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annotate Mapping.py @ 73:5585f3d23541

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Simplify: no classes needed for simple if
author Dirk Olmes <dirk@xanthippe.ping.de>
date Wed, 11 Aug 2010 03:26:21 +0200
parents 525a52169f60
children f909550683b0
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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 Preference import Preference
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5 from sqlalchemy import Boolean
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6 from sqlalchemy import Column
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7 from sqlalchemy import DateTime
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8 from sqlalchemy import ForeignKey
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9 from sqlalchemy import Integer
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10 from sqlalchemy import MetaData
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11 from sqlalchemy import String
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12 from sqlalchemy import Table
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13 from sqlalchemy import Text
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14 from sqlalchemy.orm import mapper
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15 from sqlalchemy.orm import relation
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17 mappingDefined = False
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18 feedEntryTable = None
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20 def createMapping(engine):
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21 """ Make sure the mapping is defined only once. This is not really needed for the feed updater
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22 or the GUI app but comes in handy when working interactively with the system. """
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23 global mappingDefined
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24 if not mappingDefined:
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25 _createMapping(engine)
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26 mappingDefined = True
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28 def _createMapping(engine):
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29 metadata = MetaData(engine)
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30 metadata.bind = engine
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32 feedTable = Table("feed", metadata,
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33 Column("pk", Integer, primary_key=True),
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34 Column("title", String(255), nullable=False),
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35 Column("rss_url", String(255), nullable=False),
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36 Column("update_interval", Integer, nullable=False),
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37 Column("next_update", DateTime, nullable=False),
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38 # when displaying an entry of this feed, do not display the summary but rather load
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39 # the link directly
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40 Column("auto_load_entry_link", Boolean, nullable=False)
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41 )
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43 global feedEntryTable
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44 feedEntryTable = Table("feed_entry", metadata,
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45 Column("pk", Integer, primary_key=True),
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46 Column("create_timestamp", DateTime, nullable=False),
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47 Column("read", Integer, nullable=False),
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48
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49 Column("id", String(255), nullable=False),
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50 Column("link", String(255), nullable=False),
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51 Column("title", Text, nullable=False),
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52 Column("summary", Text, nullable=False),
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53 Column("updated", DateTime),
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54 Column("feed_id", Integer, ForeignKey("feed.pk"))
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55 )
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57 preferencesTable = Table("preference", metadata,
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58 Column("pk", Integer, primary_key=True),
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59 Column("key", String(255), nullable=False),
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60 Column("value", String(255), nullable=False)
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61 )
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63 metadata.create_all()
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65 mapper(FeedEntry, feedEntryTable)
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66 mapper(Feed, feedTable,
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67 properties = {
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68 "entries" : relation(FeedEntry, backref="feed", lazy=True)
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69 }
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70 )
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71 mapper(Preference, preferencesTable)