致命错误：未捕获错误：调用 C:\\xampp\\htdocs\\phpmvc\\app\\models\\Mahasiswa_model.php:31 中未定义的函数 query()

Question

I'm trying to make an mvc framework like ci, but I have a problem with this error. the error "Call to undefined function query()" but it's weird since query() works fine in method getMahasiswaById() .

Fatal error: Uncaught Error: Call to undefined function query() in C:\\xampp\\htdocs\\phpmvc\\app\\models\\Mahasiswa_model.php:31 Stack trace: #0 C:\\xampp\\htdocs\\phpmvc\\app\\controllers\\Mahasiswa.php(27): Mahasiswa_model->tambahMahasiswa(Array) #1 C:\\xampp\\htdocs\\phpmvc\\app\\core\\App.php(35): Mahasiswa->tambah() #2 C:\\xampp\\htdocs\\phpmvc\\public\\index.php(5): App->__construct() #3 {main} thrown in C:\\xampp\\htdocs\\phpmvc\\app\\models\\Mahasiswa_model.php on line 31

This my model:

class Mahasiswa_model {

    private $table = 'mahasiswa';
    private $db;

    public function __construct()
    {
        $this->db = new Database;
    }

    public function getMahasiswa()
    {
        $this->db->query('SELECT * FROM '.$this->table);
        return $this->db->resultSet();
    }

    public function getMahasiswaById($id)
    {
        $this->db->query('SELECT * FROM '.$this->table.' WHERE id=:id');
        $this->db->bind('id', $id);
        return $this->db->single();
    }

    public function tambahMahasiswa($data)
    {
        $query = "INSERT INTO mahasiswa 
                    VALUES ('', :nama, :nim, :email, :jurusan)";

        $this->db-query($query);
        $this->db->bind('nama', $data['nama']);
        $this->db->bind('nim', $data['nim']);
        $this->db->bind('email', $data['email']);
        $this->db->bind('jurusan', $data['jurusan']);

        $this->db->execute();

        return $this->db->rowCount();
    }
}

This my controller:

<?php

class Mahasiswa extends Controller {

    public function index()
    {
        $data['title'] = 'List Mahasiswa';

        $data['mhs'] = $this->model('Mahasiswa_model')->getMahasiswa();
        $this->view('templates/header', $data);
        $this->view('mahasiswa/index', $data);
        $this->view('templates/footer');
    }

    public function detail($id)
    {
        $data['title'] = 'Detail Mahasiswa';

        $data['mhs'] = $this->model('Mahasiswa_model')->getMahasiswaById($id);
        $this->view('templates/header', $data);
        $this->view('mahasiswa/detail', $data);
        $this->view('templates/footer');
    }

    public function tambah()
    {
        if ($this->model('Mahasiswa_model')->tambahMahasiswa($_POST) > 0) {
            header ('Location: '. BASEURL .'/mahasiswa');
        }
    }
}

This my core Database.php

<?php

class Database {

    private $host = DB_HOST;
    private $user = DB_USERNAME;
    private $pass = DB_PASSWORD;
    private $db_name = DB_NAME;

    private $dbh;
    private $stmt;

    public function __construct()
    {
        //data source name
        $dsn = 'mysql:host='.$this->host.';dbname='.$this->db_name;

        $option = [
            PDO::ATTR_PERSISTENT => true,
            PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION
        ];

        try {
            $this->dbh = new PDO($dsn, $this->user, $this->pass, $option);
        } catch(PDOExeption $e) {
            die($e->getMessage());
        }
    }

    public function query($query)
    {
        $this->stmt = $this->dbh->prepare($query);
    }

    public function bind($param, $value, $type = null)
    {
        if(is_null($type)) {
            switch(true) {
                case is_int($value) :
                    $type = PDO::PARAM_INT;
                    break;
                case is_bool($value) :
                    $type = PDO::PARAM_BOOL;
                    break;
                case is_null($value) :
                    $type = PDO::PARAM_NULL;
                    break;
                default :
                    $type = PDO::PARAM_STR;
            }
        }
        $this->stmt->bindValue($param, $value, $type);
    }

    public function execute()
    {
        $this->stmt->execute();
    }

    public function resultSet()
    {
        $this->execute();
        return $this->stmt->fetchAll(PDO::FETCH_ASSOC);
    }

    public function single()
    {
        $this->execute();
        return $this->stmt->fetch(PDO::FETCH_ASSOC);
    }

    public function rowCount()
    {
        return $this->stmt->rowCount();
    }
}

Answer 1

Simple syntax error:

$this->db-query($query);

See what you are missing there?

$this->db->query($query);