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"""psycopg extensions to the DBAPI-2.0
This module holds all the extensions to the DBAPI-2.0 provided by psycopg.
- `connection` -- the new-type inheritable connection class
- `cursor` -- the new-type inheritable cursor class
- `lobject` -- the new-type inheritable large object class
- `adapt()` -- exposes the PEP-246_ compatible adapting mechanism used
by psycopg to adapt Python types to PostgreSQL ones
.. _PEP-246: http://www.python.org/peps/pep-0246.html
"""
# psycopg/extensions.py - DBAPI-2.0 extensions specific to psycopg
#
# Copyright (C) 2003-2010 Federico Di Gregorio <fog@debian.org>
#
# psycopg2 is free software: you can redistribute it and/or modify it
# under the terms of the GNU Lesser General Public License as published
# by the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# In addition, as a special exception, the copyright holders give
# permission to link this program with the OpenSSL library (or with
# modified versions of OpenSSL that use the same license as OpenSSL),
# and distribute linked combinations including the two.
#
# You must obey the GNU Lesser General Public License in all respects for
# all of the code used other than OpenSSL.
#
# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
# License for more details.
from psycopg2._psycopg import UNICODE, INTEGER, LONGINTEGER, BOOLEAN, FLOAT
from psycopg2._psycopg import TIME, DATE, INTERVAL, DECIMAL
from psycopg2._psycopg import BINARYARRAY, BOOLEANARRAY, DATEARRAY, DATETIMEARRAY
from psycopg2._psycopg import DECIMALARRAY, FLOATARRAY, INTEGERARRAY, INTERVALARRAY
from psycopg2._psycopg import LONGINTEGERARRAY, ROWIDARRAY, STRINGARRAY, TIMEARRAY
from psycopg2._psycopg import UNICODEARRAY
from psycopg2._psycopg import Binary, Boolean, Int, Float, QuotedString, AsIs
try:
from psycopg2._psycopg import MXDATE, MXDATETIME, MXINTERVAL, MXTIME
from psycopg2._psycopg import MXDATEARRAY, MXDATETIMEARRAY, MXINTERVALARRAY, MXTIMEARRAY
from psycopg2._psycopg import DateFromMx, TimeFromMx, TimestampFromMx
from psycopg2._psycopg import IntervalFromMx
except ImportError:
pass
try:
from psycopg2._psycopg import PYDATE, PYDATETIME, PYINTERVAL, PYTIME
from psycopg2._psycopg import PYDATEARRAY, PYDATETIMEARRAY, PYINTERVALARRAY, PYTIMEARRAY
from psycopg2._psycopg import DateFromPy, TimeFromPy, TimestampFromPy
from psycopg2._psycopg import IntervalFromPy
except ImportError:
pass
from psycopg2._psycopg import adapt, adapters, encodings, connection, cursor, lobject, Xid
from psycopg2._psycopg import string_types, binary_types, new_type, new_array_type, register_type
from psycopg2._psycopg import ISQLQuote, Notify, Diagnostics
from psycopg2._psycopg import QueryCanceledError, TransactionRollbackError
try:
from psycopg2._psycopg import set_wait_callback, get_wait_callback
except ImportError:
pass
"""Isolation level values."""
ISOLATION_LEVEL_AUTOCOMMIT = 0
ISOLATION_LEVEL_READ_UNCOMMITTED = 4
ISOLATION_LEVEL_READ_COMMITTED = 1
ISOLATION_LEVEL_REPEATABLE_READ = 2
ISOLATION_LEVEL_SERIALIZABLE = 3
"""psycopg connection status values."""
STATUS_SETUP = 0
STATUS_READY = 1
STATUS_BEGIN = 2
STATUS_SYNC = 3 # currently unused
STATUS_ASYNC = 4 # currently unused
STATUS_PREPARED = 5
# This is a useful mnemonic to check if the connection is in a transaction
STATUS_IN_TRANSACTION = STATUS_BEGIN
"""psycopg asynchronous connection polling values"""
POLL_OK = 0
POLL_READ = 1
POLL_WRITE = 2
POLL_ERROR = 3
"""Backend transaction status values."""
TRANSACTION_STATUS_IDLE = 0
TRANSACTION_STATUS_ACTIVE = 1
TRANSACTION_STATUS_INTRANS = 2
TRANSACTION_STATUS_INERROR = 3
TRANSACTION_STATUS_UNKNOWN = 4
import sys as _sys
# Return bytes from a string
if _sys.version_info[0] < 3:
def b(s):
return s
else:
def b(s):
return s.encode('utf8')
def register_adapter(typ, callable):
"""Register 'callable' as an ISQLQuote adapter for type 'typ'."""
adapters[(typ, ISQLQuote)] = callable
# The SQL_IN class is the official adapter for tuples starting from 2.0.6.
class SQL_IN(object):
"""Adapt any iterable to an SQL quotable object."""
def __init__(self, seq):
self._seq = seq
self._conn = None
def prepare(self, conn):
self._conn = conn
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
pobjs = [adapt(o) for o in self._seq]
if self._conn is not None:
for obj in pobjs:
if hasattr(obj, 'prepare'):
obj.prepare(self._conn)
qobjs = [o.getquoted() for o in pobjs]
return b('(') + b(', ').join(qobjs) + b(')')
def __str__(self):
return str(self.getquoted())
class NoneAdapter(object):
"""Adapt None to NULL.
This adapter is not used normally as a fast path in mogrify uses NULL,
but it makes easier to adapt composite types.
"""
def __init__(self, obj):
pass
def getquoted(self, _null=b("NULL")):
return _null
# Create default json typecasters for PostgreSQL 9.2 oids
from psycopg2._json import register_default_json, register_default_jsonb
try:
JSON, JSONARRAY = register_default_json()
JSONB, JSONBARRAY = register_default_jsonb()
except ImportError:
pass
del register_default_json, register_default_jsonb
# Create default Range typecasters
from psycopg2. _range import Range
del Range
# Add the "cleaned" version of the encodings to the key.
# When the encoding is set its name is cleaned up from - and _ and turned
# uppercase, so an encoding not respecting these rules wouldn't be found in the
# encodings keys and would raise an exception with the unicode typecaster
for k, v in encodings.items():
k = k.replace('_', '').replace('-', '').upper()
encodings[k] = v
del k, v