hibernate column should be mapped with insert="false" update="false"

<hibernate-mapping package="com.huapu.networkmanage.db.hibernate">
?<class
??name="SyslogLogstack"
??table="SYSLOG_LOGSTACK"
?>
??<meta attribute="sync-DAO">false</meta>
??<id
???name="Id"
???type="integer"
???column="LOGSTACK_ID"
??>
?? <generator update="false")