Java Persistence with Hibernate 2nd phần 5 potx

... to a new Session (with update() or saveOrUpdate() ), Hibernate may execute unnecessary SQL UPDATE statements to ensure that the database state is synchro- nized with the persistence context ... cases. Also note that this mapping Figure 7. 15 Using a discriminator column with an any association 318 CHAPTER 7 Advanced entity association mappings Hibernate executes a UNION...

Ngày tải lên: 12/08/2014, 19:21

... and collections that contain references to entity instances. Table 5. 5 Hibernate and JPA comparison chart for chapter 5 Hibernate Core Java Persistence and EJB 3.0 Supports four inheritance mapping strategies. ... types 2 45 ■ Write the collection property with the java. util.Collection interface, and, on declaration, initialize it with an ArrayList of the JDK. Map the...

Ngày tải lên: 12/08/2014, 19:21

... interception 54 0 Dynamic data filters 54 1 ■ Intercepting Hibernate events 54 6 The core event system 55 3 ■ Entity listeners and callbacks 55 6 12.4 Summary 55 8 13 Optimizing fetching and caching 55 9 13.1 ... 56 8 ■ Lazy loading with interception 57 1 13.2 Selecting a fetch strategy 57 3 Prefetching data in batches 57 4 ■ Prefetching collections with subselects 57 7 ■...

Ngày tải lên: 12/08/2014, 19:21

... rewrite the main application code with JPA. “Hello World” with JPA These are your primary programming interfaces in Java Persistence: ■ javax .persistence. Persistence —A startup class that provides ... <all required libraries> +src +hello HelloWorld .java Message .java Message.hbm.xml +persistence HibernateUtil .java hibernate. cfg.xml (or hibernate. properties) log...

Ngày tải lên: 12/08/2014, 19:21

... Also, the Java Persistence interfaces don’t support full polymorphic queries; only mapped entities ( @Entity ) can be officially part of a Java Persistence query (note that the Hibernate query ... switch to field access). With annotations, declare immutability (and automatic refresh) with the @Generated Hibernate annotation: Mapping entities with identity 1 65 Type.A...

Ngày tải lên: 12/08/2014, 19:21

... level (the database) and how you work with transactions in an application that is based on native Hibernate, on Java Persistence, and with or without Enterprise JavaBeans. Transactions allow you ... annotated with @Tran- sient or the transient Java keyword). In this code example, the next synchroni- zation with the database occurs when the resource-local transaction is comm...

Ngày tải lên: 12/08/2014, 19:21

... 11.2 Hibernate and JPA comparison chart for chapter 11 Hibernate Core Java Persistence and EJB 3.0 Persistence context propagation is available with thread or JTA transaction binding in Java ... CascadeType.ALL) @org .hibernate. annotations.Cascade( org .hibernate. annotations.CascadeType.DELETE_ORPHAN ) private Set<Bid> bids = new HashSet<Bid>(); Transitive persis...

Ngày tải lên: 12/08/2014, 19:21

... the expressiveness and flexibility that you’re used to. This isn’t the case with Hibernate and Java Persistence. Hibernate s powerful query facilities allow you to express almost everything you ... navigating associations to new Criteria s. With the Java Persistence API, your starting point for queries is the EntityMan- ager . To create a javax .persistence. Query insta...

Ngày tải lên: 12/08/2014, 19:21

... are the same. Java Persistence standardizes JPA QL and also allows the fallback to native SQL. 15. 2.3 Native SQL in Java Persistence Java Persistence supports native SQL queries with the createNativeQuery() method ... SQL queries. Hibernate supports this. Next, we discuss another more exotic but convenient Hibernate feature (Java Persistence doesn’t have an equiv...

Ngày tải lên: 12/08/2014, 19:21

... localeSelector.selectLanguage() method, with literal arguments. Figure 17.11 Seam decorates the input fields with validation error messages. The Java EE 5. 0 programming model 759 You can call the session ... database-integrity rule in a single Java annotation and use Hibernate Validator to check instances of an annotated class at runtime. ■ Seam With Seam, you can integrate H...

Ngày tải lên: 12/08/2014, 19:21