Starting a Hibernate project for ( Iterator iter
Starting a Hibernate project for ( Iterator iter = messages.iterator(); iter.hasNext(); ) { Message loadedMsg = (Message) iter.next(); System.out.println( loadedMsg.getText() ); } newTransaction.commit(); newSession.close(); // Shutting down the application HibernateUtil.shutdown(); } } Place this code in the file HelloWorld.java in the source folder of your project, in the hello package. Let s walk through the code. The class has a standard Java main()method, and you can call it from the command line directly. Inside the main application code, you execute two separate units of work with Hibernate. The first unit stores a new Message object, and the second unit loads all objects and prints their text to the console. You call the Hibernate Session, Transaction, and Query interfaces to access the database: Session A Hibernate Session is many things in one. It s a single-threaded nonshared object that represents a particular unit of work with the database. It has the persistence manager API you call to load and store objects. (The Sessioninternals consist of a queue of SQL statements that need to be synchronized with the database at some point and a map of managed persistence instances that are monitored by the Session.) Transaction This Hibernate API can be used to set transaction boundaries programmatically, but it s optional (transaction boundaries aren t). Other choices are JDBC transaction demarcation, the JTA interface, or container- managed transactions with EJBs. Query A database query can be written in Hibernate s own object-oriented query language (HQL) or plain SQL. This interface allows you to create queries, bind arguments to placeholders in the query, and execute the query in various ways. Ignore the line of code that calls HibernateUtil.getSessionFactory() we ll get to it soon.
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