Checking For User Permissions Before Updating or Inserting The Records in Oracle Forms

Suppose you want to check the user permissions on inserting or updating the records in Oracle Forms, then you can use Pre-Insert and Pre-Update triggers for that particular data block to check whether user is having proper permission or not.

 

The example is given for HR schema and the following demo table is created for this:

 

Create Table User_Permissions (User_Name varchar2(50) Primary Key,

Can_Insert Varchar2(1) default 'N',

Can_Update Varchar2(1) default 'N')

 

Insert into User_Permissions values ('FORMUSER1', 'Y', 'N');

 

Commit;

 

Below is the screen shot for the examle:

 

 

You can download this form from the following link: Pre-Update-Insert.fmb

 

The following is the code written in Pre-Update trigger to check the permissions from the database:

 

Declare

n_allow number;

begin

Select 1 into n_allow

   from hr.user_permissions

   where user_name = 'FORMUSER1'

   and can_update = 'Y';

   --- all is well if no exception raised else stop in exception area

   exception

     when others then

        message('You have no permission to update the record.');

        message('You have no permission to update the record.');

        raise form_trigger_failure;

end;

 

The following is the code written in Pre-Insert trigger to check the permissions from the database on Insert:

 

Declare
n_allow number;
begin
Select 1 into n_allow
   from hr.user_permissions
   where user_name = 'FORMUSER1'
   and can_insert = 'Y';
   --- all is well if no exception raised else stop in exception area

   exception
     when others then
        message('You have no permission to insert the record.');
        message('You have no permission to insert the record.');
        raise form_trigger_failure;
       
end;

The code is written for Save button:

Commit_form;