title: Oracle Apex authorization scheme based on page item value
body: <p>I am currently working in Oracle Apex version 5.1 and I am trying to set up an authorization scheme that is based on the value of a text field page item on page 31 in my application, as well as other factors, but I am not having any success.</p>
  
  <p>I created a dynamic list based on a SQL query from one of my tables called NAVIGATION. I then used this list as my "Navigation Menu" in my application. I set up the query for the list in such a way that if I click on the Navigation Menu tab that directs me to page 31 in the application, the value for the text field page item in question is automatically pushed to that text field. However, I also set up the query for the list in such a way that multiple tabs in the Navigation Menu actually direct the user to page 31, but the value that is pushed to the text field page item depends on the Navigation menu tab that is clicked. In other words, that text field page item can hold different values depending on which tab in the Navigation Menu was clicked. The reason I set it up this way is because different things are displayed on page 31 depending on the value in that text field. That all works perfectly. However, what I want displayed on that page is dependent on who the user is, which brings me to the issue of the authorization scheme.</p>
  
  <p>Now, I want to set up an authorization scheme for page 31 that is dependent on that text field page item, as well as dependent on specific data from one of my tables called TEAMMEMBERS. TEAMMEMBERS has a column called "username" and a column called "P31_Access". The column "username" contains the person's username to get into the application. "P31_Acess" contains the different values that can be pushed to that text field on page 31. So basically what I want is that if I click on one of the tabs in the Navigation Menu that brings me to page 31, I want the application to look in my TEAMMEMBERS table, find my username in the "username" column and then look to see the value in the "P31_Access" column in the same row. If the value in "P31_Access" in that row is the same value of the text field page item on page 31, I am allowed access. Otherwise, no access granted. </p>
  
  <p>I know this seems like a strange way of handling accesses, but setting up authorization schemes for the individual components on the page will not work for my specific situation and need.</p>
  
  <p>This is what I have so far, but it does not produce the result I am looking for.</p>
  
  <pre><code>SELECT 1
  FROM TEAMMEMBERS
  WHERE P31_ACCESS = :P31_ACCESS
  AND upper(username) = upper(:APP_USER);
  </code></pre>
  
  <p>I'm sure there are many problems with my query, but I'm just not sure exactly how to write it. Does anyone have any ideas? I'm wondering if a PLSQL that return a boolean would be a better set up for this authorization scheme, but I'm not sure.</p>
  
  <p>Thank you in advance.</p>