Comparison of the 2 values of forms 6i

Hello world
I have a form where a person types all users that we have in society, but each user id must be typed by this person who will probably in the future insert a code which is already in the database. The id field is not null, but I would like to know how I can add a trigger to compare the value typed with those I have already in the database, so that the user knows that this user id already exists.
Can you guys please help me with this?
Thanks in advance!

There are many ways, you could do that. One way would be to create a trigger when-validate-point on the UserID field that checks the database to see if the value already exists and throw an exception if it exists. For example:

/* When-Validate-Item trigger */
DECLARE
     n_dummy     NUMBER := 0;

     CURSOR test_User_ID IS
          SELECT count(*)
            FROM YOUR_TABLE_NAME_HERE
          WHERE USER_ID = :YOUR_BLOCK_NAME.USER_ID;
BEGIN
     OPEN test_User_ID;
     FETCH test_User_ID INTO n_dummy;
     CLOSE test_User_ID;

     IF ( n_dummy > 0 ) THEN
          MESSAGE('User ID " '||:YOUR_BLOCK_NAME.USER_ID||' " already exists.  Please enter a unique User ID.',ACKNOWLEDGE);
          RAISE Form_Trigger_Failure;
     END IF;
END;

Please understand that this is some code examples and should be modified in order to work on your form. Also note, I am not positive the setting of 'RECOGNITION' to the built-in MESSAGE is valid for Forms 6i. Please confirm before use.

I hope this helps.
Craig...

If I or someone else answer is useful or appropriate, please mark accordingly

Tags: Oracle Development

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