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You can probably guess from the fact that we called something the hard way that we don t think it s a good technique We wouldn t use this approach in our own applications However, if your architecture specifies that the web tier should never access the domain model directly (and so the domain model is completely hidden from the presentation layer behind an intermediate DTO abstraction layer), and if you re unable to keep state associated with the user in the EJB tier (you re using only stateless session beans), then you have essentially no other choice It s possible to build Hibernate applications this way, and Hibernate was designed to support this approach At least this approach frees you from having to consider the difference between persistent and detached instances, and it eliminates the possibility of LazyInitializationExceptions thrown by detached objects.

The most basic form of set-based iteration isn t used to prevent exponential performance scaling, but to keep locking short and to prevent the transaction log from overflowing. This technique is often recommended in newsgroups when UPDATE or DELETE statements that affect a large number of rows have to be run. To prevent long-lasting locks, lock escalation, and transaction log overflow, the TOP clause is used (or SET ROWCOUNT on versions older than SQL Server 2005) to limit the number of rows processed in a single iteration, and the statement is repeated until no more rows are affected. An example is shown in listing 1, where transaction history predating the year 2005 is removed in chunks of 10,000 rows. (Note that this example, like all other examples in this chapter, should run on all versions from SQL Server 2005 upward.)

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Currently, most Hibernate applications choose the detached objects approach, with a new session per database transaction In particular, this is the method of choice for an application where business logic and data access execute in the EJB tier but where the domain model is also used in the web tier, avoiding the need for tedious DTOs This approach is even being used successfully in servlet-only applications We re inclined to think that it isn t the best approach for servlet-only applications, however Instead, we d use the long session approach in the case of a servlet-only application So far, we ve found this approach difficult to explain, and it isn t well understood in the Hibernate community.

/// <summary> /// The main entry point for the application. /// </summary> Creates a single-threaded [STAThread] apartment static void Main() { Application.Run(new Form1()); }

<idbag name="Images" lazy="true" table="ITEM_IMAGE" order-by="IMAGE_NAME asc"> <collection-id type="Int32" column="ITEM_IMAGE_ID"> <generator class="sequence"/> </collection-id> <key column="ITEM_ID"/> <composite-element class="Namespaces.Image, Assembly"> <property name="Name" column="IMAGE_NAME"/> <property name="Filename" column="FILENAME" not-null="true"/> <property name="SizeX" column="SIZEX"/> <property name="SizeY" column="SIZEY"/> </composite-element> </idbag>

We suppose this is because the notion of an application transaction isn t well understood in the Java community, and most developers aren t used to thinking about problems in terms of application transactions We hope this situation changes soon, because this idea is useful even if you don t use the long session approach If you want to use long sessions in an EJB application, you need to find a way to associate a Hibernate session with a particular user without leaving the EJB tier But should you be keeping state associated with users in the EJB tier at all This kind of practice is usually frowned on As far as we can see, there is no a priori reason why it should be less efficient to keep state associated with a user session in the business tier than in the web tier.

On the contrary, it looks as if it would be much more efficient to keep state associated with the application transaction right there in the middle tier where it belongs, rather than serializing it to and from the database and/or web tier in each request The EJB specification provides stateful session beans for precisely this purpose A stateful bean could store a Hibernate session in an instance variable, disconnecting the session between requests However, many application servers are.

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