Order delete statements before insert statements when committing changes to the 
database
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                 Key: CAY-1289
                 URL: https://issues.apache.org/jira/browse/CAY-1289
             Project: Cayenne
          Issue Type: Bug
          Components: Cayenne Core Library
    Affects Versions: 3.0M6
         Environment: Java 1.6, Windows XP, JBoss
            Reporter: Patrick Mayweg


When committing changes to the database, the delete statements should be 
excuted before the insert statements. 
We often remove old objects and create new objects for the same unique key 
values. 
If the delete statements are not executed before the insert statements, we are 
getting unique key violations from the database.

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