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You can use Windows PowerShell, which is installed by default on computers running the Windows 7 operating system, to generate a list of installed updates. It is also possible to generate a list of updates on remote computers by running this command against a remote computer that is specially configured for remote management through Windows PowerShell. To complete this exercise, perform the following steps.

Description Compresses only the folder that you have selected Compresses the folder and all subfolders and files that are contained within it and subsequently added to it

You can also set the compression state of an entire NTFS drive or volume. To do so, in Windows Explorer, right-click the drive or volume, and then click Properties. In the Properties dialog box, select the Compress Drive To Save Disk Space check box, as shown in Figure 10-16, and then click OK.

Query q = session.createQuery("update Item i set i.isActive = :isActive"); q.setBoolean("isActive", true); int updatedItems = q.executeUpdate();

Figure 10-16 Use the Properties dialog box of a drive or volume to apply compression to the entire drive or volume.

Windows Explorer makes it easy for you to see whether a file or folder is compressed. By default, Windows displays the names of compressed files and folders in blue to distinguish them from those that are uncompressed. To control whether Windows display compressed files and folders in a different color, use the following steps:

This HQL statement (or JPA QL statement, if executed with the EntityManager) looks like an SQL statement. However, it uses an entity name (class name) and a property name. It s also integrated into Hibernate s parameter binding API. The number of updated entity objects is returned not the number of updated rows. Another benefit is that the HQL (JPA QL) UPDATE statement works for inheritance hierarchies:

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Query q = session.createQuery( "update CreditCard set stolenOn <= :now where type = 'Visa'" ); q.setTimestamp("now", new Date() ); int updatedCreditCards = q.executeUpdate();

1. In Windows Explorer, click the Tools menu, and then click Folder Options. 2. In the Folder Options dialog box, on the View tab, clear or select the Show Encrypted Or Compressed Files In Color check box.

When you clear the Show Encrypted Or Compressed Files In Color check box, Windows will no longer show compressed or encrypted files in color. There is no way to disable the color display of just-compressed or just-encrypted files.

The persistence engine knows how to execute this update, even if several SQL statements have to be generated; it updates several base tables (because CreditCard is mapped to several superclass and subclass tables). This example also doesn t contain an alias for the entity class it s optional. However, if you use an alias, all properties must be prefixed with an alias. Also note that HQL (and JPA QL) UPDATE statements can reference only a single entity class; you can t write a single statement to update Item and CreditCard objects simultaneously, for example. Subqueries are allowed in the WHERE clause; any joins are allowed only in these subqueries. Direct DML operations, by default, don t affect any version or timestamp values of the affected entities (this is standardized in Java Persistence). With HQL, however, you can increment the version number of directly modified entity instances:

There are rules that determine whether the compression state of files and folders is retained when you copy or move them within and between NTFS and FAT volumes The following list describes how Windows XP Professional treats the compression state of a file or folder when you copy or move a compressed file or folder within or between NTFS volumes or between NTFS and FAT volumes Copying a file within an NTFS volume When you copy a file within an NTFS volume (shown as A in Figure 10-17), the file inherits the compression state of the target folder For example, if you copy a compressed file to an uncompressed folder, the file is automatically uncompressed Moving a file or folder within an NTFS volume When you move a file or folder within an NTFS volume (shown as B in Figure 10-17), the file or folder retains its original compression state.

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