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var query = from book in dataContext.GetTable<Book>() group book by book.SubjectId into groupedBooks orderby groupedBooks.Key select new { SubjectId = groupedBooks.Key, Books = groupedBooks }; foreach (var groupedBook in query) { Console.WriteLine("Subject: {0}", groupedBook.SubjectId); foreach (Book item in groupedBook.Books) { Console.WriteLine("Book: {0}", item.Title); } }

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Transactdemo creates c:\TransactionDemo.txt within a transaction that it has not committed. Open a second Command Prompt window, and use the dir command to look for the presence of the TransactionDemo.txt file: 1. 2. 3. 4. 5. C:\>dir transactiondemo.txt Volume in drive C is OS Volume Serial Number is 0C30-686E Directory of C:\ File Not Found

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Table 22-6.

The resulting object is an ordered collection of collections. To view the results, we need to iterate over both the grouped results and the contained collection of books for each grouping of subjects. This produces the following SQL:

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Call the SysCmd function to place a building table message on the status bar, and initialize a progress meter The CreateErrTable function will look at 32,767 different error codes Turn the mouse pointer into an hourglass to indicate that this procedure will take a few seconds Use the BeginTrans method of the Workspace object to start a transaction Statements within a transaction are treated as a single unit Changes to data are saved only if the transaction completes successfully with a CommitTrans method Using transactions when you re updating records can speed performance by reducing disk access Start a For loop to check each error code from 1 through 32,767 Assign the error text returned by the AccessError function to the variable varErrString Call the IsNothing function in the modUtility module of the sample database to test whether the text returned is blank.

You don t want blank rows, so don t add a row if the AccessError function for the current error code returns a blank string Lots of error codes are defined as Application-defined or object-defined error You don t want any of these, so this statement adds a row only if the AccessError function for the current error code doesn t return this string Use the AddNew method to start a new row in the table Set the ErrorCode field equal to the current error code Some error messages are very long You want to save only the first 255 characters, so set the ErrorString field equal to the first 255 characters of error text The text is stored in the varErrString variable Use the Update method to save the new row End If statement that completes the If statement on line 43.

End If statement that completes the If statement on line 42 After handling each error code, update the progress meter on the status bar to show how far you ve gotten Next statement that completes the For loop begun on line 40 Visual Basic increments lngErrCode by 1 and executes the For loop again until lngErrCode is greater than 32,767 CommitTrans method that completes the transaction begun on line 39 After looping through all possible error codes, close the recordset Clear the status bar Put the focus on the ErrTable table in the Database window Display a message box confirming that the function has completed End of the function Change the mouse pointer back to normal..

SELECT [t1].[SubjectId] AS [Key] FROM ( SELECT [t0].[Subject] AS [SubjectId] FROM [dbo].[Book] AS [t0] GROUP BY [t0].[Subject] ) AS [t1] ORDER BY [t1].[SubjectId]

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Note that this query only selects the key values. As we iterate over the results, separate queries are issued for each grouping. The resulting collection is contained in the groupedBooks object. While we have our results grouped, it would be nice if we could perform some aggregation on the values so that we can see counts, averages, and totals by the groupings.

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