Unable to connect to database - cannot find error messages

PHP Code:

// For getting records hasError()
if ($query->hasError())
{
        echo 'Code: '. $query->getErrorCode();
        echo 'Error: '. $query->getErrorMessage();
}

// For writing records
$error = $this->db->error();
echo $error;
exit(); 


What did you Try? What did you Get? What did you Expect?

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