Using hibernate/hql to truncate a table?

Question

What is the recommended way to truncate a table using hibernate/hql?

I\'ve tried this:

 Query query = session.createQuery(\"truncate table MyTable\");
 qu         


        

Answer 1

I used the delete syntax in an HQL to maintain portability. Works great:

public abstract class GenericDAOImpl implements GenericDAO {

private Class persistentClass;

// Balance of dao methods snipped... :)

/**
 * Clears all records from the targetted file.
 * @throws DAOException
 */
public int truncate() throws DAOException {
    Session s = getSession();
    int rowsAffected = 0;
    try {
        Class c = getPersistentClass();
        String hql = "delete from " + c.getSimpleName();
        Query q = s.createQuery( hql );
        rowsAffected = q.executeUpdate();
    } catch ( HibernateException e ) {
        throw new DAOException( "Unable to truncate the targetted file.", e );
    }
    return rowsAffected;
}
/**
 * Returns a Class object that matches target Entity.
 *
 * @return Class object from constructor
 */
public Class getPersistentClass() {
    return persistentClass;
}

Works great and totally truncates the targeted table. Use with caution as your db server will perform this statement with great efficiency... :)