sima/lib/simadb.py

   1 # -*- coding: utf-8 -*-
   2 #
   3 # Copyright (c) 2009-2013 Jack Kaliko <jack@azylum.org>
   4 # Copyright (c) 2009, Eric Casteleijn <thisfred@gmail.com>
   5 # Copyright (c) 2008 Rick van Hattem
   6 #
   7 #  This file is part of sima
   8 #
   9 #  sima is free software: you can redistribute it and/or modify
  10 #  it under the terms of the GNU General Public License as published by
  11 #  the Free Software Foundation, either version 3 of the License, or
  12 #  (at your option) any later version.
  13 #
  14 #  sima is distributed in the hope that it will be useful,
  15 #  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 #  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 #  GNU General Public License for more details.
  18 #
  19 #  You should have received a copy of the GNU General Public License
  20 #  along with sima.  If not, see <http://www.gnu.org/licenses/>.
  21 #
  22 #
  23 """SQlite database library
  24 """
  25
  26 #    DOC:
  27 #    MuscicBrainz ID: <http://musicbrainz.org/doc/MusicBrainzIdentifier>
  28 #    Artists: <http://musicbrainz.org/doc/Artist_Name>
  29 #             <http://musicbrainz.org/doc/Same_Artist_With_Different_Names>
  30
  31 __DB_VERSION__ = 2
  32 __HIST_DURATION__ = int(30 * 24)  # in hours
  33
  34 import sqlite3
  35
  36 from datetime import (datetime, timedelta)
  37 from os.path import dirname, isdir
  38 from os import (access, W_OK, F_OK)
  39 from shutil import copyfile
  40
  41
  42 class SimaDBError(Exception):
  43     """
  44     Exceptions.
  45     """
  46     pass
  47
  48
  49 class SimaDBAccessError(SimaDBError):
  50     """Error on accessing DB file"""
  51     pass
  52
  53
  54 class SimaDBNoFile(SimaDBError):
  55     """No DB file present"""
  56     pass
  57
  58
  59 class SimaDBUpgradeError(SimaDBError):
  60     """Error on upgrade"""
  61     pass
  62
  63
  64 class SimaDB(object):
  65     "SQLite management"
  66
  67     def __init__(self, db_path=None):
  68         self._db_path = db_path
  69         self.db_path_mod_control()
  70
  71     def db_path_mod_control(self):
  72         """Controls DB path access & write permissions"""
  73         db_path = self._db_path
  74         # Controls directory access
  75         if not isdir(dirname(db_path)):
  76             raise SimaDBAccessError('Not a regular directory: "%s"' %
  77                     dirname(db_path))
  78         if not access(dirname(db_path), W_OK):
  79             raise SimaDBAccessError('No write access to "%s"' % dirname(db_path))
  80         # Is a file but no write access
  81         if access(db_path, F_OK) and not access(db_path, W_OK | F_OK):
  82             raise SimaDBAccessError('No write access to "%s"' % db_path)
  83         # No file
  84         if not access(db_path, F_OK):
  85             raise SimaDBNoFile('No DB file in "%s"' % db_path)
  86
  87     def close_database_connection(self, connection):
  88         """Close the database connection."""
  89         connection.close()
  90
  91     def get_database_connection(self):
  92         """get database reference"""
  93         connection = sqlite3.connect(
  94             self._db_path, timeout=5.0, isolation_level="immediate")
  95         #connection.text_factory = str
  96         return connection
  97
  98     def upgrade(self):
  99         """upgrade DB from previous versions"""
 100         connection = self.get_database_connection()
 101         try:
 102             connection.execute('SELECT version FROM db_info')
 103         except Exception as err:
 104             if err.__str__() == "no such table: db_info":
 105                 # db version < 2 (MPD_sima 0.6)
 106                 copyfile(self._db_path, self._db_path + '.0.6')
 107                 connection.execute('DROP TABLE tracks')
 108                 connection.commit()
 109                 self.create_db()
 110             else:
 111                 raise SimaDBUpgradeError('Could not upgrade database: "%s"' %
 112                         err)
 113         self.close_database_connection(connection)
 114
 115     def get_artist(self, artist_name, mbid=None,
 116             with_connection=None, add_not=False):
 117         """get artist information from the database.
 118         if not in database insert new entry."""
 119         if with_connection:
 120             connection = with_connection
 121         else:
 122             connection = self.get_database_connection()
 123         rows = connection.execute(
 124             "SELECT * FROM artists WHERE name = ?", (artist_name,))
 125         for row in rows:
 126             if not with_connection:
 127                 self.close_database_connection(connection)
 128             return row
 129         if add_not:
 130             if not with_connection:
 131                 self.close_database_connection(connection)
 132             return False
 133         connection.execute(
 134             "INSERT INTO artists (name, mbid) VALUES (?, ?)",
 135             (artist_name, mbid))
 136         connection.commit()
 137         rows = connection.execute(
 138             "SELECT * FROM artists WHERE name = ?", (artist_name,))
 139         for row in rows:
 140             if not with_connection:
 141                 self.close_database_connection(connection)
 142             return row
 143         if not with_connection:
 144             self.close_database_connection(connection)
 145
 146     def get_track(self, track, with_connection=None, add_not=False):
 147         """
 148         Get a track from Tracks table, add if not existing,
 149         Attention: use Track() object!!
 150         if not in database insert new entry."""
 151         art = track.artist
 152         nam = track.title
 153         fil = track.file
 154         if with_connection:
 155             connection = with_connection
 156         else:
 157             connection = self.get_database_connection()
 158         art_id = self.get_artist(art, with_connection=connection)[0]
 159         alb_id = self.get_album(track, with_connection=connection)[0]
 160         rows = connection.execute(
 161             "SELECT * FROM tracks WHERE name = ? AND"
 162             " artist = ? AND file = ?", (nam, art_id, fil))
 163         for row in rows:
 164             if not with_connection:
 165                 self.close_database_connection(connection)
 166             return row
 167         if add_not:
 168             return False
 169         connection.execute(
 170             "INSERT INTO tracks (artist, album, name, file) VALUES (?, ?, ?, ?)",
 171             (art_id, alb_id, nam, fil))
 172         connection.commit()
 173         rows = connection.execute(
 174             "SELECT * FROM tracks WHERE name = ? AND"
 175             " artist = ? AND album = ? AND file = ?",
 176             (nam, art_id, alb_id, fil,))
 177         for row in rows:
 178             if not with_connection:
 179                 self.close_database_connection(connection)
 180             return row
 181         if not with_connection:
 182             connection.commit()
 183             self.close_database_connection(connection)
 184
 185     def get_album(self, track, mbid=None,
 186             with_connection=None, add_not=False):
 187         """
 188         get album information from the database.
 189         if not in database insert new entry.
 190         Attention: use Track() object!!
 191         Use AlbumArtist tag is provided, fallback to Album tag
 192         """
 193         if with_connection:
 194             connection = with_connection
 195         else:
 196             connection = self.get_database_connection()
 197         if track.albumartist:
 198             artist = track.albumartist
 199         else:
 200             artist = track.artist
 201         art_id = self.get_artist(artist, with_connection=connection)[0]
 202         album = track.album
 203         rows = connection.execute(
 204             "SELECT * FROM albums WHERE name = ? AND artist = ?",
 205             (album, art_id))
 206         for row in rows:
 207             if not with_connection:
 208                 self.close_database_connection(connection)
 209             return row
 210         if add_not:
 211             return False
 212         connection.execute(
 213             "INSERT INTO albums (name, artist, mbid) VALUES (?, ?, ?)",
 214             (album, art_id, mbid))
 215         connection.commit()
 216         rows = connection.execute(
 217             "SELECT * FROM albums WHERE name = ? AND artist = ?",
 218             (album, art_id))
 219         for row in rows:
 220             if not with_connection:
 221                 self.close_database_connection(connection)
 222             return row
 223         if not with_connection:
 224             self.close_database_connection(connection)
 225
 226     def get_artists(self, with_connection=None):
 227         """Returns all artists in DB"""
 228         if with_connection:
 229             connection = with_connection
 230         else:
 231             connection = self.get_database_connection()
 232         rows = connection.execute("SELECT name FROM artists ORDER BY name")
 233         results = [row for row in rows]
 234         if not with_connection:
 235             self.close_database_connection(connection)
 236         for artist in results:
 237             yield artist
 238
 239     def get_bl_artist(self, artist_name,
 240             with_connection=None, add_not=None):
 241         """get blacklisted artist information from the database."""
 242         if with_connection:
 243             connection = with_connection
 244         else:
 245             connection = self.get_database_connection()
 246         art = self.get_artist(artist_name,
 247                 with_connection=connection, add_not=add_not)
 248         if not art:
 249             return False
 250         art_id = art[0]
 251         rows = connection.execute("SELECT * FROM black_list WHERE artist = ?",
 252                 (art_id,))
 253         for row in rows:
 254             if not with_connection:
 255                 self.close_database_connection(connection)
 256             return row
 257         if add_not:
 258             if not with_connection:
 259                 self.close_database_connection(connection)
 260             return False
 261         connection.execute("INSERT INTO black_list (artist) VALUES (?)",
 262                 (art_id,))
 263         connection.execute("UPDATE black_list SET updated = DATETIME('now')"
 264                 " WHERE artist = ?", (art_id,))
 265         connection.commit()
 266         rows = connection.execute("SELECT * FROM black_list WHERE artist = ?",
 267                 (art_id,))
 268         for row in rows:
 269             if not with_connection:
 270                 self.close_database_connection(connection)
 271             return row
 272         if not with_connection:
 273             self.close_database_connection(connection)
 274         return False
 275
 276     def get_bl_album(self, track,
 277             with_connection=None, add_not=None):
 278         """get blacklisted album information from the database."""
 279         if with_connection:
 280             connection = with_connection
 281         else:
 282             connection = self.get_database_connection()
 283         album = self.get_album(track,
 284                 with_connection=connection, add_not=add_not)
 285         if not album:
 286             return False
 287         alb_id = album[0]
 288         rows = connection.execute("SELECT * FROM black_list WHERE album = ?",
 289                 (alb_id,))
 290         for row in rows:
 291             if not with_connection:
 292                 self.close_database_connection(connection)
 293             return row
 294         if add_not:
 295             if not with_connection:
 296                 self.close_database_connection(connection)
 297             return False
 298         connection.execute("INSERT INTO black_list (album) VALUES (?)",
 299                 (alb_id,))
 300         connection.execute("UPDATE black_list SET updated = DATETIME('now')"
 301                 " WHERE album = ?", (alb_id,))
 302         connection.commit()
 303         rows = connection.execute("SELECT * FROM black_list WHERE album = ?",
 304                 (alb_id,))
 305         for row in rows:
 306             if not with_connection:
 307                 self.close_database_connection(connection)
 308             return row
 309         if not with_connection:
 310             self.close_database_connection(connection)
 311         return False
 312
 313     def get_bl_track(self, track, with_connection=None, add_not=None):
 314         """get blacklisted track information from the database."""
 315         if with_connection:
 316             connection = with_connection
 317         else:
 318             connection = self.get_database_connection()
 319         track = self.get_track(track,
 320                 with_connection=connection, add_not=add_not)
 321         if not track:
 322             return False
 323         track_id = track[0]
 324         rows = connection.execute("SELECT * FROM black_list WHERE track = ?",
 325                 (track_id,))
 326         for row in rows:
 327             if not with_connection:
 328                 self.close_database_connection(connection)
 329             return row
 330         if add_not:
 331             if not with_connection:
 332                 self.close_database_connection(connection)
 333             return False
 334         connection.execute("INSERT INTO black_list (track) VALUES (?)",
 335                 (track_id,))
 336         connection.execute("UPDATE black_list SET updated = DATETIME('now')"
 337                 " WHERE track = ?", (track_id,))
 338         connection.commit()
 339         rows = connection.execute("SELECT * FROM black_list WHERE track = ?",
 340                 (track_id,))
 341         for row in rows:
 342             if not with_connection:
 343                 self.close_database_connection(connection)
 344             return row
 345         if not with_connection:
 346             self.close_database_connection(connection)
 347         return False
 348
 349     def get_history(self, artist=None, artists=None, duration=__HIST_DURATION__):
 350         """Retrieve complete play history, most recent tracks first
 351         artist  : filter history for specific artist
 352         artists : filter history for specific artists list
 353         """ # pylint: disable=C0301
 354         date = datetime.utcnow() - timedelta(hours=duration)
 355         connection = self.get_database_connection()
 356         if artist:
 357             rows = connection.execute(
 358                 "SELECT arts.name, albs.name, trs.name, trs.file, hist.last_play"
 359                 " FROM artists AS arts, tracks AS trs, history AS hist, albums AS albs"
 360                 " WHERE trs.id = hist.track AND trs.artist = arts.id AND trs.album = albs.id"
 361                 " AND hist.last_play > ? AND arts.name = ?"
 362                 " ORDER BY hist.last_play DESC", (date.isoformat(' '), artist,))
 363         else:
 364             rows = connection.execute(
 365                 "SELECT arts.name, albs.name, trs.name, trs.file"
 366                 " FROM artists AS arts, tracks AS trs, history AS hist, albums AS albs"
 367                 " WHERE trs.id = hist.track AND trs.artist = arts.id AND trs.album = albs.id"
 368                 " AND hist.last_play > ? ORDER BY hist.last_play DESC", (date.isoformat(' '),))
 369         for row in rows:
 370             if artists and row[0] not in artists:
 371                 continue
 372             yield row
 373         self.close_database_connection(connection)
 374
 375     def get_black_list(self):
 376         """Retrieve complete black list."""
 377         connection = self.get_database_connection()
 378         rows = connection.execute('SELECT black_list.rowid, artists.name'
 379                 ' FROM artists INNER JOIN black_list'
 380                 ' ON artists.id = black_list.artist')
 381         yield ('Row ID', 'Actual black listed element', 'Extra information',)
 382         yield ('',)
 383         yield ('Row ID', 'Artist',)
 384         for row in rows:
 385             yield row
 386         rows = connection.execute(
 387                 'SELECT black_list.rowid, albums.name, artists.name'
 388                 ' FROM artists, albums INNER JOIN black_list'
 389                 ' ON albums.id = black_list.album'
 390                 ' WHERE artists.id = albums.artist')
 391         yield ('',)
 392         yield ('Row ID', 'Album', 'Artist name')
 393         for row in rows:
 394             yield row
 395         rows = connection.execute(
 396                 'SELECT black_list.rowid, tracks.name, artists.name'
 397                 ' FROM artists, tracks INNER JOIN black_list'
 398                 ' ON tracks.id = black_list.track'
 399                 ' WHERE tracks.artist = artists.id')
 400         yield ('',)
 401         yield ('Row ID', 'Title', 'Artist name')
 402         for row in rows:
 403             yield row
 404         self.close_database_connection(connection)
 405
 406     def _set_mbid(self, artist_id=None, mbid=None, with_connection=None):
 407         """get artist information from the database.
 408         if not in database insert new entry."""
 409         if with_connection:
 410             connection = with_connection
 411         else:
 412             connection = self.get_database_connection()
 413         connection.execute("UPDATE artists SET mbid = ? WHERE id = ?",
 414             (mbid, artist_id))
 415         connection.commit()
 416         if not with_connection:
 417             self.close_database_connection(connection)
 418
 419     def _get_similar_artists_from_db(self, artist_id):
 420         connection = self.get_database_connection()
 421         results = [row for row in connection.execute(
 422             "SELECT match, name FROM usr_artist_2_artist INNER JOIN"
 423             " artists ON usr_artist_2_artist.artist2 = artists.id WHERE"
 424             " usr_artist_2_artist.artist1 = ? ORDER BY match DESC;",
 425             (artist_id,))]
 426         self.close_database_connection(connection)
 427         for score, artist in results:
 428             yield {'score': score, 'artist': artist}
 429
 430     def _get_reverse_similar_artists_from_db(self, artist_id):
 431         connection = self.get_database_connection()
 432         results = [row for row in connection.execute(
 433             "SELECT name FROM usr_artist_2_artist INNER JOIN"
 434             " artists ON usr_artist_2_artist.artist1 = artists.id WHERE"
 435             " usr_artist_2_artist.artist2 = ?;",
 436             (artist_id,))]
 437         self.close_database_connection(connection)
 438         for artist in results:
 439             yield artist[0]
 440
 441     def get_similar_artists(self, artist_name):
 442         """get similar artists from the database sorted by descending
 443         match score"""
 444         artist_id = self.get_artist(artist_name)[0]
 445         for result in self._get_similar_artists_from_db(artist_id):
 446             yield result
 447
 448     def _get_artist_match(self, artist1, artist2, with_connection=None):
 449         """get artist match score from database"""
 450         if with_connection:
 451             connection = with_connection
 452         else:
 453             connection = self.get_database_connection()
 454         rows = connection.execute(
 455             "SELECT match FROM usr_artist_2_artist WHERE artist1 = ?"
 456             " AND artist2 = ?",
 457             (artist1, artist2))
 458         result = 0
 459         for row in rows:
 460             result = row[0]
 461             break
 462         if not with_connection:
 463             self.close_database_connection(connection)
 464         return result
 465
 466     def _remove_relation_between_2_artist(self, artist1, artist2):
 467         """Remove a similarity relation"""
 468         connection = self.get_database_connection()
 469         connection.execute(
 470             'DELETE FROM usr_artist_2_artist'
 471             ' WHERE artist1 = ? AND artist2 = ?;',
 472             (artist1, artist2))
 473         self.clean_database(with_connection=connection)
 474         self._update_artist(artist_id=artist1, with_connection=connection)
 475         connection.commit()
 476         self.close_database_connection(connection)
 477
 478     def _remove_artist(self, artist_id, deep=False, with_connection=None):
 479         """Remove all artist1 reference"""
 480         if with_connection:
 481             connection = with_connection
 482         else:
 483             connection = self.get_database_connection()
 484         if deep:
 485             connection.execute(
 486                 'DELETE FROM usr_artist_2_artist'
 487                 ' WHERE artist1 = ? OR artist2 = ?;',
 488                 (artist_id, artist_id))
 489             connection.execute(
 490                 'DELETE FROM artists WHERE id = ?;',
 491                 (artist_id,))
 492         else:
 493             connection.execute(
 494                 'DELETE FROM usr_artist_2_artist WHERE artist1 = ?;',
 495                 (artist_id,))
 496         self.clean_database(with_connection=connection)
 497         self._update_artist(artist_id=artist_id, with_connection=connection)
 498         if not with_connection:
 499             connection.commit()
 500             self.close_database_connection(connection)
 501
 502     def _remove_bl(self, rowid):
 503         """Remove bl row id"""
 504         connection = self.get_database_connection()
 505         connection.execute('DELETE FROM black_list'
 506                 ' WHERE black_list.rowid = ?', (rowid,))
 507         connection.commit()
 508         self.close_database_connection(connection)
 509
 510     def _insert_artist_match(
 511         self, artist1, artist2, match, with_connection=None):
 512         """write match score to the database.
 513         Does not update time stamp in table artist/*_updated"""
 514         if with_connection:
 515             connection = with_connection
 516         else:
 517             connection = self.get_database_connection()
 518         connection.execute(
 519             "INSERT INTO usr_artist_2_artist (artist1, artist2, match) VALUES"
 520             " (?, ?, ?)",
 521             (artist1, artist2, match))
 522         if not with_connection:
 523             connection.commit()
 524             self.close_database_connection(connection)
 525
 526     def add_history(self, track):
 527         """Add to history"""
 528         connection = self.get_database_connection()
 529         track_id = self.get_track(track, with_connection=connection)[0]
 530         rows = connection.execute("SELECT * FROM history WHERE track = ? ",
 531                                   (track_id,))
 532         if not rows.fetchone():
 533             connection.execute("INSERT INTO history (track) VALUES (?)",
 534                                (track_id,))
 535         connection.execute("UPDATE history SET last_play = DATETIME('now') "
 536                 " WHERE track = ?", (track_id,))
 537         connection.commit()
 538         self.close_database_connection(connection)
 539
 540     def _update_artist(self, artist_id, with_connection=None):
 541         """write artist information to the database"""
 542         if with_connection:
 543             connection = with_connection
 544         else:
 545             connection = self.get_database_connection()
 546         connection.execute(
 547             "UPDATE artists SET usr_updated = DATETIME('now') WHERE id = ?",
 548             (artist_id,))
 549         if not with_connection:
 550             connection.commit()
 551             self.close_database_connection(connection)
 552
 553     def _update_artist_match(
 554         self, artist1, artist2, match, with_connection=None):
 555         """write match score to the database"""
 556         if with_connection:
 557             connection = with_connection
 558         else:
 559             connection = self.get_database_connection()
 560         connection.execute(
 561             "UPDATE usr_artist_2_artist SET match = ? WHERE artist1 = ? AND"
 562             " artist2 = ?",
 563             (match, artist1, artist2))
 564         if not with_connection:
 565             connection.commit()
 566             self.close_database_connection(connection)
 567
 568     def _update_similar_artists(self, artist, similar_artists):
 569         """write user similar artist information to the database
 570         """
 571         # DOC:   similar_artists = list([{'score': match, 'artist': name}])
 572         #
 573         connection = self.get_database_connection()
 574         artist_id = self.get_artist(artist, with_connection=connection)[0]
 575         for artist in similar_artists:
 576             id2 = self.get_artist(
 577                 artist['artist'], with_connection=connection)[0]
 578             if self._get_artist_match(
 579                 artist_id, id2, with_connection=connection):
 580                 self._update_artist_match(
 581                     artist_id, id2, artist['score'],
 582                     with_connection=connection)
 583                 continue
 584             self._insert_artist_match(
 585                 artist_id, id2, artist['score'],
 586                 with_connection=connection)
 587         self._update_artist(artist_id, with_connection=connection)
 588         connection.commit()
 589         self.close_database_connection(connection)
 590
 591     def _clean_artists_table(self, with_connection=None):
 592         """Clean orphan artists"""
 593         if with_connection:
 594             connection = with_connection
 595         else:
 596             connection = self.get_database_connection()
 597         artists_ids = set([row[0] for row in connection.execute(
 598             "SELECT id FROM artists")])
 599         artist_2_artist_ids = set([row[0] for row in connection.execute(
 600             "SELECT artist1 FROM usr_artist_2_artist")] +
 601             [row[0] for row in connection.execute(
 602             "SELECT artist2 FROM usr_artist_2_artist")] +
 603             [row[0] for row in connection.execute(
 604             "SELECT artist FROM black_list")] +
 605             [row[0] for row in connection.execute(
 606             "SELECT artist FROM albums")] +
 607             [row[0] for row in connection.execute(
 608             "SELECT artist FROM tracks")])
 609         orphans = [ (orphan,) for orphan in artists_ids - artist_2_artist_ids ]
 610         connection.executemany('DELETE FROM artists WHERE id = (?);', orphans)
 611         if not with_connection:
 612             connection.commit()
 613             self.close_database_connection(connection)
 614
 615     def _clean_albums_table(self, with_connection=None):
 616         """Clean orphan albums"""
 617         if with_connection:
 618             connection = with_connection
 619         else:
 620             connection = self.get_database_connection()
 621         orphan_black_ids = set([row[0] for row in connection.execute(
 622             """SELECT albums.id FROM albums
 623             LEFT JOIN black_list ON albums.id = black_list.album
 624             WHERE ( black_list.album IS NULL )""")])
 625         orphan_tracks_ids = set([row[0] for row in connection.execute(
 626             """SELECT albums.id FROM albums
 627             LEFT JOIN tracks ON albums.id = tracks.album
 628             WHERE tracks.album IS NULL""")])
 629         orphans = [ (orphan,) for orphan in orphan_black_ids & orphan_tracks_ids ]
 630         connection.executemany('DELETE FROM albums WHERE id = (?);', orphans)
 631         if not with_connection:
 632             connection.commit()
 633             self.close_database_connection(connection)
 634
 635     def _clean_tracks_table(self, with_connection=None):
 636         """Clean orphan tracks"""
 637         if with_connection:
 638             connection = with_connection
 639         else:
 640             connection = self.get_database_connection()
 641         hist_orphan_ids = set([row[0] for row in connection.execute(
 642             """SELECT tracks.id FROM tracks
 643             LEFT JOIN history ON tracks.id = history.track
 644             WHERE history.track IS NULL""")])
 645         black_list_orphan_ids = set([row[0] for row in connection.execute(
 646             """SELECT tracks.id FROM tracks
 647             LEFT JOIN black_list ON tracks.id = black_list.track
 648             WHERE black_list.track IS NULL""")])
 649         orphans = [ (orphan,) for orphan in hist_orphan_ids & black_list_orphan_ids ]
 650         connection.executemany('DELETE FROM tracks WHERE id = (?);', orphans)
 651         if not with_connection:
 652             connection.commit()
 653             self.close_database_connection(connection)
 654
 655     def clean_database(self, with_connection=None):
 656         """Wrapper around _clean_* methods"""
 657         if with_connection:
 658             connection = with_connection
 659         else:
 660             connection = self.get_database_connection()
 661         self._clean_tracks_table(with_connection=connection)
 662         self._clean_albums_table(with_connection=connection)
 663         self._clean_artists_table(with_connection=connection)
 664         connection.execute("VACUUM")
 665         if not with_connection:
 666             connection.commit()
 667             self.close_database_connection(connection)
 668
 669     def purge_history(self, duration=__HIST_DURATION__):
 670         """Remove old entries in history"""
 671         connection = self.get_database_connection()
 672         connection.execute("DELETE FROM history WHERE last_play"
 673                 " < datetime('now', '-%i hours')" % duration)
 674         connection.commit()
 675         self.close_database_connection(connection)
 676
 677     def _set_dbversion(self):
 678         """Add db version"""
 679         connection = self.get_database_connection()
 680         connection.execute('INSERT INTO db_info (version, name) VALUES (?, ?)',
 681                 (__DB_VERSION__, 'Sima DB'))
 682         connection.commit()
 683         self.close_database_connection(connection)
 684
 685     def create_db(self):
 686         """ Set up a database for the artist similarity scores
 687         """
 688         connection = self.get_database_connection()
 689         connection.execute(
 690             'CREATE TABLE IF NOT EXISTS db_info'
 691             ' (version INTEGER, name CHAR(36))')
 692         connection.execute(
 693             'CREATE TABLE IF NOT EXISTS artists (id INTEGER PRIMARY KEY, name'
 694             ' VARCHAR(100), mbid CHAR(36), lfm_updated DATE, usr_updated DATE)')
 695         connection.execute(
 696             'CREATE TABLE IF NOT EXISTS usr_artist_2_artist (artist1 INTEGER,'
 697             ' artist2 INTEGER, match INTEGER)')
 698         connection.execute(
 699             'CREATE TABLE IF NOT EXISTS lfm_artist_2_artist (artist1 INTEGER,'
 700             ' artist2 INTEGER, match INTEGER)')
 701         connection.execute(
 702             'CREATE TABLE IF NOT EXISTS albums (id INTEGER PRIMARY KEY,'
 703             ' artist INTEGER, name VARCHAR(100), mbid CHAR(36))')
 704         connection.execute(
 705             'CREATE TABLE IF NOT EXISTS tracks (id INTEGER PRIMARY KEY,'
 706             ' name VARCHAR(100), artist INTEGER, album INTEGER,'
 707             ' file VARCHAR(500), mbid CHAR(36))')
 708         connection.execute(
 709             'CREATE TABLE IF NOT EXISTS black_list (artist INTEGER,'
 710             ' album INTEGER, track INTEGER, updated DATE)')
 711         connection.execute(
 712             'CREATE TABLE IF NOT EXISTS history (last_play DATE,'
 713             ' track integer)')
 714         connection.execute(
 715           "CREATE INDEX IF NOT EXISTS a2aa1x ON usr_artist_2_artist (artist1)")
 716         connection.execute(
 717           "CREATE INDEX IF NOT EXISTS a2aa2x ON usr_artist_2_artist (artist2)")
 718         connection.execute(
 719         "CREATE INDEX IF NOT EXISTS lfma2aa1x ON lfm_artist_2_artist (artist1)")
 720         connection.execute(
 721         "CREATE INDEX IF NOT EXISTS lfma2aa2x ON lfm_artist_2_artist (artist2)")
 722         connection.commit()
 723         self.close_database_connection(connection)
 724         self._set_dbversion()
 725
 726
 727 def main():
 728     db = SimaDB(db_path='/tmp/sima.db')
 729     db.purge_history(int(4))
 730     db.clean_database()
 731
 732
 733 # Script starts here
 734 if __name__ == '__main__':
 735     main()
 736
 737 # VIM MODLINE
 738 # vim: ai ts=4 sw=4 sts=4 expandtab