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annotate Mapping.py @ 35:aaec263f07ca

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Feeds manage the point in time when the next update should happen. FeedUpdater only updates feeds that are due.
author Dirk Olmes <dirk@xanthippe.ping.de>
date Wed, 05 May 2010 03:07:59 +0200
parents 5813e3c10f14
children 12ed8b5fa08c
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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),
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31 Column("rss_url", String(255), nullable=False),
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32 Column("update_interval", Integer, nullable=False),
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33 Column("next_update", DateTime, nullable=False)
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34 )
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36 feedEntryTable = Table("feed_entry", metadata,
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37 Column("pk", Integer, primary_key=True),
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38 Column("create_timestamp", DateTime, nullable=False),
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74481aa49974 add a read flag for feed entries so they can be marked read
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39 Column("read", Integer, nullable=False),
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41 Column("id", String(255), nullable=False),
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42 Column("link", String(255), nullable=False),
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43 Column("title", Text, nullable=False),
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44 Column("summary", Text, nullable=False),
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45 Column("updated", DateTime),
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46 Column("feed_id", Integer, ForeignKey("feed.pk"))
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47 )
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49 metadata.create_all()
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51 mapper(FeedEntry, feedEntryTable)
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52 mapper(Feed, feedTable,
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53 properties = {
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54 "entries" : relation(FeedEntry, backref="feed")
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55 }
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56 )