/**
* PUBLIC: Use a ScrollableCursor as the result collection.
*
* @param policy the scrollable cursor policy allows for additional result set options. Example:
* <p>ScrollableCursorPolicy policy = new ScrollableCursorPolicy()
* <p>policy.setResultSetType(ScrollableCursorPolicy.TYPE_SCROLL_INSENSITIVE);
* <p>query.useScrollableCursor(policy);
* <p>
*/
public void useScrollableCursor(ScrollableCursorPolicy policy) {
policy.setQuery(this);
setContainerPolicy(policy);
}
public void test() {
ReadAllQuery query = new ReadAllQuery();
ScrollableCursor cursor = null;
try {
query.setReferenceClass(Employee.class);
if (TYPE_SCROLL_INSENSITIVE_isSupported && CONCUR_UPDATABLE_isSupported) {
query.useScrollableCursor(2);
} else {
ScrollableCursorPolicy policy = new ScrollableCursorPolicy();
if (!TYPE_SCROLL_INSENSITIVE_isSupported) {
policy.setResultSetType(ScrollableCursorPolicy.TYPE_SCROLL_SENSITIVE);
}
if (!CONCUR_UPDATABLE_isSupported) {
policy.setResultSetConcurrency(ScrollableCursorPolicy.CONCUR_READ_ONLY);
}
policy.setPageSize(2);
query.useScrollableCursor(policy);
}
//
if (configuration != null) {
ExpressionBuilder builder = new ExpressionBuilder();
Expression exp = builder.get("salary").greaterThan(50000);
query.setSelectionCriteria(exp);
query.conformResultsInUnitOfWork();
}
cursor = (ScrollableCursor) getSession().executeQuery(query);
try {
// test to see if we can iterate through a list and then iterate
// in reverse through the same list.
int totalItems = 0;
while (cursor.hasNext()) {
readWithNext.addElement(cursor.next());
totalItems++;
}
while (cursor.hasPrevious()) {
readWithPrevious.addElement(cursor.previous());
totalItems--;
}
cursorSuccess = (totalItems == 0);
int size = readWithPrevious.size();
for (int i = 0; i < readWithNext.size(); i++) {
cursorSuccess =
(cursorSuccess
&& (readWithNext.elementAt(i) == readWithPrevious.elementAt((size - 1) - i)));
}
} catch (org.eclipse.persistence.exceptions.QueryException ex) {
caughtException = ex;
}
} finally {
if (cursor != null) {
cursor.close();
}
}
}