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Rev 4503 Rev 4547
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        Parameters:
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        Parameters:
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         - purchaseId
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         - purchaseId
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         - itemId
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         - itemId
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        """
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        """
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        purchaseOrderId = Purchase.query.filter_by(id = purchaseId).one().purchaseOrder_id
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        purchaseOrderId = Purchase.query.filter_by(id = purchaseId).one().purchaseOrder_id
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        return LineItem.query.filter_by(purchaseOrder_id = purchaseOrderId).filter_by(itemId = itemId).one().unit_price
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        return LineItem.query.filter_by(purchaseOrder_id = purchaseOrderId).filter_by(itemId = itemId).one().unitPrice
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    def close_session(self):
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    def close_session(self):
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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()