mirror of
https://github.com/psycopg/psycopg2.git
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102 lines
3.3 KiB
Python
102 lines
3.3 KiB
Python
"""psycopg extensions to the DBAPI-2.0
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This module holds all the extensions to the DBAPI-2.0 provided by psycopg.
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- `connection` -- the new-type inheritable connection class
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- `cursor` -- the new-type inheritable cursor class
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- `adapt()` -- exposes the PEP-246_ compatible adapting mechanism used
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by psycopg to adapt Python types to PostgreSQL ones
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.. _PEP-246: http://www.python.org/peps/pep-0246.html
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"""
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# psycopg/extensions.py - DBAPI-2.0 extensions specific to 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 import UNICODE, INTEGER, LONGINTEGER, BOOLEAN, FLOAT
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from _psycopg import TIME, DATE, INTERVAL
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from _psycopg import Boolean, QuotedString, AsIs
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try:
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from _psycopg import DateFromMx, TimeFromMx, TimestampFromMx
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from _psycopg import IntervalFromMx
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except:
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pass
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try:
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from _psycopg import DateFromPy, TimeFromPy, TimestampFromPy
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from _psycopg import IntervalFromPy
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except:
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pass
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from _psycopg import adapt, adapters, encodings, connection, cursor
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from _psycopg import string_types, binary_types, new_type, register_type
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from _psycopg import ISQLQuote
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"""Isolation level values."""
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ISOLATION_LEVEL_AUTOCOMMIT = 0
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ISOLATION_LEVEL_READ_COMMITTED = 1
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ISOLATION_LEVEL_SERIALIZABLE = 2
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# PostgreSQL maps the the other standard values to already defined levels
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ISOLATION_LEVEL_REPEATABLE_READ = ISOLATION_LEVEL_SERIALIZABLE
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ISOLATION_LEVEL_READ_UNCOMMITTED = ISOLATION_LEVEL_READ_COMMITTED
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"""psycopg connection status values."""
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STATUS_SETUP = 0
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STATUS_READY = 1
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STATUS_BEGIN = 2
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STATUS_SYNC = 3
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STATUS_ASYNC = 4
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# This is a usefull mnemonic to check if the connection is in a transaction
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STATUS_IN_TRANSACTION = STATUS_BEGIN
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"""Backend transaction status values."""
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TRANSACTION_STATUS_IDLE = 0
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TRANSACTION_STATUS_ACTIVE = 1
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TRANSACTION_STATUS_INTRANS = 2
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TRANSACTION_STATUS_INERROR = 3
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TRANSACTION_STATUS_UNKNOWN = 4
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def register_adapter(typ, callable):
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"""Register 'callable' as an ISQLQuote adapter for type 'typ'."""
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adapters[(typ, ISQLQuote)] = callable
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# The SQL_IN class is the official adapter for tuples starting from 2.0.6.
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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 prepare(self, conn):
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self._conn = conn
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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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pobjs = [adapt(o) for o in self._seq]
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for obj in pobjs:
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if hasattr(obj, 'prepare'):
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obj.prepare(self._conn)
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qobjs = [str(o.getquoted()) for o in pobjs]
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return '(' + ', '.join(qobjs) + ')'
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__str__ = getquoted
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register_adapter(tuple, SQL_IN)
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__all__ = [ k for k in locals().keys() if not k.startswith('_') ]
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