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Although this approach gives you the flexibility to store just about any type of data, it makes it more difficult to use this data in other applications You can write custom code to parse the profile data in order to find the information you want, but depending on the amount of data and the data types you re using, this can be an extremely tedious process And even if you do this, you re still limited in the ways you can reuse this information For example, imagine you use profiles to store customer address information Because of the proprietary format, it s no longer possible to generate customer lists in an application such as Microsoft Word or perform queries that filter or sort records using this profile data (For example, you can t easily perform a query to get all the customers living in a specific city.

constructor argument is the value of the primary key. Once you find the object in question, you can call DeleteObject() off your context and save the changes.

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Now that you have set the hibernate dialect, you must provide the Maven Hibernate 3 plug-in with the connection details; otherwise, you will get an error when you run or build the application using Maven. I will add the parameters needed by the Hibernate3 Maven plug-in in the jdbc.properties file, and I will use the same JDBC connection details defined in the POM. Here is the code that you have to add to the jdbc.properties file after the hibernate.dialect definition: # Needed by Hibernate3 Maven Plugin defined in pom.xml hibernate.connection.username=${jdbc.username} hibernate.connection.password=${jdbc.password} hibernate.connection.url=${jdbc.url} hibernate.connection.driver_class=${jdbc.driverClassName} The next example shows getting the list of mapping classes from an external configuration file. The following in bold is the external file where I define the mapping classes: <bean id="sessionFactory" class="org.springframework.orm.hibernate3 .annotation.AnnotationSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <property name="configLocation" value="classpath:hibernate.cfg.xml"/> <property name="hibernateProperties"> <value> hibernate.dialect= =${hibernate.dialect} hibernate.query.substitutions=true 'Y', false 'N' hibernate.cache.use_second_level_cache=true hibernate.cache.provider_class=org.hibernate.cache.EhCacheProvider hibernate.hbm2ddl.auto=update hibernate.use_sql_comments=true hibernate.show_sql=true </value> </property> </bean> As you can see in the property named configLocation, there is a reference to an XML file called hibernate.cfg.xml placed into the classpath. Figure 5-11 shows the location of this file.

) This problem has two solutions: Use custom data access components instead of profiles to store and retrieve data in a database Create a custom profiles provider that s designed to store information using your database schema Out of the two options, creating a custom data access component is easier, and it gives you more flexibility You can design your data component to have any interface you want, and you can then reuse that component with other NET applications Currently, ASPNET developers are more likely to use this approach because it has been around since NET 10 and is well understood The second option is interesting because it allows your page to keep using the profile model In fact, you could create an application that uses the standard profile serialization with the SqlProfileProvider and then switch it later to use a custom provider.

Updating a record is also straightforward; locate the object you wish to change, set new property values on the returned entity, and save the changes: private static void UpdateRecord() { // Find a car to delete by primary key. using (AutoLotEntities context = new AutoLotEntities()) { // Define a key for the entity we are looking for. EntityKey key = new EntityKey("AutoLotEntities.Cars", "CarID", 2222); // Grab the car, change it, save! Car carToUpdate = (Car)context.GetObjectByKey(key); if (carToUpdate != null) { carToUpdate.Color = "Blue"; context.SaveChanges(); } } } The preceding method might seem a bit off, at least until you remember that the entity object returned from GetObjectByKey() is a reference to an existing object in the ObjectSet<T> field. Thus, when you set properties to change the state, you are changing the same object in memory.

To make this switch, you don t need to change any code Instead, you simply modify the profile settings in the webconfig file As it becomes more common for websites to use profiles, custom profiles providers will become more attractive..

Note Much like an ADO.NET DataRow object (see 22), any descendent of EntityObject (meaning, all of your entity classes) has a property named EntityState, which is used by the object context to determine whether the item has been modified, deleted, is detached, and so forth. This is set on your behalf as you work with the programming model; however, you can change this manually as required.

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