HIVE json格式資料的處理

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在hive 避免不了Jason格式的話，可以使用如下兩個函數

 

HIVE直接讀入json的函數有兩個：

（1）get_json_object(string json_string, string path)

傳回值: string  

說明：解析json的字串json_string,返回path指定的內容。如果輸入的json字串無效，那麼返回NULL。  

舉例：  

hive> select  get_json_object(‘{“store”:{“fruit”:\[{"weight":8,"type":"apple"},{"weight":9,"type":"pear"}],  “bicycle”:{“price”:19.95,”color”:”red”}}, “email”:”amy@only_for_json_udf_test.net”,   “owner”:”amy” } ‘,’$.owner’) from dual;  

結果：amy 

這個函數每次只能返回一個資料項目。

（2）json_tuple(jsonStr, k1, k2, ...)

參數為一組鍵k1，k2……和JSON字串，傳回值的元組。該方法比 get_json_object 高效，因為可以在一次調用中輸入多個鍵

select a.timestamp, b.*from log a lateral view json_tuple(a.appevent, ‘eventid‘, ‘eventname‘) b as f1, f2;

處理資料範例：
{"GPS_LAT":39.8965125,"GPS_LONG":116.3493225,"GPS_SPEED":20.9993625,"GPS_STATE":"A","GPS_TIME":"2014-01-02 00:00:16","IMEI":"508597","after_oxygen_sensor":132,"air_condion_state":3,"bdoneNo_after_mileage":0,"bdoneNo_zero_mileage":8044,"db_speed":22,"direction_angle":358.2585,"front_oxygen_sensor":64,"instant_fuel":233,"speed":1210,"torque":33,"total_fuel":0}
處理HIVE語句：
create table 2014jrtest as select json_tuple(line,‘GPS_LAT‘,‘GPS_LONG‘,‘GPS_SPEED‘,‘GPS_STATE‘,‘GPS_TIME‘,‘IMEI‘,‘after_oxygen_sensor‘,‘air_condion_state‘,‘bdoneNo_after_mileage‘,‘bdoneNo_zero_mileage‘,‘db_speed‘,‘direction_angle‘,‘front_oxygen_sensor‘,‘instant_fuel‘,‘speed‘,‘torque‘,‘total_fuel‘) from 2014test;

HIVE json格式資料的處理