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Let s begin by reintroducing the core terms of JPA. A persistence unit is a named configuration of entity classes. A persistence context is a managed set of entity instances. Every persistence context is associated with a persistence unit, restricting the classes of the managed instances to the set defined by the persistence unit. Saying that an entity instance is managed means that it is contained within a persistence context and it can be acted upon by an entity manager. It is for this reason that we say that an entity manager manages a persistence context. Understanding the persistence context is the key to understanding the entity manager. An entity s inclusion or exclusion from a persistence context will determine the outcome of any persistent operations on it. If the persistence context participates in a transaction, the in-memory state of the managed entities will get synchronized to the database. Yet despite the important role that it plays, the persistence context is never actually visible to the application. It is always accessed indirectly through the entity manager and assumed to be there when we need it. So far so good, but how does the persistence context get created and when does this occur How does the entity manager figure in the equation This is where it starts to get interesting.

<bean id="datasource" class="org.springframework.jndi.JndiObjectFactoryBean"> <property name="jndiName" value="einsureDatasource" /> <property name="jndiEnvironment"> <props> <prop key="java.naming.factory.initial"> org.jnp.interfaces.NamingContextFactory </prop> <prop key="java.naming.provider.url"> jnp://localhost:1099 </prop> <prop key="java.naming.factory.url.pkgs"> org.jboss.naming.client </prop> </props> </property> </bean> </beans>

Up to this point, we have demonstrated only basic entity manager operations in both the Java SE and Java EE environments. We have reached a point, however, where we can finally reveal the full range of entity manager configurations. JPA defines no fewer than three different types of entity managers, each of which has a different approach to persistence context management that is tailored to a different application need. As we will see, the persistence context is just one part of the puzzle.

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In the Java EE environment, the most common way to acquire an entity manager is by using the @PersistenceContext annotation to inject one. An entity manager obtained in this way is called container-managed because the container manages the lifecycle of the entity manager, typically by proxying the one that it gets from the persistence provider. The application does not have to create it or close it. This is the style of entity manager we demonstrated in 3. Container-managed entity managers come in two varieties. The style of a container-managed entity manager determines how it works with persistence contexts. The first and most common style is called transaction-scoped. This means that the persistence contexts managed by the entity manager are scoped by the active JTA transaction, ending when the transaction is complete. The second style is called extended. Extended entity managers work with a single persistence context that is tied to the lifecycle of a stateful session bean and are scoped to the life of that stateful session bean, potentially spanning multiple transactions.

Behind the scenes, Hibernate inspects the example object and constructs an SQL fragment that corresponds to the properties on the example To use QBE, we need to construct an example object first Then we need to create an instance of the Example object, using the static create() method on the Example class The create() method takes the example object as its argument You add the Example object to a criteria query object just like any other Criterion object The following basic example searches for suppliers that match the name on the example Supplier object: Criteria crit = sessioncreateCriteria(Supplierclass); Supplier supplier = new Supplier(); suppliersetName("MegaInc"); critadd(Examplecreate(supplier)); List results = critlist(); When Hibernate translates your example object into an SQL query, all of the properties on your example objects get examined.

Using Bind Variables The SQL query in Listings 5-1 and 5-3 uses positional bind variables denoted by , which are static. Any change in the position of the bind variable will lead to a change in the code that sets this variable value. In Listing 5-1, the arguments in the method call PreparedStatement.setXXX will be affected. Similarly, in Listing 5-3, the position of the array elements would have to be altered to accommodate the query change. Spring JDBC provides a convenient solution to this with support for named bind variables denoted by :variable_name. To use this feature, you should change the SQL query as shown in Listing 5-7. Note that the signature of the savePolicyDetails method has also changed, and it now takes a Map object as an argument.

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