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47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
from sqlalchemy import MetaData, Table, engine_from_config, orm
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from ..defaults import get_default_db_uri
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from .tables import metadata
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def connect(uri=None, session_args={}, engine_args={}, engine_prefix=''):
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"""Connects to the requested URI. Returns a session object.
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With the URI omitted, attempts to connect to a default SQLite database
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contained within the package directory.
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Calling this function also binds the metadata object to the created engine.
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"""
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# If we didn't get a uri, fall back to the default
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if uri is None:
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uri = engine_args[engine_prefix + 'url']
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if uri is None:
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uri = get_default_db_uri()
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### Do some fixery for MySQL
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if uri[0:5] == 'mysql':
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# MySQL uses latin1 for connections by default even if the server is
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# otherwise oozing with utf8; charset fixes this
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if 'charset' not in uri:
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uri += '?charset=utf8'
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# Tables should be InnoDB, in the event that we're creating them, and
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# use UTF-8 goddammit!
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for table in metadata.tables.values():
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table.kwargs['mysql_engine'] = 'InnoDB'
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table.kwargs['mysql_charset'] = 'utf8'
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### Connect
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engine_args[engine_prefix + 'url'] = uri
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engine = engine_from_config(engine_args, prefix=engine_prefix)
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conn = engine.connect()
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metadata.bind = engine
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all_session_args = dict(autoflush=True, autocommit=False, bind=engine)
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all_session_args.update(session_args)
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sm = orm.sessionmaker(**all_session_args)
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session = orm.scoped_session(sm)
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return session
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