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In the code generated by the Self-Tracking Entities T4 template, Entity Framework captures the original values of properties that are required in an update statement. These include the primary key and the columns that participate in concurrency. If your model uses independent associations, Entity Framework will keep track of the original foreign key values of the relationships because these are always part of the generated update statements. The end result of this approach is that when you update any property of a self-tracking entity on the client side, Entity Framework simply marks the entity as modified. This results in the update statement updating every column with all the property values, including the properties that did not change. Why is this the default behavior The Entity Framework development team found that in most cases sending less information over the wire and updating all columns was faster than sending the additional information about which properties changed. It is faster to send less information and do more work on the database side than send more information and do less work on the database side. Of course, this is true in most cases. If you happen to have a case in which updating all the columns is significantly more expensive than sending the additional information, you should consider making the changes illustrated in this recipe. With the changes we made to the templates, the self-tracking entity will grab the original values of just the properties that are modified along with the primary key and concurrency columns. When these are played back on the server side, only the changed properties are marked as modified. The resulting SQL update statement updates just the modified columns.

And here are the sorts of acceptance criteria that a customer would be thinking about:

Table 11-3 shows a number of ways you can provide a value for the author ID column of the following SelectCommand. The table samples are all different ways to provide a value for this parameterized SQL statement. SELECT * FROM authors WHERE (au_id = @au_id) Table 11-3. Parameter Sources, Syntax, and Meanings

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Most applications that use sophisticated database management systems like Microsoft s SQL Server are used by more than one person at a time. The concurrency concerns around shared access to simple data files is often the motivating reason developers turn to relational database systems to support their applications. Many, but not all, of the concurrency concerns evaporate when an application relies on a relational database for its data store. The concerns that remain usually involve detecting and controlling when an object state is different in memory than in the database. The recipes in this chapter provide an introduction to solving some of the problems typically faced by developers when it comes to detecting concurrency violations and controlling which copy of the object is ultimately persisted in the database.

This parameter enables you to pull a value from a named cookie. In this example, the cookie named "ID" will be passed to the select statement in place of the @au_id parameter in the statement. This parameter enables you to pull a named property from a control on the page. In this example, you re sending the selected value of the dropdown list control named ddlID as the @au_id value in the select statement. This parameter can be used when another page is sending values to your page via an HTTP Post. You can use this to pass named values from the HTTP Post header right into the SQL statement. Here, you re passing the ID post value into the @au_id parameter of the select statement. This parameter type enables you to pull values from the custom profile infrastructure provided in ASP .NET 2.0. You name any parameter configured as a property of the custom profile provider. Here you re moving the ID custom profile property into the @au_id value in the select statement.

Doug recently had one ICONIX training client (with a very complex domain model) report that he identified an additional 30% more domain classes just by writing one sentence definitions for the ones he had. That s a pretty good bang for the buck .

Let s suppose you have model like the one shown in Figure 14-1.

Figure 14-1. A Product entity describing products in your application The Product entity describes products in your application. You want to throw an exception if an intermediate update occurs between the time you retrieve a particular product entity and the time an update is performed in the database. To implement that behavior, do the following:

The query string parameter enables you to pull any value that was tacked on to the end of your URL with a named value pair. Here, you re passing the named query string value of id along into the @au_id parameter of the select command. You can also pull values from the ASP.NET Session object. Here, you re pulling the session value named id and using it as the value for the @au_id parameter of the select command.

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