DB Manager Class

<?php

/**
 * DbManager
 * Managing database connection
 *
 * @author Matt23
 * @version 1.0
 */
class DbManager
{
    protected $hostname;
    protected $username;
    protected $password;
    protected $database;

    protected $connection;
    protected $isConnected;
    protected $error;

    public function __construct($hostname, $username, $password, $database)
    {
        $this->hostname = $hostname;
        $this->username = $username;
        $this->password = $password;
        $this->database = $database;
    }

    protected function connect()
    {
        try
        {
            $connection = new PDO("mysql:host=$this->hostname;dbname=$this->database", $this->username, $this->password);
            $connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
            $connection->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);

            $this->connection = $connection;
            $this->isConnected = true;
        }
        catch (PDOException $e)
        {
            $this->isConnected = false;
            $this->error = $e->getMessage();
        }
    }

    protected function getError()
    {
        return $this->error;
    }

    public function addVisitor($ip)
    {
        $this->connect();
        if ($this->isConnected)
        {
            try
            {
                $visitor = $this->connection->prepare('INSERT INTO visitors (ip) VALUES (?)');
                $visitor->bindParam(1, $ip, PDO::PARAM_STR);
                $visitor->execute();
                return array('success' => 'ok');
            }
            catch (PDOException $e)
            {
                return array('success' => 'no', 'message' => $e->getMessage());
            }
        }
        else
        {
            return array('success' => 'no', 'message' => $this->getError());
        }
    }

    public function addEntry($entryId, $voteCount, $maleCount, $femaleCount, $unknownCount, $ip)
    {
        $this->connect();
        if ($this->isConnected)
        {
            try
            {
                $entry = $this->connection->prepare('INSERT INTO entries (entry_id, votes, men, women, unknown, ip) VALUES (?, ?, ?, ?, ?, ?)');
                $entry->bindParam(1, $entryId, PDO::PARAM_INT);
                $entry->bindParam(2, $voteCount, PDO::PARAM_INT);
                $entry->bindParam(3, $maleCount, PDO::PARAM_INT);
                $entry->bindParam(4, $femaleCount, PDO::PARAM_INT);
                $entry->bindParam(5, $unknownCount, PDO::PARAM_INT);
                $entry->bindParam(6, $ip, PDO::PARAM_STR);
                $entry->execute();
                return array('success' => 'ok');
            }
            catch (PDOException $e)
            {
                return array('success' => 'no', 'message' => $e->getMessage());
            }
        }
        else
        {
            return array('success' => 'no', 'message' => $this->getError());
        }
    }

    public function addComment($entryId, $commentId, $voteCount, $maleCount, $femaleCount, $unknownCount, $ip)
    {
        $this->connect();
        if ($this->isConnected)
        {
            try
            {
                $comment = $this->connection->prepare('INSERT INTO comments (entry_id, comment_id, votes, men, women, unknown, ip) VALUES (?, ?, ?, ?, ?, ?, ?)');
                $comment->bindParam(1, $entryId, PDO::PARAM_INT);
                $comment->bindParam(2, $commentId, PDO::PARAM_INT);
                $comment->bindParam(3, $voteCount, PDO::PARAM_INT);
                $comment->bindParam(4, $maleCount, PDO::PARAM_INT);
                $comment->bindParam(5, $femaleCount, PDO::PARAM_INT);
                $comment->bindParam(6, $unknownCount, PDO::PARAM_INT);
                $comment->bindParam(7, $ip, PDO::PARAM_STR);
                $comment->execute();
                return array('success' => 'ok');
            }
            catch (PDOException $e)
            {
                return array('success' => 'no', 'message' => $e->getMessage());
            }
        }
        else
        {
            return array('success' => 'no', 'message' => $this->getError());
        }
    }
}


// Example action
//
//$conn = new DbManager(DB_HOST, DB_USER, DB_PASSWORD, DB_DATABASE);
//$conn->addEntry($id[1], $vote_count, $sex['male'], $sex['female'], $sex['unknown'], $_SERVER['REMOTE_ADDR']);
//