php事务回滚不了怎么办

Mysqliphptransactions
Transactions not doing the rollback

function update_user_set_common($date_of_birth, $mobile, $street, $housenumber, $addition, $postal_code, $location, $country)
{
    try {
        $this->mysqli->begin_transaction();
        $this->update_user_set_date_of_birth($date_of_birth);
        $this->update_user_set_mobile($mobile);
        $this->update_user_set_address($street, $housenumber, $addition, $postal_code, $location, $country);
        $this->mysqli->commit();
        return true;
    } catch (Exception $e) {
        $this->mysqli->rollback();
        echo"Error:" . $e;
        return false;
    }
}

function update_user_set_date_of_birth($date_of_birth)
{
    return $this->update_user_set_singlefield(COL_USER_DATE_OF_BIRTH, $date_of_birth);
}
function update_user_set_singlefield($field, $value)
{
    if ($update_stmt = $this->mysqli->prepare("UPDATE" . TABLE_USER ." SET" . $field ." = ? WHERE" . COL_USER_ID ." = ?")) :
        if (!$update_stmt->bind_param("ss", $value, $this->USER_ID)) :
            $update_stmt->close();
            return false;
        endif;
        if (!$update_stmt->execute()) :
            $update_stmt->close();
            return false;
        else :
            $update_stmt->close();
            return true;
        endif;
    else :
        return false;
    endif;
}

CREATE TABLE `USER` (
  `USER_ID` bigint(20) NOT NULL PRIMARY KEY AUTO_INCREMENT,
  `USER_E_MaiL` varchar(255) COLLATE utf8_bin NOT NULL,
  `USER_PASSWORT` varchar(255) COLLATE utf8_bin NOT NULL,
  `USER_PASSWORT_SALT` varchar(255) COLLATE utf8_bin NOT NULL,
  `USER_FIRSTNAME` varchar(255) COLLATE utf8_bin NOT NULL,
  `USER_LASTNAME` varchar(255) COLLATE utf8_bin NOT NULL,
  `USER_DATE_OF_BIRTH` varchar(200) COLLATE utf8_bin DEFAULT NULL,
  `USER_MOBILE` varchar(255) COLLATE utf8_bin DEFAULT NULL,
  `ADDRESS_ID` bigint(20) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_bin;

$this->mysqli->autocommit(false);