/**
* INTERNAL: Execute the query. If there are cached results return those. This must override the
* super to support result caching.
*
* @param aSession - the session in which the receiver will be executed.
* @return An object or vector, the result of executing the query.
* @exception DatabaseException - an error has occurred on the database
*/
public Object execute(AbstractSession session, AbstractRecord row) throws DatabaseException {
if (shouldCacheQueryResults()) {
if (getContainerPolicy().overridesRead()) {
throw QueryException.cannotCacheCursorResultsOnQuery(this);
}
if (isPrepared()) { // only prepared queries can have cached results.
Object results = getQueryResults(session, row, true);
// Bug6138532 - if results are "cached no results", return null immediately
if (results == InvalidObject.instance) {
return null;
}
if (results != null) {
return results;
}
}
}
return super.execute(session, row);
}
/**
* INTERNAL: Execute the query. If there are cached results return those. This must override the
* super to support result caching.
*
* @param session - the session in which the receiver will be executed.
* @return An object or vector, the result of executing the query.
* @exception DatabaseException - an error has occurred on the database
*/
public Object execute(AbstractSession session, AbstractRecord row) throws DatabaseException {
if (shouldCacheQueryResults()) {
if (getContainerPolicy().overridesRead()) {
throw QueryException.cannotCacheCursorResultsOnQuery(this);
}
if (shouldConformResultsInUnitOfWork()) {
throw QueryException.cannotConformAndCacheQueryResults(this);
}
if (isPrepared()) { // only prepared queries can have cached results.
Object queryResults = getQueryResults(session, row, true);
if (queryResults != null) {
if (QueryMonitor.shouldMonitor()) {
QueryMonitor.incrementReadAllHits(this);
}
// bug6138532 - check for "cached no results" (InvalidObject singleton) in query
// results, and return an empty container instance as configured
if (queryResults == InvalidObject.instance) {
return getContainerPolicy().containerInstance(0);
}
Collection results = (Collection) queryResults;
if (session.isUnitOfWork()) {
ContainerPolicy policy = getContainerPolicy();
Object resultCollection = policy.containerInstance(results.size());
Object iterator = policy.iteratorFor(results);
while (policy.hasNext(iterator)) {
Object result =
((UnitOfWorkImpl) session)
.registerExistingObject(policy.next(iterator, session), this.descriptor);
policy.addInto(result, resultCollection, session);
}
return resultCollection;
}
return results;
}
}
}
if (QueryMonitor.shouldMonitor()) {
QueryMonitor.incrementReadAllMisses(this);
}
return super.execute(session, row);
}