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Rev 3355 Rev 3376
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def close_session():
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def close_session():
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    if session.is_active:
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    if session.is_active:
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        print "session is active. closing it."
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        print "session is active. closing it."
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        session.close()
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        session.close()
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def is_alive():
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    try:
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        session.query(Awb.id).limit(1).one()
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        return True
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    except:
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        return False
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