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A persistent instance is any instance with a database identity, as defined in section 3.5. That means a persistent object has a primary key value set as its database identifier. Persistent instances might be objects instantiated by the application and then made persistent by calling the Save() method of the persistence manager (the NHibernate ISession, discussed in more detail later in this chapter). Persistent instances are then associated with the persistence manager. They might even be objects that became persistent when a reference was created from another persistent object already associated with a persistence manager. Alternatively, a persistent instance might 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. In other words, persistent instances are always associated with an ISession and are transactional. Persistent instances participate in transactions their state is synchronized with the database at the end of the transaction. When a transaction commits, state held in memory is propagated to the database by the execution of SQL INSERT, UPDATE, and DELETE statements. This procedure can also occur at other times. For example, NHibernate may synchronize with the database before execution of a query. This ensures that queries are aware of changes made earlier during the transaction. We call a persistent instance new if it has been allocated a primary key value but hasn t yet been inserted into the database. The new persistent instance will remain new until synchronization occurs.

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Of course, NHibernate doesn t have to update the database row of every persistent object in memory at the end of the transaction. Saving objects that haven t changed would be time consuming and unnecessary. ORM software must have a strategy for detecting which persistent objects have been modified by the application in the transaction. We call this automatic dirty checking (an object with modifications that haven t yet been propagated to the database is considered dirty). Again, this state isn t visible to the application. We call this feature transparent transaction-level write-behind, meaning that NHibernate propagates state changes to the database as late as possible but hides this detail from the application. NHibernate can detect exactly which attributes have been modified, so it s possible to include only the columns that need updating in the SQL UPDATE statement. This may bring performance gains, particularly with certain databases. But it isn t usually a significant difference; and, in theory, it could harm performance in some environments. So, by default, NHibernate includes all columns in the SQL UPDATE statement. NHibernate can generate and cache this basic SQL once at startup, rather than on the fly each time an object is saved. If you only want to update modified columns, you can enable dynamic SQL generation by setting dynamic-update="true" in a class mapping. Note that this feature is extremely difficult and time consuming to implement in a hand-coded persistence layer. We talk about NHibernate s transaction semantics and the synchronization process, or flushing, in more detail in the next chapter. Finally, you can make a persistent instance transient via a Delete() call to the persistence manager API, resulting in the deletion of the corresponding row of the database table.

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When a transaction completes and the data is written to the database, the persistent instances associated with the persistence manager still exist in memory. If the transaction was successful, the state of these instances has been synchronized with the database. In ORM implementations with process-scoped identity (see the following sections), the instances retain their association to the persistence manager and are still considered persistent. But in the case of NHibernate, these instances lose their association with the persistence manager when you Close() the ISession. Because they re no longer associated with a persistence manager, we refer to these objects as detached. Detached instances may no longer be guaranteed to be synchronized with database state; they re no longer under the management of NHibernate. But they still contain persistent data. It s possible, and common, for the application to retain a reference and update a detached object outside of a transaction and therefore without NHibernate tracking the changes. Fortunately, NHibernate lets you use these instances in a new transaction by reassociating them with a new persistence manager. After reassociation, they re considered persistent again. This feature has a deep impact on how multitiered applications may be designed. The ability to return objects from one transaction to the presentation

c# ean 13 reader

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