Mercurial > hg > Feedworm

annotate backend/sqlalchemy/Database.py @ 155:a05719a6175e

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move common functionality into an abstract backend class, have both backends inherit from it. Implement enough of the couchdb backend that reading feeds (and marking feed entries as read) is possible
author Dirk Olmes <dirk@xanthippe.ping.de>
date Sat, 27 Aug 2011 08:52:03 +0200
parents 5b131f82057d
children bb3c851b18b1
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2 from sqlalchemy.engine import create_engine
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3 from sqlalchemy.orm import sessionmaker
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4 import Mapping
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5 import argparse
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6 import util
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8 # Keep the connection to the database only once. The feed updater and the GUI app will
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9 # operate on a single engine/session but this comes in handy for interactive use
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10 engine = None
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11 SessionMaker = None
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13 def createSession(databaseUrl=None):
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14 if databaseUrl is None:
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15 databaseUrl = _getDatabaseUrl()
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16 initEngine(databaseUrl)
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17 Mapping.createMapping(engine)
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18 initSessionMaker()
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19 return SessionMaker()
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21 def _getDatabaseUrl():
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22 parser = argparse.ArgumentParser()
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23 parser.add_argument("--dburl", nargs="?", required=True, help="Database URL for the sqlalchemy backend")
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24 args = parser.parse_known_args()
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25 return args[0].dburl
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27 def initEngine(databaseUrl):
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28 global engine
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29 if engine is None:
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30 verbose = util.databaseLoggingEnabled()
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31 engine = create_engine(databaseUrl, echo=verbose)
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33 def initSessionMaker():
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34 global SessionMaker
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35 if SessionMaker is None:
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36 SessionMaker = sessionmaker(bind=engine)