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Typically, you will specify your Hibernate configuration in a properties file called hibernate.properties in the root directory of your application s classpath. Hibernate has an extensive list of properties for configuration (see Table 2-1) not all of them are required, of course, because of sensible defaults. You will need to configure a JDBC connection here, provide one programmatically in your application, or specify the JNDI name of a containerprovided JDBC connection. You should also configure the SQL dialect specific to your deployment database that Hibernate should use to generate SQL. We discuss SQL dialects in more detail later in the chapter.

The configuration for an entity manager is templated from the EntityManagerFactory that created it, but it is defined separately as a persistence unit A persistence unit dictates either implicitly or explicitly the settings and entity classes used by all entity managers obtained from the unique EntityManagerFactory instance bound to that persistence unit There is, therefore, a one-to-one correspondence between a persistence unit and its concrete EntityManagerFactory Persistence units are named to allow differentiation of one EntityManagerFactory from another This gives the application control over which configuration or persistence unit is to be used for operating on a particular entity..

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Figure 2-1. Relationships between JPA concepts Figure 2-1 shows that for each persistence unit there is an EntityManagerFactory and that many entity managers can be created from a single EntityManagerFactory. The part that may come as a surprise is that many entity managers can point to the same persistence context. We have talked only about an entity manager and its persistence context, but later on we will see that there may in fact be multiple references to different entity managers all pointing to the same group of managed entities. This will enable the control flow to traverse container components but continue to be able access the same persistence context.

also needs to be wired up in the Spring application context, as shown in Listing 6-10.

An entity manager is always obtained from an EntityManagerFactory. The factory from which it was obtained determines the configuration parameters that govern its operation. While there are shortcuts that veil the factory from the user view when running in a Java EE application server environment, in the Java SE environment we can use a simple bootstrap class called Persistence. The static createEntityManagerFactory() method in the Persistence class returns the EntityManagerFactory for the specified persistence unit name. The following example demonstrates creating an EntityManagerFactory for the persistence unit named EmployeeService : EntityManagerFactory emf = Persistence.createEntityManagerFactory("EmployeeService"); The name of the specified persistence unit EmployeeService passed into the createEntityManagerFactory() method identifies the given persistence unit configuration that determines such things as the connection parameters that entity managers generated from this factory will use when connecting to the database.

hibernate.connection.provider_class hibernate.connection.driver_class hibernate.connection.isolation hibernate.connection.url hibernate.connection.username hibernate.connection.password hibernate.connection.autocommit hibernate.connection.pool_size hibernate.connection.datasource hibernate.connection.<JDBCpropertyname>

The AbstractQuery interface provides the subquery() method for creation of subqueries. Subqueries may be correlated (meaning that they reference a root, path, or join from the parent query) or non-correlated. The criteria API supports both correlated and non-correlated subqueries, again using query roots to tie the various clauses and expressions together. The argument to subquery() is a class instance representing the result type of the subquery. The return value is an instance of Subquery, which is itself an extension of AbstractQuery. With the exception of restricted methods for constructing clauses, the Subquery instance is a complete query definition like CriteriaQuery that may be used to create both simple and complex queries.

< xml version="1.0" encoding="UTF-8" > <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> <beans> <! Other beans --> <bean id="authenticationManager" class="org.springframework.security.providers.ProviderManager"> <property name="providers"> <list> <ref local="daoAuthenticationProvider"/> </list> </property> </bean> <bean name="daoAuthenticationProvider" class="org.springframework. security.providers.dao.DaoAuthenticationProvider"> <property name="userDetailsService" ref="authenticationDao "/> </bean> <bean name="authenticationDao" class="org.springframework.security.userdetails.jdbc.JdbcDaoImpl"> <property name="dataSource" ref="dataSource"/> </bean> <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">

To demonstrate subquery usage, let s look at a more significant example, modifying Listing 9-2 to use subqueries instead of the distinct() method to eliminate duplicates. According to the data model shown in Figure 8-1, the Employee entity has relationships with four other entities: single-valued relationships with Department and Address, and collection-valued relationships with Phone and Project. Whenever we join across a collection-valued relationship, we have the potential to return duplicate rows; therefore, we need to change the criteria expression for Project to use a subquery. Listing 9-5 shows the code fragment required to make this change. Listing 9-5. Modified Employee Search With Subqueries @Stateless public class SearchService { @PersistenceContext(unitName="EmployeeHR") EntityManager em; public List<Employee> findEmployees(String name, String deptName, String projectName, String city) { CriteriaBuilder cb = em.getCriteriaBuilder(); CriteriaQuery<Employee> c = cb.createQuery(Employee.class); Root<Employee> emp = c.from(Employee.class); c.select(emp); // ... if (projectName != null) { Subquery<Employee> sq = c.subquery(Employee.class); Root<Project> project = sq.from(Project.class); Join<Project,Employee> sqEmp = project.join("employees"); sq.select(sqEmp) .where(cb.equal(project.get("name"), cb.parameter(String.class, "project"))); criteria.add(cb.in(emp).value(sq)); } } // ...

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