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annotate backend/sqlalchemy/Database.py @ 119:04a730f9d07d backend

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move all sqlalchemy related classes to the respective sub-package. use a backend to abstract from access to the data
author Dirk Olmes <dirk@xanthippe.ping.de>
date Sun, 21 Aug 2011 03:55:16 +0200
parents Database.py@842727971796
children 5b131f82057d
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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 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(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 if len(sys.argv) < 2:
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23 print("Usage: %s <database url>" % (sys.argv[0]))
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24 sys.exit(1)
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25 return sys.argv[1]
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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)