How do you update only the modified fields in the Hibernate fields without updating them?? (3 medium method)

1. Modify annotations: Specify that a property is: @Column (updatable=false), which means that a column is not in the updated range. You can also specify update in the property properties of the XML. Less use, no flexibility

2.xml: Set the attribute Dynamic-update for class in the XML configuration file, such as:

<class name= "Student" dynamic-update= "true" >. During the session, it is not possible to rely on dynamic-update, so use the merge. Session2.merge (s); there is no corresponding setting in the JPA standard annotation, and hibernate extends the corresponding functionality.

3.hql| EJBQL statement: Query q=session.createquery ("Update Student s set s.name= ' John ' where S.id=1");(recommended)