Java Persistence with Hibernate 2nd phần 2 doc

... into persistence. xml (see listing 2. 13). < ;persistence- unit name="helloworld"> <provider>org .hibernate. ejb.HibernatePersistence</provider> <! Not needed, Hibernate ... next section, we walk through the “Hello World” example again, with Java Persistence interfaces and EJB 3.0. 2. 2 Starting a Java Persistence project In the following sectio...

Ngày tải lên: 12/08/2014, 19:21

... command objects 721 Variations of the Command pattern 723 16.4 Designing applications with EJB 3.0 725 Implementing a conversation with stateful beans 725 ■ Writing DAOs with EJBs 727 ■ Utilizing ... 417 ■ Working with detached entity instances 423 9.5 Using Java Persistence in EJB components 426 Injecting an EntityManager 426 ■ Looking up an EntityManager 429 ■ Access...

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 ... String home billing Figure 4 .2 Relationships between User and Address using composition 1 62 CHAPTER 4 Mapping persistent classes 4 .2. 1 Understanding Java identity and equality...

Ngày tải lên: 12/08/2014, 19:21

... types 24 5 ■ Write the collection property with the java. util.Collection interface, and, on declaration, initialize it with an ArrayList of the JDK. Map the collection in Hibernate with a ... placed outside any Java class declaration (right after the import statements) or in a separate file, pack- age-info .java , as discussed in chapter 2, section 2. 2.1, “Using Hibern...

Ngày tải lên: 12/08/2014, 19:21

... 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 ... assume that you’ve tried to reverse-engineer your existing schema with the Hibernate toolset, as described in chapter 2, section 2. 3, “Reverse engineering a legacy database.” The...

Ngày tải lên: 12/08/2014, 19:21

... one EntityManagerFactory for each persistence unit you deploy in a Java Persistence application. We covered this already in chapter 2, section 2. 2 .2, “Using Hibernate EntityManager,” so we won’t ... 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. Tr...

Ngày tải lên: 12/08/2014, 19:21

... in Hibernate or Java Persistence applications. In this section, we’ll show you how to avoid this and how to execute bulk and batch operations with Hibernate and JPA. 12. 2.1 Bulk statements with ... with thread or JTA transaction binding in Java SE and Java EE. Persistence contexts are either scoped to the transaction, or managed by the application. Java Persisten...

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 ... layer 711 16 .2. 2 Implementing the generic CRUD interface Let’s continue with a possible implementation of the generic interface, using Hibernate APIs:...

Ngày tải lên: 12/08/2014, 19:21

... 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 Hibernate Validator with the presentation ... descriptor for an EJB 2. x entity bean. Furthermore, object/relational mapping as defined by Java Persistence is not only much more powerful and feature-rich than E...

Ngày tải lên: 12/08/2014, 19:21