<?php
class DbModel
{
  public $data;
  public $table;
  public $table_key = 'id';

  public function __construct( $id )
  {
    global $mdb;

    if ( $id )
    {
      $result = $mdb -> get( $this -> table, '*', [ $this -> table_key => $id ] );
      if ( is_array( $result ) ) foreach ( $result as $key => $val )
        $this -> $key = $val;
    }
  }

  public function __get( $variable )
  {
    if ( array_key_exists( $variable, $this -> data ) )
      return $this -> data[$variable];
  }

  public function __set( $variable, $value )
  {
    $this -> data[$variable] = $value;
  }

  public function save()
  {
    global $mdb;

    if ( $this -> __get( $this -> table_key ) )
    {
      $table_id_param = $this -> table_key;
      $table_id_value = $this -> __get( $this -> table_key );
      $data_tmp =  $this -> data;
      unset( $data_tmp[ $table_id_param ] );

      return $mdb -> update( $this -> table, $data_tmp, [ $table_id_param => $table_id_value ] );
    }
    else
    {
      $mdb -> insert( $this -> table, $this -> data );
      $this -> __set( $this -> table_key, $mdb -> id() );
    }
    return $this -> __get( $this -> table_key );
  }

  public function delete()
  {
    global $mdb;
    return $mdb -> delete( $this -> table, [ $this -> table_key => $this -> __get( $this -> table_key ) ] );
  }

}