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48 lines
2.2 KiB
Python

import os
import warnings
from dataset.database import Database
from dataset.table import Table
from dataset.util import row_type
# shut up useless SA warning:
warnings.filterwarnings(
'ignore', 'Unicode type received non-unicode bind param value.')
warnings.filterwarnings(
'ignore', 'Skipping unsupported ALTER for creation of implicit constraint')
__all__ = ['Database', 'Table', 'freeze', 'connect']
__version__ = '1.3.1'
def connect(url=None, schema=None, reflect_metadata=True, engine_kwargs=None,
reflect_views=True, ensure_schema=True, row_type=row_type):
""" Opens a new connection to a database.
*url* can be any valid `SQLAlchemy engine URL`_. If *url* is not defined
it will try to use *DATABASE_URL* from environment variable. Returns an
instance of :py:class:`Database <dataset.Database>`. Set *reflect_metadata*
to False if you don't want the entire database schema to be pre-loaded.
This significantly speeds up connecting to large databases with lots of
tables. *reflect_views* can be set to False if you don't want views to be
loaded. Additionally, *engine_kwargs* will be directly passed to
SQLAlchemy, e.g. set *engine_kwargs={'pool_recycle': 3600}* will avoid `DB
connection timeout`_. Set *row_type* to an alternate dict-like class to
change the type of container rows are stored in.::
db = dataset.connect('sqlite:///factbook.db')
One of the main features of `dataset` is to automatically create tables and
columns as data is inserted. This behaviour can optionally be disabled via
the `ensure_schema` argument. It can also be overridden in a lot of the
data manipulation methods using the `ensure` flag.
.. _SQLAlchemy Engine URL: http://docs.sqlalchemy.org/en/latest/core/engines.html#sqlalchemy.create_engine
.. _DB connection timeout: http://docs.sqlalchemy.org/en/latest/core/pooling.html#setting-pool-recycle
"""
if url is None:
url = os.environ.get('DATABASE_URL', 'sqlite://')
return Database(url, schema=schema, reflect_metadata=reflect_metadata,
engine_kwargs=engine_kwargs, reflect_views=reflect_views,
ensure_schema=ensure_schema, row_type=row_type)