236 Glossary instance that has been made persistent
Glossary 237 SQL-92 Structured Query Language (1992 standard) stateful (session bean) A stateful component is dedicated to a single client for the duration of the client s reference to that component; it can usefully maintain client-specific state across method invocations stateless (session bean) A stateless component is dedicated to a single client only for the duration of an individual method invocation by that client on the component; it cannot meaningfully maintain client-specific state across method invocations transient 1. A keyword in Java that specifies attributes as being non-serialized 2. An object that does not represent persistent data transient (JDO state) The state that applies to any JDO instance that does not represent a data store entity, as is typical of instances newly instantiated with the new keyword Transient-Clean (JDO state) The state that applies to any JDO instance that is transactional, but which has not been changed in the current transaction Transient-Dirty (JDO state) The state that applies to any JDO instance that is transactional, and has been changed in the current transaction transparent persistence Everything that JDO undertakes in order to abstract applications from the underlying complexity of object persistence, specifically: 1. persistence by reachability 2. automatic change tracking of JDO instances 3. automatic mapping of Java data types to the native data types of the underlying data store 4. automatic mapping of persistence-capable classes to data structures in the underlying data store 5. automatic mapping of relationships between persistent instances: references, collections and, if supported, arrays 6. automatic support for inheritance hierarchies of persistence-capable classes and, if supported, interface implementation hierarchies as well 7. automatic translation of JDOQL syntax to the native query language of the underlying data store if appropriate UML Unified Modeling Language a set of standard notations by which software systems, and elements thereof, can be diagrammed uniquing The process by which a JDO implementation ensures that there is at most one JDO instance with a given JDO identity (Object ID) in the persistence manager s cache at one time URL Universal resource locator valid (XML) Some XML documents are constrained by a Document Type
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