freebase mql游标，带Java api

Question

我试图寻找我的问题的答案，但解决方案似乎已经过时了……

我想在带有Java api的MQL中使用游标，但我尝试了许多组合，但都不起作用。此外，我尝试使用在线查询编辑器，但几次猜测都不起作用。下面是我的代码：

String query = "[{\"id\":null," +
                "\"name\":null," +
                "\"type\":\"/music/artist\"," +
                "\"limit\":10"+
                "}]";
HttpTransport httpTransport = new NetHttpTransport();
HttpRequestFactory requestFactory = httpTransport.createRequestFactory();
GenericUrl url = new GenericUrl("https://www.googleapis.com/freebase/v1/mqlread");
url.put("query", query);
url.put("key", properties.get("API_KEY"));
url.put("cursor",true);   //tried ".put("cursor",true), ("cursor",null) neither worked
HttpRequest request = requestFactory.buildGetRequest(url);
HttpResponse httpResponse = interrupter.executeQuery(request);
....

并在这里使用在线查询编辑器：http://www.freebase.com/query我尝试了以下查询：{ "cursor":true，" query "：{ "type":"/music/artist"，“name”：“警察”，“专辑”：[]}}

{
  "cursor":null,
  "query": {
  "type":"/music/artist",
  "name":"The Police",
  "album":[]
   }
}

但两者都给了我这个错误：

"{“错误”：{ "domain"：“全局”，“原因”：“无效”，"message"：“键光标是保留字”}，"code"：400，"message"：“键光标是保留字”}“

任何建议都是非常感谢的！

Answer 1

尝试将光标设置为空字符串，如下所示：

String query = "[{\"id\":null," +
                "\"name\":null," +
                "\"type\":\"/music/artist\"," +
                "\"limit\":10"+
                "}]";
HttpTransport httpTransport = new NetHttpTransport();
HttpRequestFactory requestFactory = httpTransport.createRequestFactory();
GenericUrl url = new GenericUrl("https://www.googleapis.com/freebase/v1/mqlread");
url.put("query", query);
url.put("key", properties.get("API_KEY"));
url.put("cursor", "");
HttpRequest request = requestFactory.buildGetRequest(url);
HttpResponse httpResponse = interrupter.executeQuery(request);