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"""Wrapper around psycopg1/2.
Preferred is psycopg2, fallback to psycopg1.
Interface provided is psycopg1:
- dict* methods.
- new columns can be assigned to row.
"""
import sys
__all__ = []
try:
##from psycopg2.psycopg1 import connect as _pgconnect
# psycopg2.psycopg1.cursor is too backwards compatible,
# to the point of avoiding optimized access.
# only backwards compat thing we need is dict* methods
import psycopg2.extensions, psycopg2.extras
from psycopg2.extensions import QuotedString
from sqltools import dbdict
class _CompatRow(psycopg2.extras.DictRow):
"""Make DictRow more dict-like."""
__slots__ = ('_index',)
def __setitem__(self, k, v):
"""Allow adding new key-value pairs.
Such operation adds new field to global _index.
But that is OK, as .description is unchanged, and access
to such fields before setting them should raise exception
anyway.
"""
if type(k) != int:
if k not in self._index:
self._index[k] = len(self._index)
k = self._index[k]
while k >= len(self):
self.append(None)
return list.__setitem__(self, k, v)
def __contains__(self, k):
"""Returns if such row has such column."""
return k in self._index
def copy(self):
"""Return regular dict."""
return dbdict(self.iteritems())
def iterkeys(self):
return self._index.iterkeys()
def itervalues(self):
return list.__iter__(self)
# obj.foo access
def __getattr__(self, k):
try:
return psycopg2.extras.DictRow.__getattr__(self, k)
except AttributeError:
return self[k]
def __setattr__(self, k, v):
if k == "_index":
return psycopg2.extras.DictRow.__setattr__(self, k, v)
else:
self[k] = v
def __delattr__(self, k):
raise Exception("del not supported for DictRow")
class _CompatCursor(psycopg2.extras.DictCursor):
"""Regular psycopg2 DictCursor with dict* methods."""
def __init__(self, *args, **kwargs):
psycopg2.extras.DictCursor.__init__(self, *args, **kwargs)
self.row_factory = _CompatRow
dictfetchone = psycopg2.extras.DictCursor.fetchone
dictfetchall = psycopg2.extras.DictCursor.fetchall
dictfetchmany = psycopg2.extras.DictCursor.fetchmany
class _CompatConnection(psycopg2.extensions.connection):
"""Connection object that uses _CompatCursor."""
def cursor(self):
return psycopg2.extensions.connection.cursor(self, cursor_factory = _CompatCursor)
def _pgconnect(cstr):
"""Create a psycopg2 connection."""
return _CompatConnection(cstr)
except ImportError:
# use psycopg 1
try:
from psycopg import connect as _pgconnect
from psycopg import QuotedString
except ImportError:
print "Please install psycopg2 module"
sys.exit(1)
def connect_database(connstr):
"""Create a db connection with connect_timeout option.
Default connect_timeout is 15, to change put it directly into dsn.
"""
# allow override
if connstr.find("connect_timeout") < 0:
connstr += " connect_timeout=15"
# create connection
return _pgconnect(connstr)
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