Automatic Dirty Checking not working...

mburbidg · **Joined:** Sun Sep 11, 2005 1:16 am **Posts:** 5

Hibernate version: 2.1.8

Mapping documents:

Code:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate//Hibernate Mapping DTD//EN"
        "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
    <class name="com.flysafe.business.Product" table="PRODUCTS">
        <id name="id">
            <generator class="native"/>
        </id>
        <property name="description"/>
        <property name="price"/>
    </class>
</hibernate-mapping>

Code between sessionFactory.openSession() and session.close():

Code:

            Session session = productDao.getSessionFactory().openSession();
            Transaction tx = session.beginTransaction();

            products = productDao.findAll();

            ListIterator i = products.listIterator();
            while (i.hasNext())
            {
                Product product = (Product) i.next();
                product.increasePrice(increase);
                //productDao.saveProduct(product);
            }

            tx.commit();
            session.close();

Full stack trace of any exception that occurs: No exception occured.

Name and version of the database you are using: HSQLDB

I'm using hibernate with spring. I was expecting that the above code would update the database because of the "Automatic Dirty Checking" features of hibernate. But it doesn't.

If I uncomment the line productDao.saveProduct(product) which updates the database explicity then things work.

What additional thing must I do to get "Automatic Dirty Checking" to work in this case?

d · **Joined:** Mon Jul 04, 2005 5:19 pm **Posts:** 720

ADC isn't as that automatic. Nothing get's persisted unless the Session is told so ... that is probably what your doing in productDao.saveProduct(product) .

max · **Posted:** Sun Sep 11, 2005 10:27 am

hibernate should detect that change as long as it is the same session that the query and transaction is related to.

mburbidg · **Joined:** Sun Sep 11, 2005 1:16 am **Posts:** 5

The line of code

Code:

products = productDao.findAll();

called into HibernateTemplate to actually do the query. HibernateTemplate is a class in the Spring Framework. It opened a new session to do the query so that the query was not in the same session and the code that made the modifications.

I fixed the problem by replacing the above Spring based line of code to a pure Hibernate based line of code as follows:

Code:

products = session.find("from Product");

I'm sure there is a way to used the Spring Hibernate support and have this work. Maybe with the Spring transaction support. I'm still pretty new at both Spring and Hibernate.