luigi/contrib/mysqldb.py [71:86]:
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    def __str__(self):
        return self.table

    def touch(self, connection=None):
        """
        Mark this update as complete.

        IMPORTANT, If the marker table doesn't exist,
        the connection transaction will be aborted and the connection reset.
        Then the marker table will be created.
        """
        self.create_marker_table()

        if connection is None:
            connection = self.connect()
            connection.autocommit = True  # if connection created here, we commit it here
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luigi/contrib/postgres.py [203:219]:
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    def __str__(self):
        return self.table

    def touch(self, connection=None):
        """
        Mark this update as complete.

        Important: If the marker table doesn't exist, the connection transaction will be aborted
        and the connection reset.
        Then the marker table will be created.
        """
        self.create_marker_table()

        if connection is None:
            # TODO: test this
            connection = self.connect()
            connection.autocommit = True  # if connection created here, we commit it here
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