[interchange-docs] xmldocs - racke modified refs/unique.ordercheck

[docs at icdevgroup.org]

User:      racke
Date:      2008-03-16 09:36:06 GMT
Added:     refs     unique.ordercheck
Log:
unique ordercheck documentation added

Revision  Changes    Path
1.1                  xmldocs/refs/unique.ordercheck


rev 1.1, prev_rev 1.0
Index: unique.ordercheck
===================================================================
__NAME__ purpose
record doesn't exist in a database table
__END__

__NAME__ description
This profile checks whether a matching record exists in a database table.
It succeeds if there is <emphasis>no</emphasis> such record.
__END__

__NAME__ example: Ensure unique email address
<programlisting>
email=email_only Please enter a valid email address.
&amp;and
email=unique userdb:email An account with this email address already exists.
</programlisting>
__END__

__NAME__ notes
This check doesn't guarantee unique records, as there is a small window of
time between performing this check and creating a new record.
__END__