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When you use LINQ to Entities or Entity SQL, the fetched data is mapped back to your entity classes automatically, thanks to the entity client service. Typically this is exactly what you require; however, you can intercept the result set before it makes its way to your entity objects and process it manually using the EntityDataReader. Here is a final helper method for this example, which uses several members of the System.Data.EntityClient namespace to build a connection manually through a command object and data reader. This code should look familiar due to your previous work in 21; the major difference is that you use Entity SQL, rather than normal SQL: private static void FunWithEntityDataReader() { // Make a connection object, based on our *.config file. using (EntityConnection cn = new EntityConnection("name=AutoLotEntities")) { cn.Open(); // Now build an Entity SQL query. string query = "SELECT VALUE car FROM AutoLotEntities.Cars AS car"; // Create a command object. using (EntityCommand cmd = cn.CreateCommand()) { cmd.CommandText = query; // Finally, get the data reader and process records. using (EntityDataReader dr = cmd.ExecuteReader(CommandBehavior.SequentialAccess)) { while (dr.Read()) { Console.WriteLine("***** RECORD *****"); Console.WriteLine("ID: {0}", dr["CarID"]); Console.WriteLine("Make: {0}", dr["Make"]); Console.WriteLine("Color: {0}", dr["Color"]); Console.WriteLine("Pet Name: {0}", dr["CarNickname"]); Console.WriteLine(); } }

Using XML-based configuration is not efficient very because, for each entity class that you want to map, you have to create an XML file that tells Hibernate which database object is mapped to each Java domain class Then you have to inject each file into the sessionFactory To use the XML configuration, you have to create an instance of the Spring class LocalSessionFactoryBean belonging to the package orgspringframeworkormhibernate3 As discussed, you must have an XML file for each mapping class For example if you have a database with three tables like users, orders, groups, and you want to map just the tables users and groups, you will need two XML files that tell Hibernate where to find the related Java classes for each database object you want to map.

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As a rule of thumb, use a profile to store only the same sort of information you d place in the user table. Don t use it to store related data that you d place in separate tables.

} } } Great! This initial example should go a long way toward helping you understand the nuts and bolts of working with the Entity Framework. As mentioned previously, things become much more interesting when your EDM contains interrelated tables, which you will learn about next.

Next, you will learn how to build an EDM that captures the bulk of the AutoLot database, including your GetPetName stored procedure. I strongly suggest that you make a copy of the AutoLotDAL (Version 3) project you created in 22 and rename this copy to AutoLotDAL (Version 4). Open the latest version of the AutoLotDAL project in Visual Studio 2010 and insert a new ADO.NET Entity Data Model project item named AutoLotDAL_EF.edmx. On step three of the wizard, you should select the Inventory, Orders, and Customers tables (there s no need to nab the CreditRisks table at this time), as well as the custom stored procedure (see Figure 23-17).

The standard profiles provider that s included with ASP .NET (named SqlProfileProvider) doesn t provide many additional features. The following list includes some features that you can easily add through a custom database component but aren t available if you re using the SqlProfileProvider. If you need any of these features, you ll need to abandon profiles and create your own data access component, or you ll need to design a custom profiles provider. Encryption: Profile data can be serialized into a string, XML, or a binary representation. But no matter what you choose, you ll always end up storing the raw text. If you have sensitive information, your only option is to encrypt it manually before you store it, which has the undesirable result of putting encryption logic in your user interface code. Validation: You can t restrict the type of information that can be placed in a profile. You need to use other tools (such as validator controls and custom data classes) to prevent invalid data. Caching: If profile information is used in a page, it s always retrieved from the database. You can t keep profile information around in memory. Although you can copy profile information into the cache, it becomes more difficult to track this information. Auditing: When you design a custom database component, you have the ability to add any logging or tracing code you want. You can use this to diagnose unexpected errors or monitor the performance of your web application. However, if you want these features with profiles, you ll need to build a custom profiles provider that has the logging code. Now that you know the ins and outs of profiles, you re ready to try them.

In contrast to the first EDM example, this time you don t bother renaming your entity class names or their properties.

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