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39 lines
986 B
Python
39 lines
986 B
Python
"""
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Common db functions
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"""
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import logging
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from sqlalchemy import MetaData, create_engine
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from sqlalchemy.orm import sessionmaker
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from sqlalchemy.ext.declarative import declarative_base
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# Prepare SQLAlchemy objects
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Meta = MetaData()
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Base = declarative_base(metadata=Meta)
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Session = sessionmaker()
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DbFilename = None
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def connect(filename=None):
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"""
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create engine and bind to Meta object.
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Arguments:
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@filename - string with absolute or relative path to sqlite database
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file. If None, db in-memory will be created
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"""
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global DbFilename
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if not filename:
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logging.warning('Using in-memory database. Will disappear after '
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'program ends. This is probably not what you expect.')
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filename = ':memory:'
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DbFilename = filename
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connect_string = "sqlite:///%s" % filename
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engine = create_engine(connect_string)
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Meta.bind = engine
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Meta.create_all(checkfirst=True)
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return engine
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