database.py 文件源码

def view_sample(self, sample_id):
        """Retrieve information on a sample given a sample id.
        @param sample_id: ID of the sample to query.
        @return: details on the sample used in sample: sample_id.
        """
        session = self.Session()
        try:
            sample = session.query(Sample).get(sample_id)
        except AttributeError:
            return None
        except SQLAlchemyError as e:
            log.debug("Database error viewing task: {0}".format(e))
            return None
        else:
            if sample:
                session.expunge(sample)
        finally:
            session.close()

        return sample