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Nontransacted writers, on the other hand, are prevented from opening the file by both transacted writers and transacted readers, so they cannot make changes to the file without being part of the transaction Nontransacted readers act similarly to transacted readers in that they see only the file contents that were last committed when the file handle was open Unlike transacted readers, however, they do not receive read-committed isolation, and as such they always receive the updated view of the latest committed version of a transacted file without having to open a new file handle This allows non-transaction-aware applications to behave as expected To summarize, TxF s read-committed isolation model has the following characteristics: Changes are isolated from transacted readers Changes are rolled back (undone) if the associated transaction is rolled back, if the machine crashes, or if the volume is forcibly dismounted.

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var query = from book in books where book.PubDate >= DateTime.Parse("1/1/2007") select book.PubDate.Value.ToString("MM/dd/yyyy");

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In this example, the translation provider is able to convert the DateTime.Parse method and insert a database-specific representation of the date. It is not able to handle the ToString method for formatting the data in the select clause. Identifying all of the supported and unsupported expressions that are translated is impossible. Additionally, translation support is dependent on the provider. When you re unsure whether a method is supported, try it out and see if it works. In many cases, filtering works as expected. In other cases, experimentation is necessary to find the proper method. We cannot cover all of the mappings here, but hopefully we have enough to get started. By allowing the filter to be applied on the server rather than the client, we can greatly reduce the amount of network bandwidth and take advantage of the database indexes. So far, we ve been able to rewrite our original query and objects to return only the desired fields and rows from our database while eliminating custom ADO.NET code. We re not quite back to the query that we started with, because we still need to utilize the server indexes for sorting our results. Let s continue to refine our query by adding sorting.

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53 54 55 rcdErrRecSet.Close ' Turn off the hourglass you're done DoCmd.Hourglass False ' And reset the status bar varReturnVal = SysCmd(acSysCmdClearStatus) ' Select new table in the Database window ' to refresh the list DoCmd.SelectObject acTable, "ErrTable", True ' Open a confirmation dialog box MsgBox "Errors table created." End Function

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If we needed to perform sorting functions manually, we d need to write a lot of custom code. LINQ to Objects allows us to simplify the query, but to truly utilize our database s power, we need to use the indexes that the database has defined. The query expressions orderby and orderby descending are designed to translate our sorting expression to the database. Consider the change we made to our running query by adding the sorting function, shown in listing 6.12.

Table 22-6 lists the statement line numbers and explains the code on each line in the preceding Visual Basic code example.

Table 22-6.

Declare the beginning of the function. The function has no arguments. You can begin a comment anywhere on a statement line by preceding the comment with a single quotation mark. You can also create a comment statement using the Rem statement. Declare local variables for a Database object, a TableDef object, a Field object, and an Index object. Declare local variables for a Recordset object, a Long Integer, and an Integer.

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var books = dataContext.GetTable<Book>(); var query = from book in books Add where book.Price < 30 sorting orderby book.Title select book.Title;

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Changes are flushed to disk if the associated transaction is committed eXPeriMeNT: understanding and Managing Transactions In this experiment we ll use the Transactdemoexe tool to create a new file, add some data to it as part of a transaction, and see how nontransacted clients interact with the file while the transaction is active First, open a Command Prompt window and run Transactdemoexe: 1 2 3 4 5 6 7 C:\>Transactdemoexe Transaction Demo v10 by Mark Russinovich Transaction created: {5CD5E900-9DA8-11DD-8379-005056C00008} Created C:\TransactionDemotxt Pass TransDemo the GUID listed above to see the transacted file Rollback or commit transaction (r/c):.

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