JDO and Object-Relational Mapping

This example uses the Java Data Objects (JDO) Binding. Notice that all the code is Java. You will not find a database sub-language in this example. The part in blue relates to the animation of . Note that the same code would used for . Transparent persistent interfaces work with both object database or object-relational mapping products.

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();
Collection 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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