Calling PLSQL Stored Procedure From HTML Form Submit Button

Hi there,
I am having a little difficulty with calling a stored procedure using an html form button. Here is the code I have right now...
HTP.PRINT('<form action=ZWGKERCF.P_confdelete>');
HTP.PRINT('<input type=''submit'' value='' Yes '' onClick=''document.getElementById("mypopup").style.display="none"''>');
HTP.PRINT('</form></div>');Here is the issue - I need to find a way to pass variables to this stored procedure so it know what data to operate on. This stored procedure will delete data for a specific database record and I must pass three variables to this procedure to make it work.
Lets call them class_number, term, conf These three variables will be passed and the data will be deleted and the person will see a confirmation screen once the delete query has been executed.
So ideally I would want: ZWGKERCF.P_confdelete(class_number, term, conf) and then the stored procedure would handle the rest!
Seems pretty simple but I am not sure how to make this happen... My thoughts were:
Pass the data to this html form (the three fields I need) in hidden variables. Then somehow pass these using POST method to the procedure and read using GET?
Can someone clarify what the best way to do this is? I have a feeling its something small I am missing - but I would really like some expert insight :-)
Thanks so much in advance!
- Jeff

795018 wrote:
I am having a little difficulty with calling a stored procedure using an html form button. Here is the code I have right now...
HTP.PRINT('<form action=ZWGKERCF.P_confdelete>');
HTP.PRINT('<input type=''submit'' value='' Yes '' onClick=''document.getElementById("mypopup").style.display="none"''>');
HTP.PRINT('</form></div>');Here is the issue - I need to find a way to pass variables to this stored procedure so it know what data to operate on. This stored procedure will delete data for a specific database record and I must pass three variables to this procedure to make it work. The browser generates a POST or a GET for that form action, that includes all the fields defined in that form. Let's say you define HTML text input fields name and surname for the form. The URL generated for that form's submission will be:
http://../ZWGKERCF.P_confdelete?name=value1&surname=value2The browser therefore submits the values of the form as part of the URL.
The web server receives this. It sees that the base URL (aka location) is serviced by Oracle's mod_plsql. It passes the URL to this module. This module builds a PL/SQL block and makes the call to Oracle. If we ignore the additional calls it makes (setting up an OWA environment for that Oracle session), this is how the call to Oracle basically looks like:
begin
  ZWGKERCF.P_confdelete( name=> :value1, surname =>  :value2 );
end;Thus the PL/SQL web enabled procedure gets all the input fields from the HTML form, via its parameter signature. As you can define parameter values with defaults, you can support variable parameter calls. For example, let's say our procedure also have a birthDate parameter that is default null. The above call will still work (from a HTML form that does not have a date field). And so will the following URL and call that includes a birth date:
URL:
http://../ZWGKERCF.P_confdelete?name=value1&surname=value2&birthdate=2000/01/01
PL/SQL call:
begin
  ZWGKERCF.P_confdelete( name=> :value1, surname =>  :value2, birthdate => :value3 );
end;There is also another call method you can use - the flexible 2 parameter interface. In this case the PL/SQL procedure name in the URL is suffixed with an exclamation mark. This instructs the mod_plsql module to put all input field names it received from the web browser into a string array. And put all the values for those fields in another string array. Then it calls your procedure with these arrays as input.
Your procedure therefore has a fixed parameter signature. Two parameters only. Both are string arrays.
The advantage of this method is that your procedure can dynamically deal with the web browser's input - any number of fields. The procedure's signature no longer needs to match the HTML form's signature.
You can also defined RESTful mod_plsql calls to PL/SQL. In which case the call format from the web browser looks different and is handled differently by mod_plsql.
All this (and more) is detailed in the Oracle manuals dealing with mod_plsql - have a search via http://tahiti.oracle.com (Oracle Documentation Portal) for the relevant manuals for the Oracle version you are using.
Alternatively, simply download and install Oracle Apex (Application Express). This is a web development and run-time framework and do all the complexities for you - including web state management, optimistic locking, security and so on.

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