User defined error handling in PLSQL procedure of portal form

Question

I need some help of building a user defined exception handling in PLSQL.
I build a portal form based on a PLSQL procedure.
In this procedure there are several SQL statements with exception handling.
In case of exception I want to display my on error message and than raise the procedure, so that the user can read the message and than go back to form.
I try this by calling a raise statement generating some HTML output over htp.p() but than the output look's like
SQL:
begin
"ACHEMA2003"."P_LOGIN" ( P_STAMM_SEQ => 33491, P_ADRESSNR => 2009721, P_PASSWORD => '3333', P_PROJEKT_ID => 'ACHEMA2003', P_MESSENR => '00023', P_SPKZ => 'D');
end;
ORA-20000:
Login ACHEMA 2003
Ung|ltiges Passwort !!!
Back to form
I want to supress the standard Oracle messages.
Now I read about the packages wwerr_api_error and wwerr_api_error_ui to make this, but it seems to be a little difficult.
Is there anybody who have a solution for this problem, perhaps some example PLSQL code for this.
Thanks Erwin.

Answer 1

Jacob,
Try following:
declare
v_sender VARCHAR2(1000);
v_sender_id NUMBER;
begin
v_sender := p_session.get_value_as_VARCHAR2(
p_block_name => 'DEFAULT',
p_attribute_name => 'A_SENDER');
v_sender_id := p_session.get_value_as_NUMBER(
p_block_name => 'DEFAULT',
p_attribute_name => 'A_SENDER_ID');
insert into hd (number, text) values (hd_seq.nextval,
'step 3 v_sender = ' || v_sender ||
' v_sender_id = ' || v_sender_id);
if v_sender_id >= 100 then
p_session.set_value(
p_block_name => "_block",
p_attribute_name => '_STATUS',
p_value => 'Sender ID must be less than 100!');
-- return to your form with status message set
-- and all fields filled with recent values
return;
end if;
end;
-- This point is reached only if validation is OK
doInsert;
Regards,
Henn