public function __construct(DatabaseConnection $db)
 {
     parent::__construct($db);
     $this->cols = [];
     $this->distinct = false;
     $this->from = '';
 }
 public function __construct(DatabaseConnection $db)
 {
     parent::__construct($db);
     $this->ignore = false;
     $this->into = '';
     $this->columns = [];
     $this->values = [];
 }
 public function __construct(DatabaseConnection $db)
 {
     parent::__construct($db);
     $this->from = '';
 }
 public function __construct(DatabaseConnection $db)
 {
     parent::__construct($db);
     $this->table = '';
     $this->set = [];
 }