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The efficient recovery of lost data is the end goal of all backup jobs. A backup job is a single process of backing up data. Regularly backing up the data on server hard disks and client computer hard disks prevents data loss caused by disk drive failures, power outages, virus infections, and other such incidents. If data loss occurs, and you have carefully planned and performed regular backups, you can restore the lost data, whether it is a single file or an entire hard disk.

Meta-attributes can be inherited; that is, if you declare a use-in-tostring at the level of a <class> element, all properties of that class are included in the toString() method. This inheritance mechanism works for all hbm2java metaattributes, but you can turn it off selectively:

Describe the Backup utility that is provided in Windows XP Professional Identify the permissions and rights that are required to back up and restore data Plan a backup Select a type of backup operation Change the default backup options in Windows XP Professional

The Windows Backup utility provides a simple interface for backing up and restoring data. To access the Backup Or Restore Wizard, on the Start menu, point to All Programs, point to Accessories, point to System Tools, and then click Backup. Alternatively, on the Start menu, you can click Run, type ntbackup, and then click OK. You can use Backup in two modes: Wizard mode In Wizard mode, Backup steps you through the process of backing up or restoring your data. Advanced mode In Advanced mode, Backup presents a more traditional backup interface for selecting files and backup locations.

Setting inherit to false in the scope-class meta-attribute creates only the parent class of this <meta> element as public abstract, but not any of the (possibly) nested subclasses. The hbm2java exporter supports, at the time of writing, 17 meta-attributes for fine-tuning code generation. Most are related to visibility, interface implementation, class extension, and predefined Javadoc comments. Refer to the Hibernate Tools documentation for a complete list. If you use JDK 5.0, you can switch to automatically generated static imports and generics with the jdk5="true" setting on the <hbm2java> task. Or, you can produce EJB 3.0 entity classes with annotations. Generating Java Persistence entity classes Normally, you use either Hibernate XML mapping files or JPA annotations in your entity class source code to define your mapping metadata, so generating Java Persistence entity classes with annotations from XML mapping files doesn t seem reasonable. However, you can create entity class source code with annotations directly from JDBC metadata, and skip the XML mapping step. Look at the following Ant target:

In Wizard mode, you will use the Backup Or Restore Wizard, shown in Figure 20-1, to back up or restore data. By default, Backup launches the Backup Or Restore Wizard when you launch the utility. You can use the Backup Or Restore Wizard to back up data manually or to schedule unattended backup jobs on a regular basis. You can back up data to a file or to a tape. Files can be stored on hard disks, in shared folders on a network, or on drives with removable media (such as Iomega Zip and Jaz drives or tape drives).

20-3

<target name="reveng.entities" description="Produces Java entity classes in src directory"> <hibernatetool destdir="${basedir}/src"> <jdbcconfiguration propertyfile="${basedir}/helloworld.db.properties" revengfile="${basedir}/helloworld.reveng.xml"/> <hbm2java jdk5="true" ejb3="true"/> <hbm2cfgxml ejb3="true"/> </hibernatetool> </target>

Note Windows Backup does not support writing directly to a CD-ROM or DVD during the backup process. However, you can back up to a hard drive and then manually copy the backup file to optical media.

Figure 20-1

This target generates entity class source code with mapping annotations and a hibernate.cfg.xml file that lists these mapped classes. You can edit the Java source directly to customize the mapping, if the customization in helloworld.reveng.xml is too limited. Also note that all exporters rely on templates written in the FreeMarker template language. You can customize the templates in whatever way you like, or even write your own. Even programmatic customization of code generation is possible. The Hibernate Tools reference documentation shows you how these options are used. Other exporters and configurations are available with the Hibernate Tools:

On the Welcome To The Backup Or Restore Wizard page, click Next. The Backup Or Restore page allows you to specify whether you want to back up files and settings or restore files and settings.