gistfile1.php

<?php

        // Onde $this->em recebe o EntityManager 
        
        $sql  =  'SELECT id,titulo FROM posts';
        $stmt = $this->em->getConnection()->prepare($sqlSlug);
        $stmt->bindValue(1, $slugPost);
                
        try {
            $stmt->execute();
        }
        catch(\Exception $e) {
          echo $e->getMessage(); 
          exit();   
        }
        $rs = $stmt->fetch();