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In this chapter, we discuss the lifecycle of objects how an object becomes persistent, and how it stops being considered persistent and the method calls and other actions that trigger these transitions. The NHibernate persistence manager, the ISession, is responsible for managing object state, so you ll learn how to use this important API. Retrieving object graphs efficiently is another central concern, so we introduce the basic strategies in this chapter. NHibernate provides several ways to specify queries that return objects without losing much of the power inherent to SQL. Because network latency caused by remote access to the database can be an important limiting factor in the overall performance of .NET applications, you must learn how to retrieve a graph of objects with a minimal number of database hits. Let s start by discussing objects, their lifecycle, and the events that trigger a change of persistent state. These basics will give you the background you need when working with your object graph, so you ll know when and how to load and save your objects. The material may be rather formal, but a solid understanding of the persistence lifecycle will greatly help you in your application development with NHibernate.

Because NHibernate is a transparent persistence mechanism, classes are unaware of their own persistence capability. It s therefore possible to write application logic that is unaware of whether the objects it operates on represent persistent state or temporary state that exists only in memory. The application shouldn t necessarily need to care that an object is persistent when invoking its methods. But in any application with persistent state, the application must interact with the persistence layer whenever it needs to transmit state held in memory to the database (or vice versa). To do this, you call NHibernate s persistence API. When interacting with the persistence mechanism that way, it s necessary for the application to concern itself with the state and lifecycle of an object with respect to persistence. We ll refer to this as the persistence lifecycle. Different ORM implementations use different terminology and define different states and state transitions for the persistence lifecycle. Moreover, the new Transient object states used internally may be Get() Save() different from those exposed to the garbage Load() Delete() SaveOrUpdate() Find() client application. NHibernate Enumerable() defines only three states, hiding the etc. Persistent complexity of its internal implemenEvict() Update() tation from the client code. In this Close() * SaveOrUpdate() Clear() * garbage Lock() section, we explain these three states: transient, persistent, and detached. Detached Figure 4.1 shows these states and * affects all instances in a Session their transitions in a state chart. You can also see the method calls to the Figure 4.1 States of an object and transitions in an persistence manager that trigger NHibernate application

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4. Make a backup copy of the RSReportDesigner.config file in the C:\Program Files \Microsoft Visual Studio 8\Common7\IDE\PrivateAssemblies folder, and then edit the RSReportDesigner.config file, adding the following code as a child to the <Data> element:

transitions. We discuss this chart in this section; refer to it later whenever you need an overview. In its lifecycle, an object can transition from a transient object to a persistent object to a detached object. Let s take a closer look at each of these states.

When using NHibernate, simply creating objects using the new operator will not make them immediately persistent. At this point, their state is transient, which means they aren t associated with any database table row. This is similar to any other object in a .NET application. As you would expect, their state is lost as soon as they re dereferenced (no longer referenced by any other object) and they become inaccessible and available for garbage collection. NHibernate considers all transient instances to be nontransactional; a modification to the state of a transient instance isn t made in the context of any transaction. This means NHibernate doesn t provide any rollback functionality for transient objects. In fact, NHibernate doesn t roll back any object changes, as you ll see later. Objects that are referenced only by other transient instances are, by default, also transient. To transition an object from transient to persistent state, there are two choices. You can Save() it using the persistence manager, or create a reference to it from an already-persistent instance and take advantage of transitive persistence (section 4.3).

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