Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error

Question

this error happened while i was trying to create an insert query

Fatal error: Uncaught PDOException: SQLSTATE[HY000]: General error in E:\xammp\htdocs\school\private\core\database.php:29 Stack trace: #0 E:\xammp\htdocs\school\private\core\database.php(29): PDOStatement->fetchAll(5) #1 E:\xammp\htdocs\school\private\core\model.php(40): Database->query('insert into use...', Array) #2 E:\xammp\htdocs\school\private\controllers\Home.php(18): Model->insert(Array) #3 E:\xammp\htdocs\school\private\core\app.php(33): Home->index() #4 E:\xammp\htdocs\school\public\index.php(6): App->__construct() #5 {main} thrown in E:\xammp\htdocs\school\private\core\database.php on line 29

this is the query

public function query($query, $data = array(),$data_type = "object"){
  

        $con = $this -> connect();
        $stm = $con->prepare($query);  

        if($stm){
            $check = $stm -> execute($data);//check if the statment excuted or it went well
            if($check){
               if ($data_type == "object") {
                    $data = $stm->fetchAll(PDO::FETCH_OBJ);
               }else{
                    $data = $stm->fetchAll(PDO::FETCH_ASSOC);   
               }
               if(is_array($data) && count($data)){
                print_r($data);
               }
            }
        }

        return false;
    }

this is the insert method

public function insert($data)
{
    $keys = array_keys($data);
    $columns = implode(',', $keys);
    $values = implode(',:', $keys);

    $query = "insert into $this->table ($columns) values (:$values)";

    return $this -> query($query,$data);
    //insert to the table
}

Answer 1

An INSERT query does not generate anything fetchable. As you have observed, PDO gacks (gacks === throws an obscure exception) when you try to use .fetchAll() from a statement containing INSERT.