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Figure 4-2. Everyone is allowed to see the Create button in the Buglist application. Let s say that you want to show the Create button only to users who are designated as administrators. First, in the user_repository table, you need to identify which users are administrators. You can do that by adding a new column to hold an admin flag, as shown in Listing 4-1. Listing 4-1. Adding an admin Flag to the user_repository Table apexdemo@10gR2> desc user_repository; Name Null Type --------------------- -------- ---------------USERNAME NOT NULL VARCHAR2(8) FORENAME VARCHAR2(30) SURNAME VARCHAR2(30) EMAIL VARCHAR2(50) PASSWORD_HASH RAW(16) LOCKED_FLAG NOT NULL CHAR(1) VERIFIED NOT NULL CHAR(1) -- add the new column apexdemo@10gR2> alter table user_repository 2 add(admin char(1) default 'N'); Table altered.

Package Groups mode YaST 520 packet receive buffers 164 PAM (Pluggable Authentication Modules) 99, 329 introduction 329 330 required local components 330 333 pam_nam module 331 parameters Apache Manager parameters 607 cache parameters 295 296 performance-related Apache parameters 612 partition.TREENAME. 559 Partitioning option Installation Settings screen, OES - Linux 1 CD 29 partitions creating 248 249 managing 247 merging 251 moving 250 PassSync utility 690 passwd command 107 Password Restrictions option iManager tool 315 settings 315 316 Passwords option iManager tool 315, 340 pause command 354 permissions, Linux 125 assigning permissions with chmod 129 132 file ownership 127 setting default permissions with umask 132 133

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-- modify the existing records so that 'peterw' is an administrator apexdemo@10gR2> update user_repository 2 set admin = 'Y' where username = 'peterw'; 1 row updated apexdemo@10gR2> update user_repository 2 set admin = 'N' where username <> 'peterw'; 3 rows updated apexdemo@10gR2> commit; Commit complete -- add a not null constraint to the new column apexdemo@10gR2> alter table user_repository 2 modify admin not null; Table altered -- add a check constraint to the column apexdemo@10gR2> alter table user_repository 2 add constraint admin_yn check (admin in ('Y','N')); Table altered Next, you need to check whether the user currently logged in to the application is an administrator, which will determine whether that user sees the Create button.

types of permissions 128 129 users and groups 125 127 Persistent Cookies option iManager File Access 393 phaser program NSNSHELL 149 PKI (Public Key Infrastructure) 503 504 secure communication 679 placement rules 656 policies 674 Pluggable Authentication Modules. See PAM Policy path and filename Advanced Login tab, Novell Client 180 pools command 729 Portal tab Virtual Office administration interface 635 Prepare A Server For Upgrade option Deployment Manager 14 Prepare for New eDirectory option Deployment Manager 13 Print Queue leaf object 238 Printer Banner Configuration option iManager tool 598 printer maps, creating 590 592 Printer Pool Configuration option iManager tool 599 printers accessing from Linux workstation 593 accessing from Windows workstation 593 configuring 588 590 managing from iManager 595 596 printing 7 proc directory 101 process management, Linux terminating processes 124 125 viewing process activity 122

In essence, you want to check whether a row exists in the user_repository table where the username is the same as the logged-in user and the admin flag is set to 'Y', as shown by the query in Listing 4-2 Listing 4-2 Query to Determine If the Current User Is an Administrator select 1 from user_repository where upper(username) = :APP_USER and admin = 'Y' You might wonder about the select 1 used in this query You need to select something to return to the outer query, because the query is actually being used as an exists subquery You could select the username or any other column or constant you preferred; however, doing a select 1 is a very common convention that you should follow, unless you have specific reasons not to use this convention.

If all the developers are working on the same code, as is the case with collective code ownership, you don t want them changing the code appearance to suit their individual styles. This would be a tremendous waste of time. So, by agreeing on a coding standard at the beginning of the project, you will increase the productivity and communications of the team.

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