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So far, you have been working with a few simple methods on the object context and entity objects to perform selections, inserts, updates, and deletes. This is useful all by itself; however, EF becomes much more powerful when you incorporate LINQ queries. If you wish to use LINQ to update or delete records, you don t need to make an EntityKey object manually. Consider the following update to the RemoveRecord() method, which will not work as expected at this point: private static void RemoveRecord() {

It s also important to consider the type of data that works best in a profile. As with many other types of state management, you can store any serializable types into a profile, including simple types and custom classes.

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// Find a car to delete by primary key. using (AutoLotEntities context = new AutoLotEntities()) { // See if we have it var carToDelete = from c in context.Cars where c.CarID == 2222 select c; if (carToDelete != null) { context.DeleteObject(carToDelete); context.SaveChanges(); } } } This code compiles, but you will receive a runtime exception when you attempt to call the DeleteObject() method. The reason: This particular LINQ query returns an ObjectQuery<T> object, not a Car object. Always remember that when you build a LINQ query that attempts to locate a single entity, you will get back an ObjectQuery<T> representing a query that is capable of bringing back the data you are looking for. To execute the query (and bring back the Car entity), you must execute a method such as FirstOrDefault() on the query object, as in the following example: var carToDelete = (from c in context.Cars where c.CarID == 2222 select c).FirstOrDefault(); By calling FirstOrDefault() on the ObjectQuery<T>, you find the item you want; or, if there is no Car with the ID of 2222, a default value of null. Given that you have already worked with many LINQ expressions in 13, a few more examples will suffice for the time being: private static void FunWithLINQQueries() { using (AutoLotEntities context = new AutoLotEntities()) { // Get a projection of new data. var colorsMakes = from item in context.Cars select new { item.Color, item.Make }; foreach (var item in colorsMakes) { Console.WriteLine(item); } // Get only items where CarID < 1000 var idsLessThan1000 = from item in context.Cars where item.CarID < 1000 select item; foreach (var item in idsLessThan1000) { Console.WriteLine(item); } } }

One significant difference between profiles and other types of state management is that profiles are stored as individual records, each of which is uniquely identified by user name. This means that profiles require you to use some sort of authentication system. It makes no difference what type of authentication system you use (Windows, forms, or a custom authentication system) the only requirement is that authenticated users are assigned a unique user name. That user name is used to find the matching profile record in the database.

The hibernate.cfg.xml file will contain all mapping classes like the following: < xml version="1.0" encoding="utf-8" > <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory name="sessionFactory"> <mapping class="com.apress.flexjava.usermanager.model.User" /> </session-factory> </hibernate-configuration> I prefer this configuration as it is better to have all your mapped classes in a separate file, in order to keep the main configuration file clean. In the next chapter, we will see how to separate the XML configuration for the different services into different configuration files, to avoid having just one big application file. For example, we will move all our DAOs beans into a configuration file called application-dao.xml, and so on. Later on, we will focus more on annotations, as well making the XML file configurations much lighter and readable. Now I m going to discuss how to map your database objects to your Java domain objects using XML. Even though all our example applications will use annotations, it s still important to become familiar with this method because it is used by a lot of applications.

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