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Now that you ve completed the Hibernate configuration file, you can move on and create the SessionFactory in your application. Handling the SessionFactory In most Hibernate applications, the SessionFactory should be instantiated once during application initialization. The single instance should then be used by all code in a particular process, and any Session should be created using this single SessionFactory. The SessionFactory is thread-safe and can be shared; a Session is a single-threaded object. A frequently asked question is where the factory should be stored after creation and how it can be accessed without much hassle. There are more advanced but comfortable options such as JNDI and JMX, but they re usually available only in full Java EE application servers. Instead, we ll introduce a pragmatic and quick solution that solves both the problem of Hibernate startup (the one line of code) and the storing and accessing of the SessionFactory: you ll use a static global variable and static initialization. Both the variable and initialization can be implemented in a single class, which you ll call HibernateUtil. This helper class is well known in the Hibernate community it s a common pattern for Hibernate startup in plain Java applications without Java EE services. A basic implementation is shown in listing 2.6.

Readability and maintainability are the prevailing rationales for most of these items. Some IDE and XML editors have an annoying habit of reformatting NOTE build.xml automatically use these with caution if you care about the aesthetics of your build file. If your build file will be manually edited and readability is desired, craft it your way; and if a tool attempts to spoil it, complain to the vendor and avoid using it. 8. Provide the < xml > directive. Include the encoding if there are characters outside the ASCII range:

Query q = session.createQuery("from Item") .setComment("My Comment..."); Criteria criteria = session.createCriteria(Item.class) .setComment("My Comment..."); Query q = em.createQuery("select i from Item i") .setHint("org.hibernate.comment", "My Comment...");

The hints you ve been setting so far are all related to Hibernate or JDBC handling. Many developers (and DBAs) consider a query hint to be something completely different. In SQL, a query hint is a comment in the SQL statement that contains an instruction for the SQL optimizer of the database management system. For example, if the developer or DBA thinks that the execution plan selected by the database optimizer for a particular SQL statement isn t the fastest, they use a hint to force a different execution plan. Hibernate and Java Persistence don t support arbitrary SQL hints with an API; you ll have to fall back to native SQL and write your own SQL statement you can of course execute that statement with the provided APIs. (With some database-management systems you can control the optimizer with an SQL comment at the beginning of an SQL statement; in that case, use Query.setComment() to add the hint. In other scenarios, you may be able to write an org.hibernate.Interceptor and manipulate an SQL statement in the onPrepareStatement(sql) method before it s sent to the database.) Finally, you can control whether a query should force a pessimistic lock in the database management system a lock that is held until the end of the database transaction:

9. Use consistent indentation. Keep <project> at the very left edge, along with the < xml ... > tag. Two or four spaces is typical, no hard tabs. Keep closing elements aligned with opening elements, as in <target> here:

Query q = session.createQuery("from Item item") .setLockMode("item", LockMode.UPGRADE); Criteria criteria = session.createCriteria(Item.class) .setLockMode(LockMode.UPGRADE);

< xml version="1.0"> <project> ..<target name="init"> ....<mkdir dir="${build.dir}"/> ..</target> </project>

Both queries, if supported by your database dialect, result in an SQL statement that includes a ... FOR UPDATE operation (or the equivalent, if supported by the database system and dialect). Currently, pessimistic locking isn t available (but it s planned as a Hibernate extension hint) on the Java Persistence query interface. Let s assume that queries are now prepared, so you can run them.

10. One-line elements are acceptable. This typically only applies to elements that combine their start and finish tags into one.

Once you ve created and prepared a Query or Criteria object, you re ready to execute it and retrieve the result into memory. Retrieving the whole result into

memory in one turn is the most common way to execute a query; we call this listing. Some other options are available that we also discuss next:, iterating and scrolling. Scrolling is about as useful as iteration: You rarely need one of these options. We d guess that more than 90 percent of all query execution relies on the list() and getResultList() methods in a regular application. First, the most common case. Listing all results In Hibernate, the list() method executes the query and returns the results as a java.util.List:

11. Break up long lines. Follow conventions similar to Java coding. Lines typically should not be longer than 80 characters, although other considerations may lower this limit. Break lines when they become longer than the limit, or when readability would be increased by breaking them. These guidelines assist in breaking long lines. 546

List result = myQuery.list();

Place the first attribute of an XML element on the same line as the start element tag, and place subsequent attributes on new lines indented to the same level as the first attribute.

The Criteria interface also supports this operation:

<javac destdir="${build.classes.dir}" debug="${build.debug}" includeAntRuntime="yes" srcdir="${src.dir}" />

List result = myCriteria.list();