Java 如何使用OpenJPA从DB2数据库中选择前10条记录？

我试图使用OpenJPA从DB2数据库中选择前10条记录。我正在尝试获取查询中指定的结果：

SELECT * FROM CACHE_REFRESH_TABLE FETCH FIRST 10 ROWS ONLY

为此，我在

persistence.xml

中启用了以下属性

<property name="openjpa.jdbc.DBDictionary" value="db2(SupportsSelectStartIndex=true,SupportsSelectEndIndex=true)"/>

下面是Java代码

public List<CacheHistoryOTO> fetchRefreshHistory(
                int someInput1, String someInput2) throws SomeException {
            LOGGER.info(EventMessages.METH_START, "fetchRefreshHistory");
            List<CacheHistoryOTO> cacheHistoryOTOList = null;
            try {
                EntityManager entityManager = entityManagerProvider
                        .getEntityManager();
                final Query query = entityManager
                        .createNamedQuery("topHistoryRecords");
                query.setMaxResults(someInput1);//Depending on parameter someInput1 number of records to be fetched will be provided.

                cacheHistoryOTOList = (List<CacheHistoryOTO>) query
                        .getResultList();
            } catch (Exception e) {
                LOGGER.error(EventMessages.ERROR, e);
                throw new SomeException(Constant.ERROR_PERSISTENCE, e);
            }
            LOGGER.info(EventMessages.METH_END, "fetchRefreshHistory");
            return cacheHistoryOTOList;
    }

有人能建议用正确的方法来做这件事吗

---

我已经看过了，但没有帮助。

对我来说似乎是一个方言问题<代码>前10名是我希望在SQL Server中看到的东西。您可以共享数据源设置吗？

public List<CacheHistoryOTO> fetchRefreshHistory(
                int someInput1, String someInput2) throws SomeException {
            LOGGER.info(EventMessages.METH_START, "fetchRefreshHistory");
            List<CacheHistoryOTO> cacheHistoryOTOList = null;
            try {
                EntityManager entityManager = entityManagerProvider
                        .getEntityManager();
                final Query query = entityManager
                        .createNamedQuery("topHistoryRecords");
                query.setMaxResults(someInput1);//Depending on parameter someInput1 number of records to be fetched will be provided.

                cacheHistoryOTOList = (List<CacheHistoryOTO>) query
                        .getResultList();
            } catch (Exception e) {
                LOGGER.error(EventMessages.ERROR, e);
                throw new SomeException(Constant.ERROR_PERSISTENCE, e);
            }
            LOGGER.info(EventMessages.METH_END, "fetchRefreshHistory");
            return cacheHistoryOTOList;
    }

@NamedQueries({
        @NamedQuery(name = "topHistoryRecords", query = "SELECT cacheRefreshHistoryOTO FROM CacheHistoryOTO cacheRefreshHistoryOTO ORDER BY cacheRefreshHistoryOTO.refreshTimeStamp DESC")
        })