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Let s use the report on the EMPLOYEES table as an example Figure 12-4 shows the same page as it appears for two different users The user Robert Smith passes the authorization scheme, while user Kathy Evans does not The authorization scheme was applied to the Salary and edit link columns of the report, the Create button, and the Search text box As you can see, those elements simply do not appear for Kathy Evans There are several scenarios in which reusing the logic of an authorization scheme is desirable, yet the declarative attribute is not present For example, let s say we want to have sensitive items show up as read-only for anyone who is not an administrator This simply isn t possible with the authorization scheme attribute of an item, as that attribute would completely hide the item for non-administrators, not simply show it as read-only If the logic for who is considered an administrator is already defined in an authorization scheme, we can leverage that logic by calling the APEX_UTILPUBLIC_CHECK_AUTHORIZATION API This API accepts the case-sensitive name of an authorization scheme and returns a Boolean, true, if the current user passes the authorization scheme, and false if he or she fails the authorization scheme So, if we have an authorization scheme named IsAdmin, we can set the read-only attribute of one or more items to PL/SQL Function Body Returning a Boolean and enter the following code in the Expression 1 attribute:

When your script requires the user to choose a URL to which to connect, use the choose URL command This command displays a dialog box that enables the user to either select a URL from a list you present to them or type a URL of his or her choosing Your script can then use this URL as necessary Mac OS X doesn t open a browser window to the URL automatically when the user dismisses the Choose URL dialog box If you use the choose URL command on its own, without any parameters, it displays a dialog box showing available file servers on the network to which your Mac is attached (see Figure 8-26) These are any Macs or other computers configured to offer file services on the network In most cases, you ll want to add the showing parameter with one of the items explained in Table 8-3 Normally, the Server Address box at the top of the Choose URL dialog box is enabled so the user can type in a URL that doesn t appear in the list box (Or, if the user is feeling ornery, he or she user can type in one of the listed URLs) You can disable the Server Address box by adding the parameter without editable URL to the choose URL command The box then appears without a black outline around it a visual distinction subtle enough to be lost on many users, who will try to click in the box anyway The following example displays the Choose URL dialog box showing file servers and then mounts the chosen server using the open location command:

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Video tape 533 Recently, however, compact disks (CDs) have begun to displace magnetic tape for the recording of speech and music Magnetic tape has millions of iron-oxide or other ferromagnetic particles on a mylar film In the recording process, a signal is applied to coils in the recording head The recording head is an electromagnet It polarizes the particles on the tape as the tape moves by (Fig 28-9) The particles hold tiny magnetic fields until they are changed by rerecording When the tape is played back, the movement of magnetic fields past the pickup head generates a fluctuating current in a small coil; this current replicates the original recorded signal

return apex_utilpublic_check_authorization('IsAdmin');

open location (choose URL showing File servers)

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