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This means you don t have to reattach (with update() or lock()) a detached instance to delete it from the database. In this case, the call to delete() does two things: It reattaches the object to the Session and then schedules the object for deletion, executed on tx.commit(). The state of the object after the delete() call is removed. Reattachment of detached objects is only one possible way to transport data between several Sessions. You can use another option to synchronize modifications to a detached instance with the database, through merging of its state. Merging the state of a detached object Merging of a detached object is an alternative approach. It can be complementary to or can replace reattachment. Merging was first introduced in Hibernate to deal with a particular case where reattachment was no longer sufficient (the old name for the merge() method in Hibernate 2.x was saveOrUpdateCopy()). Look at the following code, which tries to reattach a detached object:

using System; public class DotNetSearchClient { public static void Main(String[] args) {

item.getId(); // The database identity is "1234" item.setDescription(...); Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); Item item2 = (Item) session.get(Item.class, new Long(1234)); session.update(item); // Throws exception! tx.commit(); session.close();

SearchServiceService service=new SearchServiceService(); String lastTerm=service.getLastSearchTerm(); Console.WriteLine("last search = "+lastTerm); String[] results=service.search(args[0]); for(int i=0;i<results.Length;i++) { Console.WriteLine(results[i]); } } }

Given is a detached item object with the database identity 1234. After modifying it, you try to reattach it to a new Session. However, before reattachment, another instance that represents the same database row has already been loaded into the

persistence context of that Session. Obviously, the reattachment through update() clashes with this already persistent instance, and a NonUniqueObjectException is thrown. The error message of the exception is A persistent instance with the same database identifier is already associated with the Session! Hibernate can t decide which object represents the current state. You can resolve this situation by reattaching the item first; then, because the object is in persistent state, the retrieval of item2 is unnecessary. This is straightforward in a simple piece of code such as the example, but it may be impossible to refactor in a more sophisticated application. After all, a client sent the detached object to the persistence layer to have it managed, and the client may not (and shouldn t) be aware of the managed instances already in the persistence context. You can let Hibernate merge item and item2 automatically:

By comparing this to the Java client in section 15.5.3, you will see that there is almost no difference between the Java and the C# client; indeed, we used cut-and-paste to create the C# client. 15.7.4 Building the C# client Let s compile this code by using the <csc> task:

item.getId() // The database identity is "1234" item.setDescription(...); Session session= sessionFactory.openSession(); Transaction tx = session.beginTransaction(); Item item2 = (Item) session.get(Item.class, new Long(1234)); Item item3 = (Item) session.merge(item); (item == item2) // False (item == item3) // False (item2 == item3) // True return item3; tx.commit(); session.close();

<property name="out.app" location="${build.net.dir}/netclient.exe"/> <target name="build-dotnet" depends="import-dotnet" if="dotnetapps.found"> <copy toDir="${generated.net.dir}"> <fileset dir="${src.net.dir}" includes="**/*.cs" /> </copy>

The merge(item) call D results in several actions. First, Hibernate checks whether a persistent instance in the persistence context has the same database identifier as the detached instance you re merging. In this case, this is true: item and item2, which were loaded with get() C, have the same primary key value. If there is an equal persistent instance in the persistence context, Hibernate copies the state of the detached instance onto the persistent instance E. In other words, the new description that has been set on the detached item is also set on the persistent item2. If there is no equal persistent instance in the persistence context, Hibernate loads it from the database (effectively executing the same retrieval by identifier as you did with get()) and then merges the detached state with the retrieved object s state. This is shown in figure 9.10.

The <csc> task will compile all C# files in and below the srcDir directory, just as the <javac> task compiles Java source. Unlike <javac>, the output is not a directory tree full of object files. The task creates the executable, library, or DLL straight from the source files. The task does check dependencies, and rebuilds the target file if any of the input files have changed. One little irritant of the task is that you can only specify one source directory. This prevents us from building our handwritten source together with the generated source. To fix this, we have to copy our handwritten source to the generated directory , before running the build. A consequence of this is that when we click on any error line in an Ant hosting IDE, the IDE brings up the duplicate file, the one being compiled, not the master copy. We have to be very careful which file we are editing. We may enhance this task to support multiple source directories; as usual, check the documentation. 15.7.5 Running the C# client With the code compiled, it is time to run it, this time with <exec>: