зеркало из https://github.com/github/vitess-gh.git
51 строка
1.6 KiB
Python
51 строка
1.6 KiB
Python
# Copyright 2019 The Vitess Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from vtdb import dbexceptions
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# A simple class to trap and re-export only variables referenced from
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# the sql statement since bind dictionaries can be *very* noisy. This
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# is a by-product of converting the DB-API %(name)s syntax to our
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# :name syntax.
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class BindVarsProxy(object):
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def __init__(self, bind_vars):
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self.bind_vars = bind_vars
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self.accessed_keys = set()
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def __getitem__(self, name):
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var = self.bind_vars[name]
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self.bind_vars[name]
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self.accessed_keys.add(name)
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if isinstance(var, (list, set, tuple)):
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return '::%s' % name
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return ':%s' % name
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def export_bind_vars(self):
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return dict([(k, self.bind_vars[k]) for k in self.accessed_keys])
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# convert bind style from %(name)s to :name and export only the
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# variables bound.
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def prepare_query_bind_vars(query, bind_vars):
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bind_vars_proxy = BindVarsProxy(bind_vars)
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try:
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query %= bind_vars_proxy
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except KeyError as e:
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raise dbexceptions.InterfaceError(e[0], query, bind_vars)
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return query, bind_vars_proxy.export_bind_vars()
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