Validation of a form field value against existing values in database tables - urgent.

Question

Hi,
I have created a "form based on a table". Is there a way of validating the fields entered by checking that they are valid values existing on another table in the database? So if they are not valid values, the data would not be inserted and an error would be flagged to the user.
I have not yet been able to find any questions on this forum which deal with this exactly.
Thanks,
Steve.

Answer 1

On Insert button try following (change to your requirement),
declare
usr_id varchar2(100) := portal30.wwctx_api.get_user;
usr_name varchar2(100);
my_deptno number(10);
begin
my_deptno := p_session.get_value_as_NUMBER(
p_block_name => 'DEFAULT',
p_attribute_name => 'A_DEPTNO');
usr_name := null;
begin
select ename
into usr_name
from emp
where dept=my_deptno;
exception
when others then null;
end;
if usr_name is null
then
htp.p('<script> alert("Dept wrong"); </script>');
else
doInsert;
end if;
end;