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Controlling the output level of programs is not only useful when debugging, but when trying to run a large build that has worked in the past; only errors and occasional progress messages matter. A quiet build with a few manual <echo level= "warning"> tags is ideal for a bulk build. Likewise, some <echo level="verbose"> tags can provide extra trace information when more detail is required. ANT COMMAND LINE OPTIONS 43

You now map this class to its own STOLEN_CREDIT_CARD table, either with an XML file or JPA annotations (you shouldn t have any problem doing this on your own). Next, you need a statement that executes directly in the database, retrieves all compromised credit cards, and creates new StolenCreditCard objects:

Getting information about a project The final option of immediate relevance is -projecthelp. It lists the main targets in a project, and is invaluable whenever you need to know what targets a build file provides. Ant only lists targets containing the optional description attribute, as these are the targets intended for public consumption.

Query q = session.createQuery( "insert into StolenCreditCard (type, number, expMonth, expYear,

>ant -projecthelp Buildfile: build.xml Main targets: Subtargets: archive clean compile execute init Default target: archive

ownerFirstname, onwerLastname, ownerLogin, ownerEmailAddress, ownerHomeAddress) select c.type, c.number, c.expMonth, c.expYear, u.firstname, u.lastname, u.username, u.email, u.homeAddress from CreditCard c join c.user u where c.stolenOn is not null" ); int createdObjects = q.executeUpdate();

This operation does two things: First, the details of CreditCard records and the respective owner (a User) are selected. The result is then directly inserted into the table to which the StolenCreditCard class is mapped. Note the following:

This is not very informative, which is our fault for not documenting the file thoroughly enough. If we add a description attribute to each target, such as description="Compiles the source code" for the compile target, and a <description> tag right after the project declaration, then the target listing includes these descriptions, marks all the described targets as main targets, and hides all sub targets from view:

The properties that are the target of an INSERT ... SELECT (in this case, the StolenCreditCard properties you list) have to be for a particular subclass, not an (abstract) superclass. Because StolenCreditCard isn t part of an inheritance hierarchy, this isn t an issue. The types returned by the SELECT must match the types required for the INSERT in this case, lots of string types and a component (the same type of component for selection and insertion). The database identifier for each StolenCreditCard object will be generated automatically by the identifier generator you map it with. Alternatively, you can add the identifier property to the list of inserted properties and supply a value through selection. Note that automatic generation of identifier values works only for identifier generators that operate directly inside the database, such as sequences or identity fields. If the generated objects are of a versioned class (with a version or timestamp property), a fresh version (zero, or timestamp of today) will also be generated. Alternatively, you can select a version (or timestamp) value and add the version (or timestamp) property to the list of inserted properties.

Buildfile: build.xml Compiles and runs a simple program Main targets: archive clean compile execute Creates the JAR file Removes the temporary directories used Compiles the source code Runs the program

Finally, note that INSERT ... SELECT is available only with HQL; JPA QL doesn t standardize this kind of statement hence, your statement may not be portable. HQL and JPA QL bulk operations cover many situations in which you d usually resort to plain SQL. On the other hand, sometimes you can t exclude the application tier in a mass data operation.

To see both main and sub targets in a project, you must call Ant with the options -projecthelp and -verbose. The more complex a project is, the more useful the -projecthelp feature becomes. We strongly recommend providing description strings for every target intended to act as an entry point to external callers, and a line or two at the top of each build file describing what it does.