Question

我正在尝试从我的java应用程序运行一个简单的查询：

SELECT * FROM Schedule where date > DATETIME(2013,11,10)

如果获得以下错误JSON响应：

03-06 14:03:13.730: W/System.err(13272): com.google.api.client.googleapis.json.GoogleJsonResponseException: 503 Service Unavailable
03-06 14:03:13.730: W/System.err(13272): {
03-06 14:03:13.730: W/System.err(13272):   "code" : 503,
03-06 14:03:13.730: W/System.err(13272):   "errors" : [ {
03-06 14:03:13.730: W/System.err(13272):     "domain" : "global",
03-06 14:03:13.730: W/System.err(13272):     "message" : "javax.persistence.PersistenceException: Problem with query <SELECT FROM Schedule as Schedule WHERE date > DATETIME(2013,11,10)>: Unsupported method <DATETIME> while parsing expression: InvokeExpression{STATIC.DATETIME(Literal{2013}, Literal{11}, Literal{10})}",
03-06 14:03:13.730: W/System.err(13272):     "reason" : "backendError"
03-06 14:03:13.730: W/System.err(13272):   } ],
03-06 14:03:13.730: W/System.err(13272):   "message" : "javax.persistence.PersistenceException: Problem with query <SELECT FROM Schedule as Schedule WHERE date > DATETIME(2013,11,10)>: Unsupported method <DATETIME> while parsing expression: InvokeExpression{STATIC.DATETIME(Literal{2013}, Literal{11}, Literal{10})}"
03-06 14:03:13.730: W/System.err(13272): }

当我从app引擎网站上的管理控制台运行它时，这个确切的查询工作得很好 'date'是一个DateTime字段，我有一个索引。在应用程序引擎网站上，该字段如下所示：“2014-04-13 00:00:00”

这是我的代码：

    EntityManager mgr = null;
    Cursor cursor = null;
    List<Schedule> execute = null;

    try {
        mgr = getEntityManager();
        Query query = mgr.createQuery("select from Schedule as Schedule "
                                    + "where date > DATETIME(2013,11,10)");
        if (cursorString != null && cursorString != "") {
            cursor = Cursor.fromWebSafeString(cursorString);
            query.setHint(JPACursorHelper.CURSOR_HINT, cursor);
        }

        if (limit != null) {
            query.setFirstResult(0);
            query.setMaxResults(limit);
        }

        execute = (List<Schedule>) query.getResultList();
        cursor = JPACursorHelper.getCursor(execute);
        if (cursor != null)
            cursorString = cursor.toWebSafeString();

        // Tight loop for fetching all entities from datastore and accomodate
        // for lazy fetch.
        for (Schedule obj : execute)
            ;
    } finally {
        mgr.close();
    }

    return CollectionResponse.<Schedule> builder().setItems(execute)
            .setNextPageToken(cursorString).build();

任何帮助我都非常感激

在google-app-engine中：如何在GQL中的特定日期之后查询所有条目

0 个答案: