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HIVE json格式数据的处理

时间:2017-06-08 13:16:48      阅读:344      评论:0      收藏:0      [点我收藏+]

标签:direction   apple   create   pat   bic   方法   ring   instant   from   

在hive 避免不了Jason格式的话,可以使用如下两个函数

 

HIVE直接读入json的函数有两个:

(1)get_json_object(string json_string, string path)

返回值: string  

说明:解析json的字符串json_string,返回path指定的内容。如果输入的json字符串无效,那么返回NULL。  

举例:  

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;  

结果:amy 

这个函数每次只能返回一个数据项。

(2)json_tuple(jsonStr, k1, k2, ...)

参数为一组键k1,k2……和JSON字符串,返回值的元组。该方法比 get_json_object 高效,因为可以在一次调用中输入多个键

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

处理数据样例:
{"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}
处理HIVE语句:
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格式数据的处理

标签:direction   apple   create   pat   bic   方法   ring   instant   from   

原文地址:http://www.cnblogs.com/xd502djj/p/6962040.html

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