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60 lines
1.9 KiB
Python
60 lines
1.9 KiB
Python
# psycopg/extras.py - miscellaneous extra goodies for psycopg
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#
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# Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by the
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# Free Software Foundation; either version 2, or (at your option) any later
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# version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
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# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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# for more details.
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from psycopg.extensions import cursor as _cursor
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class DictCursor(_cursor):
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"""A cursor that keeps a list of column name -> index mappings."""
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__query_executed = 0
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def execute(self, query, vars=None, async=0):
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self.tuple_factory = DictRow
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self.index = {}
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self.__query_executed = 1
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return _cursor.execute(self, query, vars, async)
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def _build_index(self):
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if self.description:
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for i in range(len(self.description)):
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self.index[self.description[i][0]] = i
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def fetchone(self):
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if self.__query_executed:
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self._build_index()
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return _cursor.fetchone(self)
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def fetchmany(self, size=None):
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if self.__query_executed:
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self._build_index()
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return _cursor.fetchmany(self, size)
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def fetchall(self):
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if self.__query_executed:
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self._build_index()
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return _cursor.fetchall(self)
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class DictRow(list):
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"""A row object that allow by-colun-name access to data."""
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def __init__(self, cursor):
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self._cursor = cursor
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self[:] = [None] * len(cursor.description)
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print cursor, self
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def __getitem__(self, x):
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if type(x) != int:
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x = self._cursor.index[x]
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return list.__getitem__(self, x)
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