luigi/contrib/mssqldb.py [65:85]:
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        self.database = database
        self.user = user
        self.password = password
        self.table = table
        self.update_id = update_id

    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()
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luigi/contrib/postgres.py [197:218]:
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        self.database = database
        self.user = user
        self.password = password
        self.table = table
        self.update_id = update_id

    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()
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