Text item validation into Formular.

hi.
From some days I have written my fiirst application using Oracle Forms6i.
In oracle9i I created table USER with column id_user number(5), username varchar2(10) and passwd varchar2(12).
In oracle forms builder I created the formular with 4 controls(2 fields - username and passwd ,one button to login user and Text item to the botton of this formular to print message for user). In ProperPalette for Text item 'username' and 'passwd' I set adequately Maximum Lenght peperty to 10 and 12(for 'passwd' field) and Required to Yes.
Then I wanted to make a validation username and passwd fields in this way, that the user can put in 'username' field the string with length between 8 to 10 and for 'passwd' between 8 to 12 and checking all other cases incorrect data entering by login user.
I created trigger WHEN-MOUSE-CLICK for button with this body:
declare
     dlug_username number;
     dlug_passwd number;
begin
     dlug_username := length(:user_data_log.username);
     dlug_passwd := length(:user_data_log.passwd);
     if (:user_data_log.username = NULL and :user_data_log.passwd = NULL) then
          :user_data_log.komunikaty_logowania := 'you didn enter any data!';
     elsif dlug_username >= 8 and dlug_passwd >= 8 then
     :user_data_log.komunikaty_logowania := 'Correct data!';
     elsif dlug_username < 8 or dlug_passwd < 8 then
               :user_data_log.komunikaty_logowania := 'Fields USERNAME i PASSWD must have more then 8 sign. Correct them!';
               :user_data_log.username := '';
               :user_data_log.passwd := '';
     end if;
exception
     when VALUE_ERROR then
     :user_data_log.komunikaty_logowania := dlug_username;
end;
When I run this form by Run Form client/server button, it's not matter what I'll enter in two field 'username', 'passwd', when I press button always is invoke exception section
but no if condition.
Now, I don't know what do with this. What is the best way to resolve problems with validation of form elements?
Thanks in advance for all help, some hints, tutorials. I appologise for so long post, but I
want directly describe my problem. Thanks.

Hi,
Regarding to your post and your problem , obviously the code doesn't go into the
IF condition and validate it becouse the syntax is not appropriate and every time it goes to the IF it jumps into the exception part. Thats why you have to correct your code as fllowing.
if (:user_data_log.username IS NULL) and (:user_data_log.passwd IS NULL) then
etc till the end of the code.
Kindly if this approach meet your requirment of solving , update your problem with a Subject of Solved
Regards
Omar

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