* updateClause and isolationLevel hints
*/
protected String getForUpdateClause(JDBCFetchConfiguration fetch,
boolean isForUpdate, Select sel) {
if (fetch != null && fetch.getIsolation() != -1) {
throw new InvalidStateException(_loc.get(
"isolation-level-config-not-supported", getClass().getName()));
} else if (isForUpdate && !simulateLocking) {
assertSupport(supportsSelectForUpdate, "SupportsSelectForUpdate");
return forUpdateClause;
} else {