Using Oracle squence in Hibernate

[gi tos]

Hello,

I want to use an Oracle sequence with hibernate.

the problem is that the sequence will not be use as an ID. But to update a field when some conditions are available.

so I want to do something like this:

update MY_TABLE set NUM_VAL = select MY_SEQ.nextval

I found many examples but all of theme are talking about a sequence that is user as an ID:

<id name="id" type="java.lang.Integer">
    <column name="ID_PRODUCT" />
    <generator class="sequence-identity" >
        <param name="sequence">PRODUCT_ID_SEQ</param>
    </generator>
</id>