By Jeffrey Sambells, Michael Purvis, Cameron Turner
starting Hibernate is perfect if youre skilled in Java with databases (the conventional, or "connected," approach), yet are new to open resource light-weight Hibernatethe most well-liked de facto object-relational mapping and database-oriented software improvement framework. This publication packs in fresh information regarding the newest liberate of the Hibernate 3.2.x patience layer and offers a transparent creation to the present regular for object-relational patience in Java.
Experienced writer Dave Minter and contributor Jeff Linwood offer extra in-depth examples than the other books for Hibernate rookies. The authors additionally current fabric in a full of life, example-based mannernot in a dry, theoretical, hard-to-read model. and because the e-book retains its specialize in Hibernate with no losing time on nonessential third-party instruments, youll be capable of instantly begin development transaction-based engines and applications.
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All the other properties take sensible default values, so they do not need to be explicitly stated. Table 2-1. acquire_increment After the connection pool is completely utilized, determines how many new connections are added to the pool. idle_test_period Determines how long to wait before a connection is validated. max_size The maximum size of the connection pool for C3PO. max_statements The upper limit for the SQL statement cache for C3PO. min_size The minimum size of the connection pool for C3PO.
Base"/> The properties file imported in the first line provides the paths to your installed libraries, and you should adjust it as appropriate (as shown in Listing 3-2). 2, which we have renamed to the full version path; we have done something similar with the HSQL database directory. The Hibernate Tools archive currently unpacks to two directories (plugins and features). We have created a parent directory to contain these. path property to point our build script at this. Listing 3-2.
The configure() method returns an instance of Configuration, which can be used to obtain a Hibernate SessionFactory instance by calling the buildSessionFactory() method, as follows: public SessionFactory buildSessionFactory() throws HibernateException The SessionFactory is a heavyweight object, and your application should use one Hibernate SessionFactory object for each discrete database instance that it interacts with. The SessionFactory relies on the Hibernate configuration properties, which we detail in the next section of this chapter.