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annotate Database.py @ 66:97c4e94f99cf

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author dirk@xanthippe.ping.de
date Thu, 29 Jul 2010 21:37:46 +0200
parents 254d5b89a6ca
children 842727971796
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5813e3c10f14 move the database logic out into its own module. Make everything reload safe so that multiple sessions can be created from interactive sessions
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2 import Mapping
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3 import sqlalchemy
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4 import sqlalchemy.orm
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5 import sys
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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():
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14 databaseUrl = _getDatabaseUrl()
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15 initEngine(databaseUrl)
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16 Mapping.createMapping(engine)
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17 initSessionMaker()
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18 return SessionMaker()
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20 def _getDatabaseUrl():
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21 if len(sys.argv) < 2:
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22 print("Usage: %s <database url>" % (sys.argv[0]))
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23 sys.exit(1)
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24 return sys.argv[1]
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26 def initEngine(databaseUrl):
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27 global engine
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28 if engine is None:
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29 verbose = util.databaseLoggingEnabled()
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30 engine = sqlalchemy.create_engine(databaseUrl, echo=verbose)
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32 def initSessionMaker():
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33 global SessionMaker
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34 if SessionMaker is None:
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35 SessionMaker = sqlalchemy.orm.sessionmaker(bind=engine)
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