-15) and doesn t cause any real problems.

Now that your Rails application has been created, your database connection is ready, and your database structure and data are prepared, you need to create code that accesses this database. First, let s create the models.

Venkman is available from www.mozilla.org/projects/venkman/. Venkman development started in April 2001 by Robert Ginda. Venkman is based on the Mozilla JavaScript debugging API known as js/jsd. The js/jsd API formed the basis of the Netscape JavaScript Debugger 1.1 that was available for the 4.x series of Netscape browsers. Once you ve installed it, you can start Venkman from the Tools JavaScript Debugger menu item from within Firefox. Figure 2-17 shows the default layout for Venkman. Venkman offers a plethora of information, divided into eight panes. The default layout consists of a large pane showing the selected source code. Smaller panes are arranged vertically on the left side of the window. Venkman s command-line interface resides on the bottom of the window under the Source Code pane.

Figure 15-15. A failed delete attempt To get around this limitation, you can use the Create New and Insert New buttons to add a new record and then delete this record. Because this new record won t be linked to any other records, its deletion will be allowed.

When you use disconnected data access, you keep a copy of your data in memory using the DataSet. You connect to the database just long enough to fetch your data and dump it into the DataSet, and then you disconnect immediately.

The models will represent your tables and the relationships between them. You can create the models using the following commands:

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