80 lines
2.4 KiB
Python
80 lines
2.4 KiB
Python
# engine/util.py
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# Copyright (C) 2005-2019 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: http://www.opensource.org/licenses/mit-license.php
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from .. import util
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def connection_memoize(key):
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"""Decorator, memoize a function in a connection.info stash.
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Only applicable to functions which take no arguments other than a
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connection. The memo will be stored in ``connection.info[key]``.
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"""
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@util.decorator
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def decorated(fn, self, connection):
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connection = connection.connect()
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try:
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return connection.info[key]
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except KeyError:
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connection.info[key] = val = fn(self, connection)
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return val
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return decorated
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def py_fallback():
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def _distill_params(multiparams, params): # noqa
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r"""Given arguments from the calling form \*multiparams, \**params,
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return a list of bind parameter structures, usually a list of
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dictionaries.
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In the case of 'raw' execution which accepts positional parameters,
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it may be a list of tuples or lists.
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"""
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if not multiparams:
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if params:
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return [params]
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else:
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return []
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elif len(multiparams) == 1:
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zero = multiparams[0]
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if isinstance(zero, (list, tuple)):
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if (
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not zero
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or hasattr(zero[0], "__iter__")
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and not hasattr(zero[0], "strip")
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):
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# execute(stmt, [{}, {}, {}, ...])
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# execute(stmt, [(), (), (), ...])
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return zero
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else:
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# execute(stmt, ("value", "value"))
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return [zero]
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elif hasattr(zero, "keys"):
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# execute(stmt, {"key":"value"})
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return [zero]
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else:
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# execute(stmt, "value")
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return [[zero]]
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else:
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if hasattr(multiparams[0], "__iter__") and not hasattr(
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multiparams[0], "strip"
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):
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return multiparams
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else:
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return [multiparams]
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return locals()
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try:
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from sqlalchemy.cutils import _distill_params # noqa
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except ImportError:
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globals().update(py_fallback())
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