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Figure 15-16. The DataSet family of objects You fill the DataSet in much the same way that you connect a DataReader. However, although the DataReader holds a live connection, information in the DataSet is always disconnected. The following example shows how you could rewrite the FillAuthorList() method from the earlier example to use a DataSet instead of a DataReader. The changes are highlighted in bold. private void FillAuthorList() { lstAuthor.Items.Clear(); // Define ADO.NET objects. string selectSQL; selectSQL = "SELECT au_lname, au_fname, au_id FROM Authors"; SqlConnection con = new SqlConnection(connectionString); SqlCommand cmd = new SqlCommand(selectSQL, con);

SqlDataAdapter adapter = new SqlDataAdapter(cmd); DataSet dsPubs = new DataSet(); // Try to open database and read information. try { con.Open(); // All the information in transferred with one command. // This command creates a new DataTable (named Authors) // inside the DataSet. adapter.Fill(dsPubs, "Authors"); } catch (Exception err) { lblStatus.Text = "Error reading list of names. "; lblStatus.Text += err.Message; } finally { con.Close(); } foreach (DataRow row in dsPubs.Tables["Authors"].Rows) { ListItem newItem = new ListItem(); newItem.Text = row["au_lname"] + ", " + row["au_fname"]; newItem.Value = row["au_id"].ToString(); lstAuthor.Items.Add(newItem); } } If you want to extract records from a database and place them in a DataSet, you need to use a DataAdapter. Every DataAdapter can hold four commands: SelectCommand, InsertCommand, UpdateCommand, and DeleteCommand. This allows you to use a single DataAdapter object for multiple tasks. The Command object supplied in the constructor is automatically assigned to the DataAdapter.SelectCommand property. Figure 15-17 shows how the DataAdapter interacts with your web application. The DataAdapter.Fill() method takes a DataSet and inserts one table of information. In this case, the table is named Authors, but any name could be used. That name is used later to access the appropriate table in the DataSet. To access the individual DataRows, you can loop through the Rows collection of the appropriate table. Each piece of information is accessed using the field name, as it was with the DataReader.

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app/models/ test/unit/ test/fixtures/ app/models/project.rb test/unit/project_test.rb test/fixtures/project.yml db/migrate db/migrate/003_create_projects.rb

When Venkman is open, it recognizes all the JavaScript that is available to the page currently open in the browser window. Venkman recognizes JavaScript that is embedded within the HTML page using <script> tags and also recognizes external JavaScript files that are included in the HTML page using <script src="js_file.js"> tags.

A DataSet can contain as many tables as you need, and you can even add relationships between the tables to better emulate the underlying relational data source. Unfortunately, you have no way to connect tables together automatically based on relationships in the underlying data source. However, you can add relations with a few extra lines of code, as shown in the next example. In the pubs database, authors are linked to titles using three tables. This arrangement (called a many-to-many relationship, shown in Figure 15-18) allows several authors to be related to one title and several titles to be related to one author. Without the intermediate TitleAuthor table, the database would be restricted to a one-to-many relationship, which would allow only a single author for each title. In an application, you would rarely need to access these tables individually. Instead, you would need to combine information from them in some way (for example, to find out what author wrote a given book). On its own, the Titles table indicates only the author ID. It doesn t provide additional information such as the author s name and address. To link this information together, you can use a special SQL Select statement called a Join query. Alternatively, you can use the features built into ADO.NET, as demonstrated in this section.

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