Update with the duplicate record

Question

I am working on my update page and I ran into the problem
where it allows updating the duplicated record. My code is working
for the second time when I tried to update the same name.
For example, I have the username A, B and C from the
database.
First time: Update username from B to A. It allowed me to do
it since there is username A already in the table. (NOT RIGHT)
Second time: Update username from C to A. It stopped me due
to duplicated record
NOT QUITE RIGHT, IT SHOULD BE STOPPED ME AT THE FIRST TIME??
Thanks

Answer 1

You probably should change the first query so it doesn't
consider a row with the same id:
<cfquery name="get_dupecheck" datasource="#ds#">
select user_name
from users
where trim(user_name) ='#trim(form.user_name)#'
and user_id !=#user_id#
</cfquery>
If any rows are returned from get_dupecheck then you don't
want to do the update.
<cfif get_dupecheck.RecordCount gt 0>