            } elseif (strtolower($val)=='now()') {
                $w .= "`$key` = NOW(), ";
            } else {
                if (strpos($key,'.') === false) {
                    $w .= "`$key` = '".$this->escape($val)."' AND ";
                } else {
                    $w .= "$key = '".$this->escape($val)."' AND ";
                }
            }
        }
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.