Date: 2013-03-07 06:48:19 +0000 (Thu, 07 Mar 2013)
Cleanup: Database connection and resource release
Setting variable to null within a helper method doesn't affect anything,
as it's only a reference located on the stack that is nulled.
It's been invalidated nevertheless immediately after the method is left.
Instead 'null' the reference where the object has initially been
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