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1. Select the first record from the Author table. 2. Using the Authors_TitleAuthor relationship, find the child records that correspond to this author. This step uses the GetChildRows method of the DataRow. 3. For each matching record in TitleAuthor, look up the corresponding Title record to get the full text title. This step uses the GetParentRows method of the DataRow. 4. Move to the next Author record, and repeat the process. The code is lean and economical: foreach (DataRow rowAuthor in dsPubs.Tables["Authors"].Rows) { lblList.Text += "<br /><b>" + rowAuthor["au_fname"]; lblList.Text += " " + rowAuthor["au_lname"] + "</b><br />"; foreach (DataRow rowTitleAuthor in rowAuthor.GetChildRows(Authors_TitleAuthor)) { foreach (DataRow rowTitle in rowTitleAuthor.GetParentRows(Titles_TitleAuthor)) { lblList.Text += "  "; lblList.Text += rowTitle["title"] + "<br />"; } } } Figure 15-19 shows the final result. If authors and titles have a simple one-to-many relationship, you could leave out the inner foreach statement and use simpler code, as follows: foreach (DataRow rowAuthor in dsPubs.Tables["Authors"].Rows) { // Display author. foreach (DataRow rowTitle in rowAuthor.GetChildRows(Authors_Titles)) { // Display title. } } Having seen the more complicated example, you re ready to create and manage multiple DataRelation objects on your own.

The Source Code pane lists the source code for the currently open file. The file could be an HTML file, XHTML file, or JavaScript file. The Source Code pane implements a tabbed theme so multiple files can be opened at once with each file residing in its own tab. The code has some simple colorization that improves readability. JavaScript keywords such as function and var have bold formatting, and string literals have a different colored font. On the left side of the pane is the line numbering for the file. The far-left side of the Source Code pane is the gutter on which debugging breakpoints can be set.

s Note Using a DataRelation implies certain restrictions. For example, if you try to create a child row that

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Each of these commands creates a number of files. You now have files named after the tables in the app/models directory, and those are the files you will edit. The generate model command also creates unit tests and fixtures, as well as a migration for each table. You can safely delete the migrations, since you already created all of the tables in your initial migration. The unit test and fixture files are for unit testing; visit the Rails site (http://rubyonrails.org) for information about their use. First, edit the app/models/actor.rb file so it looks like Listing 5-4.

refers to a nonexistent parent, ADO.NET will generate an error. Similarly, you can t delete a parent that has linked children records. These restrictions are already enforced by the data source, but by adding them to the DataSet, you ensure that they will be enforced by ADO.NET as well. This technique can allow you to catch errors as soon as they occur rather than waiting until you attempt to commit changes to the data source.

The third constructor is particularly useful for component programming. It allows you to set the InnerException property with the exception object that caused the original problem. The next example shows how you could use this constructor with a component class called ArithmeticUtility: public class ArithmeticUtilityException : ApplicationException { public ArithmeticUtilityException() : base() {} public ArithmeticUtilityException(string message) : base(message) {} public ArithmeticUtilityException(string message, Exception inner) : base(message, inner) {} } public class ArithmeticUtility { private decimal Divide(decimal number, decimal divisor) { try { return number/divisor; } catch (Exception err) { // Create an instance of the specialized exception class, // and place the original error in the InnerException property. ArithmeticUtilityException errNew = new ArithmeticUtilityException("Divide by zero", err); // Now throw the new exception. throw errNew; } } } Remember, custom exception classes are really just a standardized way for one class to communicate an error to a different portion of code. If you aren t using components or your own utility classes, you probably don t need to create custom exception classes.

In many cases, it s best not only to detect and catch exceptions but to log them as well. For example, some problems may occur only when your web server is dealing with a particularly large load. Other problems might recur intermittently, with no obvious causes. To diagnose

Listing 5-4. Actor Model (app/models/actor.rb)

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