'<h2 class=abstract>Tutorial overview: O-O database programming in Java</h2><p class=abstract>Typical Java applications involve access to a database system.  Database systems store data according to their type system, even object-oriented databases generally have their own storage structures. It is therefore necessary to convert Java objects as they are stored in a database, and to re-convert them when they are read.  Ideally, this should be done behind the scenes by a support package. <p class=abstract>This tutorial explores the issues involved: which database technologies are available (legacy vs. relational vs. object-oriented) and which access mechanisms (JDBC, OPJ, TOPLink, etc.) are best suited. <p class=abstract>The tutorial has two parts:<ul><li class=abstract>1. Accessing a relational database using the Java Database Connectivity (JBDC) package</li><p class=abstract><li class=abstract>2. Storing  Java objects in a object-oriented database directly.</li></ul><p class=abstract>A complete program example will accompany both parts.'