如何使用Python或其他語言將數據從cassandra導出到Json文件？

Question

我想將數據從卡桑德拉導出到JSON文件，因爲Pentaho的不支持我的版本卡桑德拉3.10

Answer 1

你可以簡單地select後添加json得到JSON格式結果：

cqlsh:cycling> select json name, checkin_id, timestamp from checkin; 
[json] 
------------------------------------------------------------------------------------------------------------------ 
{"name": "BRAND", "checkin_id": "50554d6e-29bb-11e5-b345-feff8194dc9f", "timestamp": "2016-08-28 21:45:10.406Z"} 
    {"name": "VOSS", "checkin_id": "50554d6e-29bb-11e5-b345-feff819cdc9f", "timestamp": "2016-08-28 21:44:04.113Z"} 
(2 rows) 

取自https://docs.datastax.com/en/cql/3.3/cql/cql_using/useQueryJSON.html