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From "Bernt M. Johnsen (JIRA)" <j...@apache.org>
Subject [jira] Created: (DERBY-2591) DataDictionaryImpl.getSystemSQLName() may generate duplicates
Date Wed, 25 Apr 2007 13:40:15 GMT
DataDictionaryImpl.getSystemSQLName() may generate duplicates

                 Key: DERBY-2591
                 URL: https://issues.apache.org/jira/browse/DERBY-2591
             Project: Derby
          Issue Type: Bug
          Components: SQL
            Reporter: Bernt M. Johnsen
         Assigned To: Bernt M. Johnsen

DataDictionaryImpl.getSystemSQLName() may generates names on the form SQLYYMMDDHHMMSSmmN where
mm is in 10 milliseconds and N is number to avoid collisions with 10 milliseconds. The name
was probably generated this way to fit into the 18 caharcter limit of constraint names in
older derby versions. However, if a getSystemSQLName() is called 12 hours after a call on
the same date (e.g at 01:00:00 and 13:00:00), which is unlikely but not very unlikely, a duplicate
name is generated, since the HH-part is filled by the call
and Calendar.HOUR implementes the pretty stupid idea that there are only 12 hours. It was
definitely Calendar.HOUR_OF_DAY which gives you the hour for a 24-hour clock that should have
been used. 

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