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You can access all printers on a print server by using a Web browser or you can use any of the windows or folders within the Windows XP Professional interface that has an address bar, such as the Printers And Faxes window or Internet Explorer. In the

As you can see, the original queryString is no longer a simple search for a string but also executes a stored procedure in the database! The quote characters aren t escaped; hence the call to the stored procedure is another valid expression in the query. If you write a query like this, you open up a major security hole in your application by allowing the execution of arbitrary code on your database. This is known as an SQL injection security issue. Never pass unchecked values from user input to the database! Fortunately, a simple mechanism prevents this mistake. The JDBC driver includes functionality for safely binding values to SQL parameters. It knows exactly what characters in the parameter value to escape, so that the previous vulnerability doesn t exist. For example, the quote characters in the given search are escaped and are no longer treated as control characters but as a part of the search string value. Furthermore, when you use parameters, the database is able to efficiently cache precompiled prepared statements, improving performance significantly. There are two approaches to parameter binding: using positional or using named parameters. Hibernate and Java Persistence support both options, but you can t use both at the same time for a particular query. With named parameters, you can rewrite the query as

Administering Printers by Using a Web Browser 12-27

Address text box, type http://print_server_name/printers. This command displays a page listing all the printers on the print server, as shown in Figure 12-9. Click the name of the printer that you want to use. When you are on that printer s page, under Printer Actions, click Connect to connect to the printer. Windows XP automatically copies the appropriate printer drivers to your computer and adds an icon for the printer to the Printers And Faxes window.

String queryString = "from Item item where item.description like :search";

Figure 12-9

a. You can publish a package to users, but not to computers. B. You can publish a package to computers, but not to users. c. You can publish a package to both computers and users. D. You can publish a package to neither computers nor users.

If you want to gain access to a specific printer by using a Web browser, open the Web browser, and then in the Address text box, type http://server_name/ printer_share_name. You are directed to that printer s page. Under Printer Actions, click Connect to connect to the printer. From the printer s URL page, you can view information about the printer, such as its model, its location, and the number of documents waiting to print. You can manage any document you have sent to the printer, and if you have the Manage Printers permission for the printer, you can also pause or resume operation of the printer.

The colon followed by a parameter name indicates a named parameter. Then, bind a value to the search parameter:

Use the following questions to help determine whether you have learned enough to move on to the next lesson. If you have difficulty answering these questions, review the material in this lesson before beginning the next lesson. You can find answers to these questions in the Questions and Answers section at the end of this chapter. 1. If you are using a computer running Windows XP Professional as your print server, users can gain access to the printers on it by using a Web browser only if the print server has ________________________________ installed. Fill in the blank.

12-28

Query q = session.createQuery(queryString) .setString("search", searchString);

12

3. Can you pause and resume operation of a printer that you have used Internet Explorer to connect to