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Reducing database operations directly improves performance of applications. But while using the EJB 3 JPA you don t directly write SQL since the SQL is generated by the persistence provider. At this point you re asking yourself, Then how you can reduce the database operations We re glad you asked Choosing the right fetch type In chapter 9 you learned that a relationship may either be eagerly or lazily loaded. Lazy loading leads to multiple SQL statements, whereas eager loading relates to a SQL JOIN statement and translates to unnecessary data. If you re using EJB 3, by default the associated entities are eagerly loaded when you have a one-to-one or many-to-one relationship, or lazily loaded when you have a one-to-many or manyto-many relationship. However, there may be several situations when you don t need a related entity, such as the BillingInfo for a given User, or a related ItemDetails for a specific Item. In such cases you can disable eager loading. There may also be situations when you want a related collection of entities to be loaded automatically, where a one-to-many relationship exists that forces you to switch to EAGER loading. We warn you to be very careful when turning on eager loading for one-to-many relationships. If you re not sure whether eager loading is the right strategy for your association, you may want to try setting eager loading in your JPQL query. Suppose you

size 41 .. custom attributes elided for clarity here .. } // end of class '<CppImplementationDetails>'$ArrayType$$$BY0CJ@$$CBD.

want to eagerly load the BillingInfo for a User entity. We can use the FETCH clause with a JOIN like this:

Note The target namespace is typically expressed as a Uniform Resource Identifier (URI), but it is not

This query will eagerly load the BillingInfo object for User even if fetch mode is specified as LAZY in the association definition. Deferring database updates until the end of transactions By default the flush mode for EJB 3 is AUTO; that is, the EJB 3 persistence providers execute SQL statements to update the database at the end of the transaction and whenever a query is executed that may retrieve updated data. The persistence providers optimize SQL at the end of the transaction. You can control the database updates by using the EntityManager s flush method. Using flush in between a transaction may lead to multiple SQL statements. Excessive use of flush may degrade the performance of your application, so we recommend that you not use it unless you have exhausted all other options. You can optionally set the flush mode to COMMIT. This means that all updates are deferred until the end of the transaction. In this situation the EntityManager doesn t check for pending changes. You can set FlushMode for the EntityManager em as follows:

em.setFlushMode(FlushModeType.COMMIT)

This will set FlushMode to COMMIT for all queries executed within the active persistence context. On the other hand, if you want to set FlushMode on a per-query basis, you can do this:

In native C++, these string literals are internally placed into a data section. To access this data via a value type, the C++/CLI compiler generates metadata for global variables that map to the native string literal data. This is shown in the following ILDASM excerpt: .field static assembly valuetype '<CppImplementationDetails>'.$ArrayType$$$BY0BG@$$CB_W modopt([mscorlib]System.Runtime.CompilerServices.IsConst) ' A0x567a3bdb.unnamed-global-0' at D_00003120 .field static assembly valuetype '<CppImplementationDetails>'.$ArrayType$$$BY0CJ@$$CBD modopt([mscorlib]System.Runtime.CompilerServices.IsConst) ' A0x567a3bdb.unnamed-global-1' at D_0000314C

Query query = em.createNamedQuery("findAllItems"); query.setFlushMode(FlushModeType.COMMIT); List items = query.getResultList();

As you can see, you have the flexibility to manually control flushing by calling the flush method, setting FlushMode on a persistence context basis (discussed in chapter 9), or setting FlushMode on a per-query basis (discussed in chapter 10). The EJB 3 Expert Group wants you to have your FlushMode your way ! Using the lowest-cost lock in the database Although the EJB 3 JPA doesn t require persistence providers to support pessimistic locking, your persistence provider may support this lock mode as an extension.

required to resolve to an actual location. The schema definitions that are presented in this book happen to be stored as XSD files at http://www.bluestonepartners.com/soa.aspx. For your convenience, they are also included in the sample code downloads (available in the Source Code/Download section on the Apress web site at http://www.apress.com).