58 lines
2.0 KiB
Python
58 lines
2.0 KiB
Python
import argparse
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import os
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import sqlite3
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import sys
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MIGRATE_QUERY = '''
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INSERT INTO {tablename}
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SELECT othertable.* FROM other.{tablename} othertable
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LEFT JOIN {tablename} mytable ON mytable.id == othertable.id
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WHERE mytable.id IS NULL AND {where_clause};
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'''
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def _migrate_helper(sql, tablename, where_clause='1==1'):
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query = MIGRATE_QUERY.format(tablename=tablename, where_clause=where_clause)
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print(query)
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oldcount = sql.execute('SELECT count(*) FROM %s' % tablename).fetchone()[0]
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sql.execute(query)
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sql.commit()
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newcount = sql.execute('SELECT count(*) FROM %s' % tablename).fetchone()[0]
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print('Gained %d items.' % (newcount - oldcount))
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def merge_db(from_db_path, to_db_path, channel):
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to_db = sqlite3.connect(to_db_path)
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from_db = sqlite3.connect(from_db_path)
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to_version = to_db.execute('PRAGMA user_version').fetchone()[0]
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from_version = from_db.execute('PRAGMA user_version').fetchone()[0]
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if to_version != from_version:
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raise Exception(f'Databases have different versions: to={to_version}, from={from_version}.')
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to_db.execute('ATTACH DATABASE "%s" AS other' % from_db_path)
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if channel == '*':
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_migrate_helper(to_db, 'channels')
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_migrate_helper(to_db, 'videos')
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else:
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_migrate_helper(to_db, 'channels', where_clause=f'othertable.id == "{channel}"')
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_migrate_helper(to_db, 'videos', where_clause=f'othertable.author_id == "{channel}"')
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def merge_db_argparse(args):
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return merge_db(args.from_db_path, args.to_db_path, args.channel)
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def main(argv):
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parser = argparse.ArgumentParser(description=__doc__)
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parser.add_argument('--from_db_path', dest='from_db_path', required=True)
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parser.add_argument('--to_db_path', dest='to_db_path', required=True)
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parser.add_argument('--channel', dest='channel', required=True)
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parser.set_defaults(func=merge_db_argparse)
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args = parser.parse_args(argv)
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return args.func(args)
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if __name__ == '__main__':
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raise SystemExit(main(sys.argv[1:]))
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