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117 lines
3.3 KiB
Python
117 lines
3.3 KiB
Python
"""Miscellaneous goodies for psycopg2
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This module is a generic place used to hold little helper functions
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and classes untill a better place in the distribution is found.
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"""
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# 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 psycopg2.extensions import cursor as _cursor
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from psycopg2.extensions import connection as _connection
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from psycopg2.extensions import register_adapter as _RA
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from psycopg2.extensions import adapt as _A
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class DictConnection(_connection):
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"""A connection that uses DictCursor automatically."""
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def cursor(self):
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return _connection.cursor(self, cursor_factory=DictCursor)
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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.row_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.__query_executed == 1 and 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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self.__query_executed = 0
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def fetchone(self):
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res = _cursor.fetchone(self)
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if self.__query_executed:
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self._build_index()
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return res
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def fetchmany(self, size=None):
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res = _cursor.fetchmany(self, size)
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if self.__query_executed:
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self._build_index()
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return res
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def fetchall(self):
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res = _cursor.fetchall(self)
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if self.__query_executed:
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self._build_index()
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return res
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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._index = cursor.index
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self[:] = [None] * len(cursor.description)
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def __getitem__(self, x):
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if type(x) != int:
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x = self._index[x]
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return list.__getitem__(self, x)
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def items(self):
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res = []
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for n, v in self._index.items():
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res.append((n, list.__getitem__(self, v)))
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return res
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def keys(self):
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return self._index.keys()
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def values(self):
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return tuple(self[:])
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def has_key(self, x):
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return self._index.has_key(x)
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def get(self, x, default=None):
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try:
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return self[x]
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except:
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return default
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class SQL_IN(object):
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"""Adapt any iterable to an SQL quotable object."""
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def __init__(self, seq):
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self._seq = seq
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def getquoted(self):
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# this is the important line: note how every object in the
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# list is adapted and then how getquoted() is called on it
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qobjs = [str(_A(o).getquoted()) for o in self._seq]
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return '(' + ', '.join(qobjs) + ')'
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__str__ = getquoted
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_RA(tuple, SQL_IN)
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