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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2020/08/18 03:00:28 UTC

[GitHub] [incubator-iotdb] ATM006 opened a new issue #1630: count(xxx)无法用代码获取数量

ATM006 opened a new issue #1630:
URL: https://github.com/apache/incubator-iotdb/issues/1630


   SELECT count(eid) FROM root.IoTDB
   ![image](https://user-images.githubusercontent.com/24607498/90465420-ec315000-e141-11ea-9538-c506a612f71b.png)
   


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[GitHub] [incubator-iotdb] qiaojialin commented on issue #1630: count(xxx)无法用代码获取数量

Posted by GitBox <gi...@apache.org>.
qiaojialin commented on issue #1630:
URL: https://github.com/apache/incubator-iotdb/issues/1630#issuecomment-676958556


   用 SessionDataSet 的 Iterator 遍历结果集，需要先调用 iterator 的 next 方法准备数据，才能通过 getXXX() 获取数据。即使只有一行也需要先调用 next
   
   ![image](https://user-images.githubusercontent.com/7240743/90714280-e7070900-e2d9-11ea-9183-12408ac1fd03.png)
   


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[GitHub] [incubator-iotdb] qiaojialin commented on issue #1630: count(xxx)无法用代码获取数量

Posted by GitBox <gi...@apache.org>.
qiaojialin commented on issue #1630:
URL: https://github.com/apache/incubator-iotdb/issues/1630#issuecomment-676953083


   用的0.10.0发布版吗？ count 结果应该是 long 类型的，可以试试 getLong。要是方便的话可以提供一个简单的复现代码


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[GitHub] [incubator-iotdb] ATM006 closed issue #1630: count(xxx)无法用代码获取数量

Posted by GitBox <gi...@apache.org>.
ATM006 closed issue #1630:
URL: https://github.com/apache/incubator-iotdb/issues/1630


   


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[GitHub] [incubator-iotdb] ATM006 commented on issue #1630: count(xxx)无法用代码获取数量

Posted by GitBox <gi...@apache.org>.
ATM006 commented on issue #1630:
URL: https://github.com/apache/incubator-iotdb/issues/1630#issuecomment-677476947


   非常感谢  问题解决啦~


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