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Because properties can be defined inside targets, simply running ant debug will not necessarily display them all. Running two targets from a single command line execution will, since properties retain their values across target invocations. For example, if the init target sets properties, running ant init debug will display the properties set by init. 57. Increase Ant s verbosity level. By default, messages displayed to the console during Ant builds are only a fraction of the messages generated by the Ant engine and tasks. To see all logged output, use the debug switch:

Casts a given type t to a Hibernate Type Returns the index of joined collection element Returns an element or index of indexed collections (maps, lists, arrays)

Most of these HQL functions translate into a counterpart in SQL you ve probably used before. This translation table is customizable and extendable with an org.hibernate.Dialect. Check the source code of the dialect you re using for your database; you ll probably find many other SQL functions already registered there for immediate use in HQL. Keep in mind that every function that isn t included in the org.hibernate.Dialect superclass may not be portable to other database management systems! Another recent addition to the Hibernate API is the addSqlFunction() method on the Hibernate Configuration API:

The debug switch generates an enormous amount of output. A good compromise is the verbose switch, which outputs more than the default informational level of output, but less than the debugging output.

Configuration cfg = new Configuration(); cfg.addSqlFunction( "lpad", new StandardSQLFunction("lpad", Hibernate.STRING) ); ... cfg.buildSessionFactory();

Ant s distribution ships with extensive documentation in HTML format, including details for every task. Why then, do we include a task reference in this book We felt readers would benefit from a quick reference they could consult while reading the book, or flip through while away from their computers, or as a quick reference to the valid attributes and elements of a task. We didn t want to rewrite the documentation, as it would have taken a lot of effort for little real benefit. At the same time, we didn t want to include the current documentation as it is too detailed for a quick reference, yet not guaranteed to be accurate. Because Ant s current task documentation is decoupled from the source of the tasks, it is out of sync with the tasks in some places. To address these needs, we created an automated process to analyze Ant s source code and extract task details directly. This process used XDoclet s custom capabilities, allowing generation of an XML file for each task. These XML files contain information such as task description and all supported attribute and element names, types, and descriptions.1 We expect the future releases of Ant to adopt this process, improving the online documentation accordingly.

This operation adds the SQL function lpad to HQL. See the Javadoc of StandardSQLFunction and its subclasses for more information. HQL even tries to be smart when you call a function that wasn t registered for your SQL dialect: Any function that is called in the WHERE clause of an HQL statement, and that isn t known to Hibernate, is passed directly to the database, as an SQL function call. This works great if you don t care about database portability, but it requires that you keep your eyes open for nonportable functions if you do care. Finally, before we move on to the SELECT clause in HQL and JPA QL, let s see how results can be ordered. Ordering query results All query languages provide some mechanism for ordering query results. HQL and JPA QL provide an ORDER BY clause, similar to SQL. This query returns all users, ordered by username:

The XDoclet work included a custom subtask, tag handler, and template. The process was simple from that point forward. The XML files were merged using <concat> and transformed into HTML using <xslt>. The code for this autogeneration exists within Ant s source code repository.

You specify ascending and descending order using asc or desc:

You may order by multiple properties:

Here then is a quick guide to all the tasks, automatically generated from the source itself. It lists all tasks in Ant 1.5 and their nested elements and attributes. We have omitted any examples, or any details, on the nested elements. For these we refer you to the online documentation, and, of course, the many chapters in our book.