Типы данных и модификатор доступа по умолчанию

<?php
/**
 * Created by PhpStorm.
 * User: RAE
 * Date: 29.08.2017
 * Time: 16:51
 */
include "SQLTable.php";
 
class SQLDatabase
{
    private const HOST = "localhost";
    private $ConnectionLink;
 
    //constructor
    private function __construct()
    {
    }
 
    private static function constructor()
    {
        $result = new SQLDatabase();
        return $result;
    }
 
    public static function Load($database, $login, $password = "")
    {
        $result = SQLDatabase::constructor();
        $result->ConnectionLink = mysqli_connect(SQLDatabase::HOST, $login, $password, $database);
        return $result;
    }
    //************
    //Объектные методы
    public function newTable($name, $architecture)
    {
        return SQLTable::createNew($this->ConnectionLink, $name, $architecture);
    }
 
    public function getTable($name)
    {
        return SQLTable::Load($this->ConnectionLink,$name);
    }
 
    public function dropTable($name)
    {
        mysqli_query($this->ConnectionLink, "DROP TABLE $name");
    }
 
    public function getID()
    {
        return $this->ConnectionLink;
    }
    //destructor
    public function __destruct()
    {
        mysqli_close($this->ConnectionLink);
    }
}

<?php
/**
 * Created by PhpStorm.
 * User: RAE
 * Date: 30.08.2017
 * Time: 19:49
 */
include "ThrowException.php";
 
class SQLTable
{
    private $Database;
    private $Name;
 
    //Вспомогательные методы
    private function query($query)
    {
        echo $Query = $query . ";";
        return mysqli_query($this->Database, $Query);
    }
 
    //constructor
    private function __construct()
    {
    }
 
    private static function constructor($databaseLink, $name)
    {
        $result = new SQLTable();
        $result->Database = $databaseLink;
        $result->Name = $name;
        return $result;
    }
 
    public static function Load($databaseLink, $name)
    {
        $result = SQLTable::constructor($databaseLink, $name);
        if (mysqli_num_rows($result->query("SHOW TABLES LIKE $name;")) === 0)
            throwException("Таблица $name не найдена в базе данных $databaseLink.");
        return $result;
    }
 
    public static function createNew($databaseLink, $name, $architecture)
    {
        $result = SQLTable::constructor($databaseLink, $name);
        $result->query("CREATE TABLE $name ($architecture)");
        return $result;
    }
    //***********
    //Объектные методы
    public function add($values)
    {
        query("INSERT INTO $this->Name VALUES($values)");
    }
 
    public function customAdd($fields, $values)
    {
        query("INSERT INTO $this->Name($fields) VALUES($values)");
    }
 
    public function select($options, $predicate = "")
    {
        return query("SELECT $options FROM $this->Name $predicate");
    }
 
    public function delete($predicate)
    {
        $this->query("DELETE FROM $this->Name $predicate");
    }
 
    public function update($fieldsUpdate, $predicate = "")
    {
        $this->query("UPDATE $this->Name SET $fieldsUpdate $predicate");
    }
}

<?php
/**
 * Created by PhpStorm.
 * User: RAE
 * Date: 02.09.2017
 * Time: 15:06
 */
include "SQLDatabase.php";
$db = SQLDatabase::Load("pings", "root");
$db->newTable("main","`name` varchar(20) NOT NULL AUTO_INCREMENT PRIMARY KEY,
    `sword` text NOT NULL,
    `ip` VARCHAR(11) NOT NULL");
echo "Succes!@";