def delete_dag(dag_id, keep_records_in_log=True, session=None):
    """
    :param dag_id: the dag_id of the DAG to delete
    :type dag_id: str
    :param keep_records_in_log: whether keep records of the given dag_id
        in the Log table in the backend database (for reasons like auditing).
        The default value is True.
    :type keep_records_in_log: bool
    """
    DM = models.DagModel
    dag = session.query(DM).filter(DM.dag_id == dag_id).first()
    if dag is None:
        raise DagNotFound("Dag id {} not found".format(dag_id))

    if dag.fileloc and os.path.exists(dag.fileloc):
        raise DagFileExists("Dag id {} is still in DagBag. "
                            "Remove the DAG file first: {}".format(dag_id, dag.fileloc))

    count = 0

    # noinspection PyUnresolvedReferences,PyProtectedMember
    for m in models.base.Base._decl_class_registry.values():
        if hasattr(m, "dag_id"):
            if keep_records_in_log and m.__name__ == 'Log':
                continue
            cond = or_(m.dag_id == dag_id, m.dag_id.like(dag_id + ".%"))
            count += session.query(m).filter(cond).delete(synchronize_session='fetch')

    if dag.is_subdag:
        p, c = dag_id.rsplit(".", 1)
        for m in models.DagRun, TaskFail, models.TaskInstance:
            count += session.query(m).filter(m.dag_id == p, m.task_id == c).delete()

    return count
def delete_dag(dag_id, keep_records_in_log=True, session=None):
    """
    :param dag_id: the dag_id of the DAG to delete
    :type dag_id: str
    :param keep_records_in_log: whether keep records of the given dag_id
        in the Log table in the backend database (for reasons like auditing).
        The default value is True.
    :type keep_records_in_log: bool
    """
    DM = models.DagModel
    dag = session.query(DM).filter(DM.dag_id == dag_id).first()
    if dag is None:
        raise DagNotFound("Dag id {} not found".format(dag_id))

    if dag.fileloc and os.path.exists(dag.fileloc):
        raise DagFileExists("Dag id {} is still in DagBag. "
                            "Remove the DAG file first: {}".format(dag_id, dag.fileloc))

    count = 0

    # noinspection PyUnresolvedReferences,PyProtectedMember
    for m in models.base.Base._decl_class_registry.values():
        if hasattr(m, "dag_id"):
            if keep_records_in_log and m.__name__ == 'Log':
                continue
            cond = or_(m.dag_id == dag_id, m.dag_id.like(dag_id + ".%"))
            count += session.query(m).filter(cond).delete(synchronize_session='fetch')

    if dag.is_subdag:
        p, c = dag_id.rsplit(".", 1)
        for m in models.DagRun, TaskFail, models.TaskInstance:
            count += session.query(m).filter(m.dag_id == p, m.task_id == c).delete()

    return count
def delete_dag ( dag_id , keep_records_in_log = True , session = None ) : DM = models . DagModel dag = session . query ( DM ) . filter ( DM . dag_id == dag_id ) . first ( ) if dag is None : raise DagNotFound ( "Dag id {} not found" . format ( dag_id ) ) if dag . fileloc and os . path . exists ( dag . fileloc ) : raise DagFileExists ( "Dag id {} is still in DagBag. " "Remove the DAG file first: {}" . format ( dag_id , dag . fileloc ) ) count = 0 # noinspection PyUnresolvedReferences,PyProtectedMember for m in models . base . Base . _decl_class_registry . values ( ) : if hasattr ( m , "dag_id" ) : if keep_records_in_log and m . __name__ == 'Log' : continue cond = or_ ( m . dag_id == dag_id , m . dag_id . like ( dag_id + ".%" ) ) count += session . query ( m ) . filter ( cond ) . delete ( synchronize_session = 'fetch' ) if dag . is_subdag : p , c = dag_id . rsplit ( "." , 1 ) for m in models . DagRun , TaskFail , models . TaskInstance : count += session . query ( m ) . filter ( m . dag_id == p , m . task_id == c ) . delete ( ) return count
:param dag_id: the dag_id of the DAG to delete
    :type dag_id: str
    :param keep_records_in_log: whether keep records of the given dag_id
        in the Log table in the backend database (for reasons like auditing).
        The default value is True.
    :type keep_records_in_log: bool
: param dag_id : the dag_id of the DAG to delete : type dag_id : str : param keep_records_in_log : whether keep records of the given dag_id in the Log table in the backend database ( for reasons like auditing ) . The default value is True . : type keep_records_in_log : bool