Recursion in SQLite Database is locked

I build something like tree using SQLite. I use recursion in my task:

$this->recursion($row['id']...

My code works in old MySQL, but not in SQLite.

I get Fatal error: Database is locked in... line where I have INSERT.

Because SELECT connection is using the database before INSERT.

And PHP insert only one records.

I used BeginTransaction and Commit, I used busyTimeout. It doesn't help me.

public function recursion($from, $to){
        $db = new SQLite3("db.sqlite");
        $stmt = $db->prepare('SELECT value, s_id, sex FROM table WHERE id='. $from);
        $result = $stmt->execute();
        $row = $result->fetchArray();
//'database is locked' in next line
        $db->exec('INSERT INTO table (id, s_id, value) VALUES (null,'. $to . $row['value'] .'");');     

        if ($row['sex']=='fem'){
            $stmt = $db->prepare('SELECT id FROM table WHERE s_id=' . $from);
            $result = $stmt->execute();
            while ($row = $result->fetchArray()){
                $this->recursion($row['id'], $db->lastInsertRowID());
            }
        }

}   




public function recursion($from, $to){      
        $res=mysql_connect($mysql_server,$mysql_user,$mysql_pass);
        mysql_select_db($mysql_db);

        $sql = 'SELECT value, s_id, s_id, sex FROM table WHERE id='. $from;
        $result = mysql_query($sql, $res);
        $row = mysql_fetch_array($result, MYSQL_ASSOC);

        mysql_query('INSERT INTO table (id, s_id, value) VALUES (null,'. $to . $row['value'] .'");', $res);     

        if ($row['sex']=='fem'){
            $sql = 'SELECT id FROM table WHERE s_id=' . $from;          
            $result = mysql_query($sql, $res);
            while ( $row = mysql_fetch_array($result, MYSQL_ASSOC) ) {
                $this->recursion($row['id'], mysql_insert_id());
            }
        }
}

I repeat that my code works in MySQL.

Any idea? Any hint? Thanks.