	function unlockTables() {
        $sql = "UNLOCK TABLES";

        $res = mysqli_query($this->connection, $sql);
        return $res;
    }
The software constructs all or part of a command, data structure, or record using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify how it is parsed or interpreted when it is sent to a downstream component.