gistfile1.txt

    Statement *stmt = [database statementWithQuery:@"PRAGMA index_info(statuses_retweeted_status_id)"];
    [stmt step];
    NSString *val = [stmt getUTF8String:2];
    if ([val isEqualToString:@"retweeted_status"] == NO) {
        [dbm close:database];
        [dbm unlink:filename];
        database = [dbm open:filename];
    }