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The Storage\Drives\ page, shown in Figure 1-10, lists the hard disks in the system, their capacities, and the amount of free space available. Selecting View\Remote Computer\ enables you to connect to another system on the network and view its system information as well.

The result of this query is a List of Object[]s, effectively a table. Each field in each array is of scalar type that is, a string, a number, or a timestamp. Except for the wrapping in an Object[], the result is exactly the same as that of a similar plain JDBC query. This is obviously not too useful, but one benefit of the Hibernate API is that it throws unchecked exceptions so you don t have to wrap the query in try/catch block as you have to if you call the JDBC API. If you aren t projecting everything with *, you need to tell Hibernate what scalar values you want to return from your result:

802.11 standards include the following:

802.11b, which offers data transfer rates of 5.5 Mbps and 11 Mbps, and operates in the 2.45 GHz radio frequency. 802.11a, which offers data transfer rates up to 54 Mbps and operates in the 5.8 GHz frequency. 802.11g, which offers data transfer rates up to 54 Mbps and operates in the 2.4 GHz frequency. Ad-hoc wireless networking, in which there are multiple stations but no AP. Ad-hoc wireless networks are technically known as independent basic service sets. Infrastructure wireless networking, in which stations connect to an AP. Infrastructure wireless networks are technically known as basic service sets. Basic service sets can be network together to create extended service sets.

session.createSQLQuery("select u.FIRSTNAME as fname from USERS u") .addScalar("fname");

Windows XP Professional can operate in two wireless networking modes:

You can protect wireless networks in the following ways:

The addScalar() method tells Hibernate that your fname SQL alias should be returned as a scalar value and that the type should be automatically guessed. The query returns a collection of strings. This automatic type discovery works fine in most cases, but you may want to specify the type explicitly sometimes for example, when you want to convert a value with a UserType:

By filtering MAC addresses so that only specified computers can connect to an AP. By disabling SSID broadcasts so that casual intruders cannot detect the wireless network. By using WEP encryption, which is widely supported but also has widely recognized flaws. By using WPA encryption, which provides stronger encryption than WEP.

Windows XP Professional supports Zero Client Configuration, which means that Windows can automatically detect and connect to wireless networks. For secured networks, you must configure the client to access the network properly, but connection after that configuration is also automatic.

Properties params = new Properties(); params.put("enumClassname", "auction.model.Rating"); session.createSQLQuery( "select c.RATING as rating from COMMENTS c" + " where c.FROM_USER_ID = :uid" ) .addScalar("rating", Hibernate.custom(StringEnumUserType.class, params) ) .setParameter("uid", new Long(123));

15-42

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First, look at the SQL query. It selects the RATING column of the COMMENTS table and restricts the result to comments made by a particular user. Let s assume that this field in the database contains string values, such as EXCELLENT, OK, or BAD. Hence, the result of the SQL query is string values. You d naturally map this not as a simple string in Java but using an enumeration and probably a custom Hibernate UserType. We did this in chapter 5, section 5.3.7, Mapping enumerations, and created a StringEnumUserType that can translate from strings in the SQL database to instances of any enumeration in Java. It must be parameterized with the enumClassname you want it to convert values to auction.model.Rating in this example. By setting the prepared custom type with the addScalar() method on the query, you enable it as a converter that handles the result, and you get back a collection of Rating objects instead of simple strings.