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127 lines
4.7 KiB
Python
127 lines
4.7 KiB
Python
"""A Python driver for PostgreSQL
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psycopg is a PostgreSQL_ database adapter for the Python_ programming
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language. This is version 2, a complete rewrite of the original code to
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provide new-style classes for connection and cursor objects and other sweet
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candies. Like the original, psycopg 2 was written with the aim of being very
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small and fast, and stable as a rock.
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Homepage: https://psycopg.org/
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.. _PostgreSQL: https://www.postgresql.org/
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.. _Python: https://www.python.org/
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:Groups:
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* `Connections creation`: connect
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* `Value objects constructors`: Binary, Date, DateFromTicks, Time,
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TimeFromTicks, Timestamp, TimestampFromTicks
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"""
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# psycopg/__init__.py - initialization of the psycopg module
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#
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# Copyright (C) 2003-2019 Federico Di Gregorio <fog@debian.org>
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# Copyright (C) 2020-2021 The Psycopg Team
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#
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# psycopg2 is free software: you can redistribute it and/or modify it
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# under the terms of the GNU Lesser General Public License as published
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# by the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# In addition, as a special exception, the copyright holders give
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# permission to link this program with the OpenSSL library (or with
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# modified versions of OpenSSL that use the same license as OpenSSL),
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# and distribute linked combinations including the two.
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#
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# You must obey the GNU Lesser General Public License in all respects for
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# all of the code used other than OpenSSL.
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#
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# psycopg2 is distributed in the hope that it will be useful, but WITHOUT
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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# FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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# License for more details.
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# Import modules needed by _psycopg to allow tools like py2exe to do
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# their work without bothering about the module dependencies.
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# Note: the first internal import should be _psycopg, otherwise the real cause
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# of a failed loading of the C module may get hidden, see
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# https://archives.postgresql.org/psycopg/2011-02/msg00044.php
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# Import the DBAPI-2.0 stuff into top-level module.
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from psycopg2._psycopg import ( # noqa
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BINARY, NUMBER, STRING, DATETIME, ROWID,
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Binary, Date, Time, Timestamp,
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DateFromTicks, TimeFromTicks, TimestampFromTicks,
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Error, Warning, DataError, DatabaseError, ProgrammingError, IntegrityError,
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InterfaceError, InternalError, NotSupportedError, OperationalError,
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_connect, apilevel, threadsafety, paramstyle,
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__version__, __libpq_version__,
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)
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# Register default adapters.
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from psycopg2 import extensions as _ext
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_ext.register_adapter(tuple, _ext.SQL_IN)
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_ext.register_adapter(type(None), _ext.NoneAdapter)
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# Register the Decimal adapter here instead of in the C layer.
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# This way a new class is registered for each sub-interpreter.
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# See ticket #52
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from decimal import Decimal # noqa
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from psycopg2._psycopg import Decimal as Adapter # noqa
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_ext.register_adapter(Decimal, Adapter)
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del Decimal, Adapter
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def connect(dsn=None, connection_factory=None, cursor_factory=None, **kwargs):
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"""
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Create a new database connection.
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The connection parameters can be specified as a string:
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conn = psycopg2.connect("dbname=test user=postgres password=secret")
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or using a set of keyword arguments:
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conn = psycopg2.connect(database="test", user="postgres", password="secret")
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Or as a mix of both. The basic connection parameters are:
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- *dbname*: the database name
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- *database*: the database name (only as keyword argument)
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- *user*: user name used to authenticate
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- *password*: password used to authenticate
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- *host*: database host address (defaults to UNIX socket if not provided)
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- *port*: connection port number (defaults to 5432 if not provided)
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Using the *connection_factory* parameter a different class or connections
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factory can be specified. It should be a callable object taking a dsn
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argument.
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Using the *cursor_factory* parameter, a new default cursor factory will be
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used by cursor().
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Using *async*=True an asynchronous connection will be created. *async_* is
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a valid alias (for Python versions where ``async`` is a keyword).
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Any other keyword parameter will be passed to the underlying client
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library: the list of supported parameters depends on the library version.
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"""
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kwasync = {}
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if 'async' in kwargs:
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kwasync['async'] = kwargs.pop('async')
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if 'async_' in kwargs:
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kwasync['async_'] = kwargs.pop('async_')
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dsn = _ext.make_dsn(dsn, **kwargs)
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conn = _connect(dsn, connection_factory=connection_factory, **kwasync)
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if cursor_factory is not None:
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conn.cursor_factory = cursor_factory
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return conn
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