<?php

namespace PicoDb;

class Sqlite extends \PDO {


    public function __construct($filename)
    {
        parent::__construct('sqlite:'.$filename);

        $this->exec('PRAGMA foreign_keys = ON');
    }


    public function getSchemaVersion()
    {
        $rq = $this->prepare('PRAGMA user_version');
        $rq->execute();
        $result = $rq->fetch(\PDO::FETCH_ASSOC);

        if (isset($result['user_version'])) {

            return $result['user_version'];
        }

        return 0;
    }


    public function setSchemaVersion($version)
    {
        $this->exec('PRAGMA user_version='.$version);
    }


    public function getLastId()
    {
        return $this->lastInsertId();
    }


    public function escapeIdentifier($value)
    {
        return '"'.$value.'"';
    }
}