Класс обертки Mysqli by Koenig (Допилить)

<?php

class SQLParts 
{
    private $sql;
    
    private $start;
    
    private $table;
    
    private $fields = '*';
    
    private $data; // array
    
    private $objectId; // where id = ?
    
    public function setStart($start) 
    {
        $this->start = $start;
    }
    
    public function getStart() 
    {
        return $this->start;
    }
    
    public function setFields($fields) 
    {
        $this->fields = $fields;
    }
    
    public function getFields() 
    {
        return $this->fields;
    }
    
    public function setData(array $data) 
    {
        $this->data = $data;
    }
    
    public function getData() 
    {
        return $this->data;
    }
    
    public function setTable($table) 
    {
        $this->table = $table;
    }
    
    public function getTable() 
    {
        return $this->table;
    }
    
    public function setParams($args) 
    {
        foreach($args as $param => $value) {
            $method = 'set' . ucfirst($param);
            $this->$method($value);
        }
    }

    
}

// Strategy Pattern //
  
interface SqlTypeInterface
{
    public function init($args);
}

class SqlType extends SQLParts
{
    public function init($args)
    {
        $this->setParams($args);
    }
}

class SelectType extends SqlType implements SqlTypeInterface{}

class InsertType extends SqlType implements SqlTypeInterface{}

class UpdateType extends SqlType implements SqlTypeInterface{}

class DeleteType extends SqlType implements SqlTypeInterface{} 

class OtherType extends SqlType implements SqlTypeInterface{}

class SQLBuilder
{
    private $sql;
    
    private $type;

    public function type(SqlTypeInterface $type)
    {
        $this->type = $type;
        $this->type->setStart(strtolower(substr(get_class($this->type), 0, -4)));
        
        return $this;
    }

    public function initType($args)
    {
        return $this->type->init($args);
    }
    
    public function test() 
    {
        echo '<pre>' . print_r($this, 1) . '</pre>';
    }
    
}

$sql = new SQLBuilder;

$args = ['fields' => ['id', 'name'], 'table' => 'sqltable'];

$sql->type(new SelectType)->initType($args);
$sql->test();