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[Hibernate] hql question

Is there a term (like READ or READ ONLY) that can be placed on a hql query that specifies the query is just reading database information?  If there is what is the advantage of using the term?    __Do You Yahoo!?Tired of spam? Yahoo! Mail has the best

[Hibernate] Oracle and IS NULL and IS NOT NULL

our project is presently converting over from using Castor to using Hibernate.  In Castor the IS NULL and IS NOT NULL used on where clauses aren't supported directly, but are supported through the is_defined and is_undefined macros. has anyone used IS NULL and IS NOT NULL successfully in Hibernate.