Anna Schumaker
5746b2a81f
For mapping tracks into a list of genres, or a genre into a list of tracks. Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>
92 lines
2.8 KiB
Python
92 lines
2.8 KiB
Python
# Copyright 2021 (c) Anna Schumaker.
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#
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# Table: genres
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# +---------+------+------+
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# | genreid | name | sort |
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# +---------+------+------+
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#
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# Index: genre_index
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# +-----------------+
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# | name -> genreid |
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# +-----------------+
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#
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# Map: genre_map
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# +---------+---------+
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# | genreid | trackid |
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# +---------+---------+
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from . import execute
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from . import objects
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from . import track
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class Genre(objects.Tag):
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def do_get_column(self, column):
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return execute(f"SELECT {column} FROM genres "
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"WHERE genreid=?", [ self.rowid ])
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class GenreTable(objects.Table):
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def __init__(self):
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objects.Table.__init__(self, "genres", Genre)
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def do_create(self):
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execute("CREATE TABLE IF NOT EXISTS genres "
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"(genreid INTEGER PRIMARY KEY, "
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" name TEXT UNIQUE, "
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" sort TEXT)")
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execute("CREATE INDEX IF NOT EXISTS genre_index "
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"ON genres(name)")
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def do_insert(self, name):
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return execute("INSERT INTO genres (name, sort) "
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"VALUES (?, ?)", (name, name.casefold()))
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def do_delete(self, genre):
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return execute("DELETE FROM genres WHERE genreid=?", [ int(genre) ])
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def do_get(self, rowid):
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return execute("SELECT genreid FROM genres "
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"WHERE genreid=?", [ rowid ])
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def do_lookup(self, name):
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return execute("SELECT genreid FROM genres "
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"WHERE name=?", [ name ])
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class GenreMap(objects.Map):
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def __init__(self):
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objects.Map.__init__(self, "genre_map", Genre, track.Track)
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self.lookup_tracks = self.lookup_rhs
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self.lookup_genres = self.lookup_lhs
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def do_create(self):
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execute("CREATE TABLE IF NOT EXISTS genre_map "
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"(genreid INTEGER, "
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" trackid INTEGER, "
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" FOREIGN KEY(genreid) REFERENCES genres(genreid), "
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" FOREIGN KEY(trackid) REFERENCES tracks(trackid), "
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" UNIQUE(genreid, trackid))")
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def do_insert(self, genre, track):
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execute("INSERT INTO genre_map (genreid, trackid) "
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"VALUES (?, ?)", [ int(genre), int(track) ])
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def do_delete(self, genre, track):
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return execute("DELETE FROM genre_map WHERE genreid=? AND trackid=?",
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[ int(genre), int(track) ])
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def do_lookup_rhs(self, genre):
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return execute("SELECT trackid FROM genre_map "
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"WHERE genreid=?", [ int(genre) ])
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def do_lookup_lhs(self, track):
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return execute("SELECT genreid FROM genre_map "
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"WHERE trackid=?", [ int(track) ])
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def delete_track(self, track):
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for genre in self.lookup_genres(track):
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self.delete(genre, track)
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Table = GenreTable()
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Map = GenreMap()
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