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This tells the SqlDataSource to insert the text original_ before the field name to create the parameter that stores the old value Now your command will work as written The SqlDataSource doesn t raise an exception to notify you if no update is performed So, if you use the command shown in this example, you need to handle the SqlDataSourceUpdated event and check the SqlDataSourceStatusEventArgsAffectedRows property If it s 0, no records have been updated, and you should notify the user about the concurrency problem so the update can be attempted again, as shown here: Protected Sub sourceProductDetails_Updated(ByVal sender As Object, _ ByVal e As SqlDataSourceStatusEventArgs) Handles sourceProductDetailsUpdated If eAffectedRows = 0 Then lblInfoText = "No update was performed " & _ "A concurrency error is likely, or the command is incorrectly written" Else lblInfoText = "Record successfully updated.

Figure 16-10. Sorting the GridView Once you ve associated a sort expression with the column and set the AllowSorting property to true, the GridView will render the headers with clickable links, as shown in Figure 16-10. However, it s up to the data source control to implement the actual sorting logic. How the sorting is implemented depends on the data source you re using. Not all data sources support sorting, but the SqlDataSource does, provided the DataSourceMode property is set to DataSet (the default), not DataReader. In DataReader mode, the records are retrieved one at a time, and each record is stuffed into the bound control (such as a GridView) before the SqlDataSource moves to the next one. In DataSet mode, the entire results are placed in a DataSet and then the records are copied from the DataSet into the bound control. If the data needs to be sorted, the sorting happens between these two steps after the records are retrieved but before they re bound in the web page.

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" End If End Sub Figure 16-15 shows the result you ll get if you run two copies of this page in two separate browser windows, begin editing in both of them, and then try to commit both updates Matching every field is an acceptable approach for small records, but it isn t the most efficient strategy if you have tables with huge amounts of data In this situation, you have two possible solutions: you can match some of the fields (leaving out the ones with really big values) or you can add a timestamp field to your database table, and use that for concurrency checking..

The getTrace() method is very useful because each key in the array also contains the file, line, function name, and most important, all the arguments with which the function was called. Using the backtrace information, you can see all the upstream data that caused the problem, simplifying debugging. The getTrace() method is similar to the built-in function debug_backtrace(). Listing 4-1 demonstrates exception logic in the context of a database connection. Listing 4-1. Throwing an Exception While Connecting to a Database function connectToDatabase() { if(!$conn = pg_connect( )) { throw new Exception("Could not connect to the database"); } } try { connectToDatabase(); } catch(Exception $e) { echo $e->getMessage(); }

Note The sort is according to the data type of the column. Numeric and date columns are ordered from

Figure 16-15. A concurrency error in action Timestamps are special fields that the database uses to keep track of the state of a record. Whenever any change is made to a record, the database engine updates the timestamp field, giving it a new, automatically generated value. The purpose of a timestamp field is to make strict concurrency checking easier. When you attempt to perform an update to a table that includes a timestamp field, you use a Where clause that matches the appropriate unique ID value (like ProductID) and the timestamp field: UpdateCommand="UPDATE Products SET ProductName=@ProductName, UnitPrice=@UnitPrice, UnitsInStock=@UnitsInStock, UnitsOnOrder=@UnitsOnOrder, ReorderLevel=@ReorderLevel, Discontinued=@Discontinued WHERE ProductID=@ProductID AND RowTimestamp=@RowTimestamp" The database engine uses the ProductID to look up the matching record. Then, it attempts to match the timestamp in order to update the record. If the timestamp matches, you know the record hasn t been changed. The actual value of the timestamp isn t important, because that s controlled by the database. You just need to know whether it s changed. Creating a timestamp is easy. In SQL Server, you create a timestamp field using the timestamp data type. In other database products, timestamps are sometimes called row versions.

smallest to largest. String columns are sorted alphanumerically without regard to case. Columns that contain binary data cannot be sorted. However, if you click a column header twice, the second click reverses the sort order, putting the records in descending order. (Click a third time to switch it back to ascending order.)

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