Mercurial > hg > Feedworm

diff Mapping.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
parents ee1432a91141
children aaec263f07ca
line wrap: on
line diff
--- a/Mapping.py	Fri Apr 30 06:22:33 2010 +0200
+++ b/Mapping.py	Wed May 05 02:14:05 2010 +0200
@@ -12,7 +12,17 @@
 from sqlalchemy.orm import mapper
 from sqlalchemy.orm import relation
 
+mappingDefined = False
+
 def createMapping(engine):
+    """ Make sure the mapping is defined only once. This is not really needed for the feed updater
+        or the GUI app but comes in handy when working interactively with the system. """
+    global mappingDefined
+    if not mappingDefined:
+        _createMapping(engine)
+        mappingDefined = True
+
+def _createMapping(engine):
     metadata = MetaData(engine)
     
     feedTable = Table("feed", metadata,