The repository class can not use two functions of one class

[huiyonghkw]

classA.php

use A\B\C\ClassB;

classA
{
    public $b;

    public function __construct(ClassB $b)
    {
        $this->b = $b;
    }

    public function func1()
    {
       $this->b->update(1, ["a"=>1, "b" => 2]);

       $this->func2();
    }

    public function func2()
    {
        $this->b->where(1)->where('a'=>'1')->get();
    }

}

like above function func2，$this->b can not use where fucntion to query