Java Persistence with Hibernate 2nd phần 8 pptx

... 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

... auxiliary DDL 376 8. 4 Summary 3 78 PART 3CONVERSATIONAL OBJECT PROCESSING 381 9 Working with objects 383 9.1 The persistence lifecycle 384 Object states 385 ■ The persistence context 388 9.2 Object ... resulting appeal to the Java community. In addition to their contributions to Java Persistence, the Hibernate develop- ers also have taken major steps forward for Hibern...

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 ... The Hibernate type system, with all its built-in converters and transformers for Java value-typed properties to SQL datatypes, is the second big topic we discuss in this chapter....

Ngày tải lên: 12/08/2014, 19:21

... right one). Without extending Hibernate, you can choose from the following collections: ■ A java. util.Set is mapped with a <set> element. Initialize the collection with a java. util.HashSet . ... Ini- tialize with a java. util.ArrayList . ■ A java. util.Collection can be mapped with <bag> or <idbag> . Java doesn’t have a Bag interface or an imple...

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 ... schema, the DDL. 8. 3 Improving schema DDL Customizing the DDL in your Hibernate application is something you’ll usually consider only when you generate the database schema with H...

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

... 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 Persistence standardizes a persistence ... manipulate the Hibernate default behavior when objects are loaded and stored. Table 11.2 Hibernate and JPA comparison chart for chapter 11 Hibernate Core Java Persiste...

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 ... The persistence layer facade we introduced here doesn’t expose any Hiber- nate or Java Persistence interface to the client, so theoretically you can im...

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 ... state when the method returns, and the persistence context is closed. Listing 17.4 A stateless session bean with a data access facade B C D E F G B C D E F G 788 CHA...

Ngày tải lên: 12/08/2014, 19:21