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annotate Database.py @ 34:5813e3c10f14

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move the database logic out into its own module. Make everything reload safe so that multiple sessions can be created from interactive sessions
author Dirk Olmes <dirk@xanthippe.ping.de>
date Wed, 05 May 2010 02:14:05 +0200
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children 22214d79ed41
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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
Dirk Olmes <dirk@xanthippe.ping.de>
parents:
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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
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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4 import sqlalchemy.orm
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5 import util
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7 # Keep the connection to the database only once. The feed updater and the GUI app will
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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8 # operate on a single engine/session but this comes in handy for interactive use
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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9 engine = None
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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10 SessionMaker = None
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12 def createSession():
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13 databaseUrl = util.loadDatabaseUrl()
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14 initEngine(databaseUrl)
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15 Mapping.createMapping(engine)
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16 initSessionMaker()
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17 return SessionMaker()
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19 def initEngine(databaseUrl):
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20 global engine
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21 if engine is None:
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22 engine = sqlalchemy.create_engine(databaseUrl, echo=False)
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24 def initSessionMaker():
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25 global SessionMaker
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26 if SessionMaker is None:
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27 SessionMaker = sqlalchemy.orm.sessionmaker(bind=engine)
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