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9851237 @racke unique ordercheck documentation added
racke authored
1 __NAME__ purpose
2 record doesn't exist in a database table
3 __END__
4
5 __NAME__ description
6 This profile checks whether a matching record exists in a database table.
7 It succeeds if there is <emphasis>no</emphasis> such record.
8 __END__
9
10 __NAME__ example: Ensure unique email address
11 <programlisting>
12 email=email_only Please enter a valid email address.
13 &amp;and
14 email=unique userdb:email An account with this email address already exists.
15 </programlisting>
16 __END__
17
18 __NAME__ notes
19 This check doesn't guarantee unique records, as there is a small window of
20 time between performing this check and creating a new record.
21 __END__
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