Fatal error : Undetected error: Call to a member function run() on bool in C:

Question

The following error in my code is occurring:

Warning : PDO :: query(): SQLSTATE [HY000]: General error: the mode must be an integer in C: xampp htdocs joel_php curso_hcode DAO
sql.php on line 34

Fatal error : Error not detected: Call to a member function execute () on bool in C: xampp htdocs joel_php curso_hcode
DAO sql.php: 35 Stack tracking: #0 C: xampp htdocs
joel_php curso_hcode DAO indexx.php (7): Sql-> select ('SELECT * FROM t ...') #1 {main} released in C: xampp htdocs joel_php
curso_hcode DAO sql.php on line 35

class Sql extends PDO{

    private $conn;

    public function __construct(){

        $this->conn = new PDO("mysql:host=localhost;dbname=dbphp7","root","");
        echo "funcione";
    }

    private function setParams($statment,$paraneters = array()){
        foreach($paraneters as $key =>$value){
            $this->setParam($statment,$key,$value);
            
        }
    }

    
    private function setParam($statment,$key,$value){
        $statment->bindParam(":{$key}",$value);
    }

    public function execQuery($rawQuery,$params = array()){
        $stmt = $this->conn->prepare($rawQuery);
        $this->setParams($stmt,$params);
         $stmt->execute();

         return $stmt;
    }

    public function select($rawQuery,$params = array()):array{
        $stmt = $this->conn->query($rawQuery,$params);
        return $stmt->fetchAll(PDO::FETCH_ASSOC);
    }
}

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