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Different ORM solutions use different terminology and define different states and state transitions for the persistence lifecycle. Moreover, the object states used internally may be different from those exposed to the client application. Hibernate defines only four states, hiding the complexity of its internal implementation from the client code. The object states defined by Hibernate and their transitions in a state chart are shown in figure 9.1. You can also see the method calls to the persistence manager API that trigger transitions. This API in Hibernate is the Session. We discuss this chart in this chapter; refer to it whenever you need an overview. We ve also included the states of Java Persistence entity instances in figure 9.1. As you can see, they re almost equivalent to Hibernate s, and most methods of the Session have a counterpart on the EntityManager API (shown in italics). We say that Hibernate is a superset of the functionality provided by the subset standardized in Java Persistence. Some methods are available on both APIs; for example, the Session has a persist() operation with the same semantics as the EntityManager s counterpart. Others, like load() and getReference(), also share semantics, with a different method name. During its life, an object can transition from a transient object to a persistent object to a detached object. Let s explore the states and transitions in more detail.

Expanding on the data access technologies reviewed in the last lesson, this lesson will cover designing connections between SQL Server and heterogeneous clients. It will also cover what needs to be done to connect to XML Web services and another instance of a SQL Server service.

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Transient objects Objects instantiated using the new operator aren t immediately persistent. Their state is transient, which means they aren t associated with any database table row and so their state is lost as soon as they re no longer referenced by any other object. These objects have a lifespan that effectively ends at that time, and they become inaccessible and available for garbage collection. Java Persistence doesn t include a term for this state; entity objects you just instantiated are new. We ll continue to refer to them as transient to emphasize the potential for these instances to become managed by a persistence service. Hibernate and Java Persistence consider all transient instances to be nontransactional; any modification of a transient instance isn t known to a persistence context. This means that Hibernate doesn t provide any roll-back functionality for transient objects. Objects that are referenced only by other transient instances are, by default, also transient. For an instance to transition from transient to persistent state, to become managed, requires either a call to the persistence manager or the creation of a reference from an already persistent instance. Persistent objects A persistent instance is an entity instance with a database identity, as defined in chapter 4, section 4.2, Mapping entities with identity. That means a persistent and

Figure 4-1

Not all computers that connect to your SQL Server service will be using a Windows operating system. It is not uncommon to have some users in your enterprise using other platforms, such as UNIX or Linux. However, non-Windows users can still connect to your SQL Server service through HTTP endpoints.

managed instance has a primary key value set as its database identifier (There are some variations to when this identifier is assigned to a persistent instance) Persistent instances may be objects instantiated by the application and then made persistent by calling one of the methods on the persistence manager They may even be objects that became persistent when a reference was created from another persistent object that is already managed Alternatively, a persistent instance may be an instance retrieved from the database by execution of a query, by an identifier lookup, or by navigating the object graph starting from another persistent instance Persistent instances are always associated with a persistence context Hibernate caches them and can detect whether they have been modified by the application There is much more to be said about this state and how an instance is managed in a persistence context.

We ll get back to this later in this chapter Removed objects You can delete an entity instance in several ways: For example, you can remove it with an explicit operation of the persistence manager It may also become available for deletion if you remove all references to it, a feature available only in Hibernate or in Java Persistence with a Hibernate extension setting (orphan deletion for entities) An object is in the removed state if it has been scheduled for deletion at the end of a unit of work, but it s still managed by the persistence context until the unit of work completes In other words, a removed object shouldn t be reused because it will be deleted from the database as soon as the unit of work completes.

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