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"""Miscellaneous goodies for psycopg2
This module is a generic place used to hold little helper functions
and classes untill a better place in the distribution is found.
"""
# psycopg/extras.py - miscellaneous extra goodies for psycopg
#
# Copyright (C) 2003-2004 Federico Di Gregorio <fog@debian.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 2, or (at your option) any later
# version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY
# or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
# for more details.
from psycopg2.extensions import cursor as _cursor
from psycopg2.extensions import connection as _connection
from psycopg2.extensions import register_adapter as _RA
from psycopg2.extensions import adapt as _A
class DictConnection(_connection):
"""A connection that uses DictCursor automatically."""
def cursor(self):
return _connection.cursor(self, cursor_factory=DictCursor)
class DictCursor(_cursor):
"""A cursor that keeps a list of column name -> index mappings."""
__query_executed = 0
def execute(self, query, vars=None, async=0):
self.row_factory = DictRow
self.index = {}
self.__query_executed = 1
return _cursor.execute(self, query, vars, async)
def callproc(self, procname, vars=None):
self.row_factory = DictRow
self.index = {}
self.__query_executed = 1
return _cursor.callproc(self, procname, vars)
def _build_index(self):
if self.__query_executed == 1 and self.description:
for i in range(len(self.description)):
self.index[self.description[i][0]] = i
self.__query_executed = 0
def fetchone(self):
res = _cursor.fetchone(self)
if self.__query_executed:
self._build_index()
return res
def fetchmany(self, size=None):
res = _cursor.fetchmany(self, size)
if self.__query_executed:
self._build_index()
return res
def fetchall(self):
res = _cursor.fetchall(self)
if self.__query_executed:
self._build_index()
return res
class DictRow(list):
"""A row object that allow by-colun-name access to data."""
def __init__(self, cursor):
self._index = cursor.index
self[:] = [None] * len(cursor.description)
def __getitem__(self, x):
if type(x) != int:
x = self._index[x]
return list.__getitem__(self, x)
def items(self):
res = []
for n, v in self._index.items():
res.append((n, list.__getitem__(self, v)))
return res
def keys(self):
return self._index.keys()
def values(self):
return tuple(self[:])
def has_key(self, x):
return self._index.has_key(x)
def get(self, x, default=None):
try:
return self[x]
except:
return default
class SQL_IN(object):
"""Adapt any iterable to an SQL quotable object."""
def __init__(self, seq):
self._seq = seq
def getquoted(self):
# this is the important line: note how every object in the
# list is adapted and then how getquoted() is called on it
qobjs = [str(_A(o).getquoted()) for o in self._seq]
return '(' + ', '.join(qobjs) + ')'
__str__ = getquoted
_RA(tuple, SQL_IN)
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