Query does not return values

Question

None of my querys return values, since they have data in my database. What could be happening in my code that is resulting in this? Follows the Code:

<?php
require_once("Usuario.php");
require_once("Conexao.php");
require_once("Crud.php");
class DaoUsuario implements Crud{
    private $status;
    private $tabela;

    public function __construct(){
        $this->$status = conexao::getConexao();
        $this->$tabela = "usuario";

    }

    public function consultar($id) {
        $query = "SELECT * FROM {$this->tabela} WHERE id=:id";
        try{
            $operacao = $this->status->prepare($query);
            $operacao->bindValue("id:",$id, PDO::PARAM_INT);
            $operacao->execute();
            $getRow = $operacao->fetch(PDO::FETCH_OBJ);
            $usuario = $getRow->usuario;
            $senha = $getRow->senha;
            $objeto = new Usuario($id, $usuario, $senha);
            $objeto->setId($id);
            return $objeto;
        } catch (PDOException $erro) {
            echo $erro->getMessage();
        }
    }

    public function criar($objeto) {
        $id = $this->getNewIdUsuario();
        $usuario = $this->getUsuario();
        $senha = $this->getSenha();
        $query = "INSERT INTO {$this->tabela} (id,usuario,senha) VALUES(:usuario, :senha)";
        try{
            $operacao = $this->status->prepare($query);
            $operacao->bindValue(":id",$id, PDO::PARAM_INT);
            $operacao->bindValue(":usuario",$usuario, PDO::PARAM_STR);
            $operacao->bindValue(":senha", $senha, PDO::PARAM_STR);
            if($operacao->execute()){
                if($operacao->rowCount() > 0){
                    $objeto->setId($id);
                    return true;
                } else{
                    return false;
                }
            }else{
                return false;
            }
        } catch (PDOException $erro) {
            echo $erro->getMessage();
        }

    }

    public function deletar($parametro) {
        $query = "DELETE FROM {$this->tabela} WHERE id=:id";
        try{
            $operacao = $this->status->prepare($query);
            $operacao->bindValue(":id",$id, PDO::PARAM_INT);
            if($operacao->execute()){
                if($operacao->rowCount() > 0){
                return true;
            }else{
                return false;
            }
            }else{
                return false;
            }
        } catch (PDOException $erro) {
            echo $erro->getMessage();

        }

    }

    public function modificar($objeto) {
        $id = $objeto->getId();
        $usuario = $objeto->getUsuario();
        $senha = $objeto->getSenha();
        $query = "UPDATE {$this->tabela} SET usuario=:usuario, senha=:senha WHERE id=:id";
        try{
            $operacao = $this->status->prepare($query);
            $operacao->bindValue(":id",$id, PDO::PARAM_INT);
            $operacao->bindValue(":usuario",$usuario, PDO::PARAM_STR);
            $operacao->bindValue(":senha",$senha, PDO::PARAM_STR);
            if($operacao->execute()){
                if($operacao->rowCount() > 0){
                    return true;
                }else{
                    return false;
                }
            }else{
                return false;
            }

        } catch (PDOException $erro) {
            echo $erro->getMessage();

        }

    }
    private function getNewIdUsuario(){
        $query = "SELECT MAX(id) AS id FROM {$this->tabela}";
        try{
            $operacao = $this->status->prepare($query);
            if($operacao->execute()){
                if($operacao->rowCount() > 0){
                    $getRow = $operacao->fetch(PDO::FETCH_OBJ);
                    $idReturn = (int) $getRow->id + 1;
                    return $idReturn;
                }else{
                    throw new Exception("Ocorreu um erro no Banco de Dados");
                    exit();
                }
            }else{
                throw new Exception("Ocorreu um erro no Banco de Dados");
                exit();
            }
        } catch (PDOException $erro) {
            echo $erro->getMessage();

        }
    }

}

When I’m gonna do a session:

<?php
    session_start();
    require_once('../Classes/DaoUsuario.php');

    $autentificar = new DaoUsuario;
    $usuario = $_POST['usuario'];
    $senha = $_POST['senha'];

        $autentificar->consultar($id);
        if(PDO::FETCH_ASSOC($autentificar)>1){
        $_SESSION['id'] = $id;
        $_SESSION['usuario'] = $usuario;
        header('Location: painel-de-controle.php');
    }else{
        header('Location: administrador.php');
        session_destroy();
    }
?>

My connection:

<?php
class Conexao {
   private static $conexao;
   private function __construct(){}
   private function __clone() {}
   private function __wakeup() {}

   public static function getConexao(){
       if(!isset(self::$conexao)){
           try{
            $banco = 'mysql:host=meu_servidor;dbname=nome_banco';
            $usuario = 'meu_usuario';
            $senha = 'minha_senha';
       }catch (PDOException $erro){
       echo $erro->getMessage();
       //Encerrando
       exit();
            }
        } 
       return self::$conexao;
    }
}

And returns the following error: Fatal error: Uncaught Error: Call to a Member Function prepare() on null in Daousuario.php on line 18

Answer 1

I know little about PHP and the framework you use, but looking briefly at its object $this->status result of conexao::getConexao() is void. Check the callback from conexao::getConexao().