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An issue to consider with string dynamic queries, however, is the cost of translating the JP QL string to SQL for execution A typical query engine will have to parse the JP QL string into a syntax tree, get the object-relational mapping metadata for each entity in each expression, and then generate the equivalent SQL For applications that issue many queries, the performance cost of dynamic query processing can become an issue Many query engines will cache the translated SQL for later use, but this can easily be defeated if the application does not use parameter binding and concatenates parameter values directly into query strings This has the effect of generating a new and unique query every time a query that requires parameters is constructed.

As you see in Figure 4-3, the AbstractEnterpriseBean class forms the core of the Spring EJB support classes. This class can be subclassed to support different forms of EJBs such as session beans, message-driven beans, and so on. However, in most cases, you will not need to do that because Spring already provides the appropriate subclasses. The AbstractEnterpriseBean class helps create and load a Spring bean factory and makes it available to the EJB.

Consider the session bean method shown in Listing 7-7 that searches for salary information given the name of a department and the name of an employee There are two problems with this example, one performance-related and one security-related Because the names are concatenated into the.

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string instead of using parameter binding, it is effectively creating a new and unique query each time. One hundred calls to this method could potentially generate one hundred different query strings. This not only requires excessive parsing of JP QL but also almost certainly makes it difficult for the persistence provider if it attempts to build a cache of converted queries. Listing 7-7. Defining a Query Dynamically @Stateless public class QueryServiceBean implements QueryService { @PersistenceContext(unitName="DynamicQueries") EntityManager em; public long queryEmpSalary(String deptName, String empName) { String query = "SELECT e.salary " + "FROM Employee e " + "WHERE e.department.name = '" + deptName + "' AND " + " e.name = '" + empName + "'"; return em.createQuery(query, Long.class).getSingleResult(); }

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The AbstractEnterpriseBean is generic, and Spring provides a specialized AbstractSessionBean class to develop session bean components. This class implements the SessionBean interface and takes on the responsibility of saving the SessionContext object injected by the EJB container. However, it should not be extended for supporting SLSBs. Instead, your bean implementation should inherit from the more specialized AbstractStatelessSessionBean. This class implements all the EJB callback methods. This is very useful because in most cases you would require empty implementation of these callbacks. This feature cleans up the bean implementation classes, promotes reuse, and allows it to focus only on business logic. The subclasses should override the onEjbCreate method to carry out any post-initialization after loading the bean factory. Finally, Listing 4-17 shows the bean implementation class.

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