JDO and object databases

import javax.jdo.*;
import java.util.Collection;

PersistenceManagerFactory pmf; // assume this variable is set
pmf.setConnectionUserName("  ");
pmf.setConnectionPassword("  ");
pmf.setConnectionURL("database URL");
PersistenceManager pm = pmf.getPersistenceManager();
Transaction txn = pm.currentTransaction();

txn.begin();
Extent people = pm.getExtent(Person.class, false);

// perform query
Query query = pm.newQuery(Person.class, people, "name == \"Doug Barry\"");
Collection result = (Collection) query.execute();
    Iterator iter = result.iterator();

    // iterate over the results
    while ( iter.hasNext() )
    {
        Person person = (Person) iter.next();

        // do some addition processing on the person (not shown)

        // now traverse to the address object and update its value
        person.address.street = "13504 4th Avenue South";
    }

txn.commit();

 

 

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