HIVE直接读入json

• get_json_object(jsonStr, kn)

        返回值: 一个key对应的一个字段

        说明：解析json的字符串jsonStr,若输入的json字符串无效，则返回NULL。

        样例：表test,字段json_str存储了json字符串

{ "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" }
{ "firstName": "jesse", "lastName":"AJ", "email": "bb" }

Hive处理语句：select get_json_object(json_str,'$.firstName') from origin_lefuwx.test t

• json_tuple(jsonStr, k1, k2, ...)

        返回值：多个key对应的多个字段

        说明：比 get_json_object 高效，可以在一次调用中输入多个键

        样例：表test,字段json_str存储了json字符串

{ "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" }
{ "firstName": "jesse", "lastName":"AJ", "email": "bb" }

HIVE处理语句：select json_tuple(json_str,'firstName','lastName','email') from origin_lefuwx.test t

HIVE直接读入url

• parse_url(url, partToExtract[, key])

        partToExtract的选项包含[HOST,PATH,QUERY,REF,PROTOCOL,FILE,AUTHORITY,USERINFO]

样例：

http://192.168.111.23:8888/filebrowser/view=/DB/lefuwx/test/part-m-00000

Hive处理语句：select parse_url('http://192.168.111.23:8888/filebrowser/view=/DB/lefuwx/test/part-m-00000','HOST')

• parse_url_tuple(url, k1,k2..)

        partToExtract的选项包含[HOST,PATH,QUERY,REF,PROTOCOL,FILE,AUTHORITY,USERINFO]

样例：

http://192.168.111.23:8888/filebrowser/view=/DB/lefuwx/test/part-m-00000

Hive处理语句：select parse_url_tuple('http://192.168.111.23:8888/filebrowser/view=/DB/lefuwx/test/part-m-00000','HOST','PATH')