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# engine/util.py
# Copyright (C) 2005-2012 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 _coerce_config(configuration, prefix):
"""Convert configuration values to expected types."""
options = dict((key[len(prefix):], configuration[key])
for key in configuration
if key.startswith(prefix))
for option, type_ in (
('convert_unicode', util.bool_or_str('force')),
('pool_timeout', int),
('echo', util.bool_or_str('debug')),
('echo_pool', util.bool_or_str('debug')),
('pool_recycle', int),
('pool_size', int),
('max_overflow', int),
('pool_threadlocal', bool),
('use_native_unicode', bool),
):
util.coerce_kw_type(options, option, type_)
return options
def _distill_params(multiparams, params):
"""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]
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
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