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# engine/util.py # Copyright (C) 2005-2020 the SQLAlchemy authors and contributors # <see AUTHORS file> # # This module is part of SQLAlchemy and is released under # the MIT License: http://www.opensource.org/licenses/mit-license.php from .. import util def connection_memoize(key): """Decorator, memoize a function in a connection.info stash. Only applicable to functions which take no arguments other than a connection. The memo will be stored in ``connection.info[key]``. """ @util.decorator def decorated(fn, self, connection): connection = connection.connect() try: return connection.info[key] except KeyError: connection.info[key] = val = fn(self, connection) return val return decorated def py_fallback(): def _distill_params(multiparams, params): # noqa r"""Given arguments from the calling form \*multiparams, \**params, return a list of bind parameter structures, usually a list of dictionaries. In the case of 'raw' execution which accepts positional parameters, it may be a list of tuples or lists. """ if not multiparams: if params: return [params] else: return [] elif len(multiparams) == 1: zero = multiparams[0] if isinstance(zero, (list, tuple)): if ( not zero or hasattr(zero[0], "__iter__") and not hasattr(zero[0], "strip") ): # execute(stmt, [{}, {}, {}, ...]) # execute(stmt, [(), (), (), ...]) return zero else: # execute(stmt, ("value", "value")) return [zero] elif hasattr(zero, "keys"): # execute(stmt, {"key":"value"}) return [zero] else: # execute(stmt, "value") return [[zero]] else: if hasattr(multiparams[0], "__iter__") and not hasattr( multiparams[0], "strip" ): return multiparams else: return [multiparams] return locals() try: from sqlalchemy.cutils import _distill_params # noqa except ImportError: globals().update(py_fallback())