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Listing 9-5 contains a couple of significant changes to the example first presented in Listing 9-2. First, the distinct() method call has been removed as well as the join to the Project entity. We have also introduced a new non-correlated subquery against Project. Because the subquery from Listing 9-5 declares its own root and does not reference anything from the parent query, it runs independently and is therefore non-correlated. The equivalent JP QL query with only Project criteria would be: SELECT e FROM Employee e WHERE e IN (SELECT emp FROM Project p JOIN p.employees emp WHERE p.name = :project) Whenever we write queries that use subqueries, there is often more than one way to achieve a particular result. For example, we could rewrite the previous example to use EXISTS instead of IN and shift the conditional expression into the WHERE clause of the subquery.

As shown in Listing 6-10, the JdbcDaoImpl requires a DataSource reference to execute its query. The JdbcDaoImpl assumes you have set up two tables in the database as shown in Figure 6-7.

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Class that implements Hibernate s ConnectionProvider interface. The JDBC driver class. The transaction isolation level for the JDBC connection. The JDBC URL to the database instance. Database username. Database password. Uses autocommit for the JDBC connection. Limits the number of connections waiting in the Hibernate database connection pool. Datasource name for a container-managed data source. Passes any JDBC property you would like to the JDBC connection for instance, hibernate.connection.debuglevel=info would pass a JDBC property called debuglevel. Initial context class for JNDI. Provides URL for JNDI. Passes any JNDI property you would like to the JNDI InitialContext. If this property is set, the Hibernate session factory will bind to this JNDI name. SQL dialect to use for Hibernate, varies by database. See section on SQL dialects. Default database owner name that Hibernate uses to generate SQL for unqualified table names. Default database catalog name that Hibernate uses to generate SQL for unqualified table names. Logs the generated SQL commands. Generates SQL with comments. Determines how deep Hibernate will go to fetch the results of an outer join. Used by Hibernate s outer join loader. Determines if binary data is read or written over JDBC as streams.

if (projectName != null) { Subquery<Project> sq = csubquery(Projectclass); Root<Project> project = sqfrom(Projectclass); Join<Project,Employee> sqEmp = projectjoin("employees"); sqselect(project) where(cbequal(sqEmp, emp), cbequal(projectget("name"), cbparameter(Stringclass,"project"))); criteriaadd(cbexists(sq)); } By referencing the Employee root from the parent query in the WHERE clause of the subquery, we now have a correlated subquery This time the query takes the following form in JP QL: SELECT e FROM Employee e WHERE EXISTS (SELECT p FROM Project p JOIN pemployees emp WHERE emp = e AND pname = :name) We can still take this example further and reduce the search space for the subquery by moving the reference to the Employee root to the FROM clause of the subquery and joining directly to the list of projects specific to that employee.

In JP QL, we would write this as follows: SELECT e FROM Employee e WHERE EXISTS (SELECT p FROM eprojects p WHERE pname = :name) In order to re-create this query using the criteria API, we are confronted with a dilemma We need to base the query on the Root object from the parent query but the from() method only accepts a persistent class type The solution is the correlate() method from the Subquery interface It performs a similar function to the from() method of the AbstractQuery interface, but does so with Root and Join objects from the parent query The following example demonstrates how to use correlate() in this case: if (projectName != null) { Subquery<Project> sq = csubquery(Projectclass); Root<Employee> sqEmp = sqcorrelate(emp); Join<Employee,Project> project = sqEmpjoin("projects"); sqselect(project) where(cbequal(projectget("name"), cbparameter(Stringclass,"project"))); criteriaadd(cb.

To retrieve data from these tables, the JdbcDaoImpl uses the default SQL statements shown in Listing 6-11.

exists(sq)); } Before we leave subqueries in the criteria API, there is one more corner case with correlated subqueries that we need to explore: referencing a join expression from the parent query in the FROM clause of a subquery Consider the following example that returns projects containing managers with direct reports earning an average salary higher than a user-defined threshold: SELECT p FROM Project p JOIN pemployees e WHERE TYPE(p) = DesignProject AND edirects IS NOT EMPTY AND.

hibernate.jndi.class hibernate.jndi.url hibernate.jndi.<JNDIpropertyname> hibernate.session_factory_name hibernate.dialect hibernate.default_schema

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