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 transparent persistence (new window). Note that the same code would used for object databases (new window). 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();

Related books at Amazon.com

	Object-oriented Data Structures Using Java by Nell B. Dale, Daniel T. Joyce, Chip Weems Average Customer Review: based on 3 reviews. Customer Review: This seller was very punctual with the shipping and delivery of the book and it was in very good condition like the ad had stipulated. I will recomment him to anyone ST
	Objects, Abstraction, Data Structures and Design: Using Java version 5.0 by Elliot B. Koffman, Paul A. T. Wolfgang Average Customer Review: based on 2 reviews. Customer Review: Fails to address threading/concurrency issues. You will not find coverage of the new Concurrency Utilities including the new collection classes in package java.util.concurrent. You will not find the following terms in the index: concurrency synchronized thread thread-safe
	Java Data Objects by David Jordan, Craig Russell Average Customer Review: based on 11 reviews. Customer Review: This book is definitely the best on java data objects! i have read the one from prentice hall and addison wesley`s. its true that the first code example doesnt work, what is a shame but if you overcome your frustration and have a look at the oreilly website you can fond the correct and again detailed information (and even reason) to...
	Objects, Abstraction, Data Structures and Design: Using Java by Elliot B. Koffman, Paul A. T. Wolfgang Publisher: Wiley Publication Date: August 2004
	Data Structures and Software Development in an Object Oriented Domain, Java Edition by Jean-Paul Tremblay, Grant A. Cheston Publisher: Prentice Hall Publication Date: August 2002

More related books: Search Amazon.com for "Java Data Objects"

Information on becoming a sponsor

JDO and object-relational mapping

Related recent articles from Google News

Related books at Amazon.com