Mercurial > hg > Feedworm

annotate backend/sqlalchemy/Mapping.py @ 155:a05719a6175e

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move common functionality into an abstract backend class, have both backends inherit from it. Implement enough of the couchdb backend that reading feeds (and marking feed entries as read) is possible
author Dirk Olmes <dirk@xanthippe.ping.de>
date Sat, 27 Aug 2011 08:52:03 +0200
parents 04a730f9d07d
children bb3c851b18b1
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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 # update interval is specified in minutes
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37 Column("update_interval", Integer, nullable=False),
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38 Column("next_update", DateTime, nullable=False),
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39 # when displaying an entry of this feed, do not display the summary but rather load
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40 # the link directly
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41 Column("auto_load_entry_link", Boolean, nullable=False),
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42 # this is actually a hack: when opening some sites in the QWebView it just crashes.
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43 # This setting forces to open an entry's link in the external browser
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44 Column("always_open_in_browser", Boolean, nullable=False)
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45 )
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47 global feedEntryTable
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48 feedEntryTable = Table("feed_entry", metadata,
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49 Column("pk", Integer, primary_key=True),
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50 Column("create_timestamp", DateTime, nullable=False),
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51 Column("read", Integer, nullable=False),
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52
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53 Column("id", String(512), nullable=False),
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54 Column("link", String(512), nullable=False),
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55 Column("title", Text, nullable=False),
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56 Column("summary", Text, nullable=False),
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57 Column("updated", DateTime),
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58 Column("feed_id", Integer, ForeignKey("feed.pk"))
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59 )
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61 preferencesTable = Table("preference", metadata,
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62 Column("pk", Integer, primary_key=True),
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63 Column("key", String(255), nullable=False),
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64 Column("value", String(255), nullable=False)
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65 )
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67 metadata.create_all()
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69 mapper(FeedEntry, feedEntryTable)
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70 mapper(Feed, feedTable,
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71 properties = {
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72 "entries" : relation(FeedEntry, backref="feed", lazy=True, cascade="delete, delete-orphan")
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73 }
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74 )
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75 mapper(Preference, preferencesTable)