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annotate 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
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8a624ee48a74 First skeleton for sqlalchemy: define the mapping and create the first feed
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2 from Feed import Feed
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3 from FeedEntry import FeedEntry
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4 from sqlalchemy import Column
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5 from sqlalchemy import DateTime
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6 from sqlalchemy import ForeignKey
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7 from sqlalchemy import Integer
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8 from sqlalchemy import MetaData
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9 from sqlalchemy import String
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10 from sqlalchemy import Table
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11 from sqlalchemy import Text
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12 from sqlalchemy.orm import mapper
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13 from sqlalchemy.orm import relation
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15 mappingDefined = False
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17 def createMapping(engine):
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18 """ Make sure the mapping is defined only once. This is not really needed for the feed updater
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19 or the GUI app but comes in handy when working interactively with the system. """
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20 global mappingDefined
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21 if not mappingDefined:
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22 _createMapping(engine)
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23 mappingDefined = True
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25 def _createMapping(engine):
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26 metadata = MetaData(engine)
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28 feedTable = Table("feed", metadata,
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29 Column("pk", Integer, primary_key=True),
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215c34f61e95 Feed.url -> Feed.rss_url
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30 Column("title", String(255), nullable=False),
215c34f61e95 Feed.url -> Feed.rss_url
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31 Column("rss_url", String(255), nullable=False)
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32 )
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34 feedEntryTable = Table("feed_entry", metadata,
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35 Column("pk", Integer, primary_key=True),
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36 Column("create_timestamp", DateTime, nullable=False),
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37 Column("read", Integer, nullable=False),
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39 Column("id", String(255), nullable=False),
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40 Column("link", String(255), nullable=False),
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41 Column("title", Text, nullable=False),
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42 Column("summary", Text, nullable=False),
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43 Column("updated", DateTime),
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44 Column("feed_id", Integer, ForeignKey("feed.pk"))
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45 )
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47 metadata.create_all()
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48
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49 mapper(FeedEntry, feedEntryTable)
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50 mapper(Feed, feedTable,
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51 properties = {
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52 "entries" : relation(FeedEntry, backref = "feed")
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53 }
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54 )