Doctrine_Collection is a collection of records (see Doctrine_Record). As with records the collections can be deleted and saved using
Doctrine_Collection::delete() and Doctrine_Collection::save() accordingly.
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When fetching data from database with either DQL API (see Doctrine_Query) or rawSql API (see Doctrine_RawSql) the methods return an instance of
Doctrine_Collection by default.
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The following example shows how to initialize a new collection: