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All the rich data controls include a DataKeyNames property This property indicates which field (or fields) are considered primary keys To use this feature, you must set the DataKeyNames property with a comma-separated list of one or more key fields Often, you ll have only one key field, as shown here: <asp:GridView ID="gridEmployees" runat="server" DataSourceID="sourceEmployees" DataKeyNames="EmployeeID" .. > Key fields are given special treatment For example, the GridView makes it possible to easily retrieve the key information for a given row Additionally, when you commit an update to a row, the data control passes the original value of the key fields, as well as the changed value (unless it s read-only) The original value is used in a WHERE clause to locate the row so you can perform the update To avoid confusion, the parameter that contains the original value is automatically given the prefix original_.

For example, the @EmployeeID parameter becomes @original_EmployeeID This difference can lead to a potential problem You may begin using a parameter name such as @EmployeeID and then set the DataKeyName property to get access to another feature, such as selection When you attempt to perform an update, you ll receive an error indicating the parameter @EmployeeID can t be found What makes this problem even more confusing is that you can take certain actions in Visual Studio such as refreshing the schema for your data control that will automatically set the DataKeyName property without warning you Now that you understand the problem, the solution is quite simple Most of the time you will use the DataKeyNames property, so you should modify your command to use the original value of any read-only primary keys.

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Here s an example: UpdateCommand="UPDATE Employees SET FirstName=@FirstName, LastName=@LastName, Title=@Title, City=@City FROM Employees WHERE EmployeeID=@original_EmployeeID"> This problem has another workaround The @original_ naming convention is configurable You can use a different prefix by changing the SqlDataSourceOldValuesParameterFormatString property This property takes a string of the form @original_{0}, where {0} indicates the unadulterated name If you are sure that your key values are read-only and won t be modified in an update operation, you have no reason to use this convention, because there s no difference between the original name and the current name So, simply change the OldValuesParameterFormatString property to {0}, and your commands will continue to work with the unmodified field names..

When working with certain types of data, it s sometimes quite expensive to construct a complex Python object to represent a given value. Worse yet, some parts of the application might not even use that object, even though the rest of the model might be necessary. Some examples of this in the real world are complex geographic representations or large trees of nested objects. In these cases, we must be able to get access to the full object when necessary, but it s very important for performance to not have that object constructed if it won t be used. Ideally, the data would be loaded from the database when the model is instantiated, but the raw value would just sit on the instance without being loaded into the full object. When the attribute is accessed, it would be constructed at that point, then cached so that subsequent accesses don t have to keep reconstructing the object. Looking back again to 2, descriptors are the perfect tool for this task, since they allow code to be run at the exact moment an attribute is accessed. Some care must be taken to make sure that the fully constructed object is cached properly for future use, but by using a separate and , this is also fairly straightforward.

The update command in the previous example matches the record based on its ID. The problem with this approach is that the update command updates every field indiscriminately it has no way to distinguish between fields that are and aren t changed. As a result, you can end up obliterating the changes of another user, if they are made between the time the page is requested and the time the page is updated. For example, imagine Chen and Lucy are viewing the same table of employee records. Lucy commits a change to the address of an employee. A few seconds later, Chen commits a name

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