sql解析嵌套json+数组
Posted 甜_tian
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了sql解析嵌套json+数组相关的知识，希望对你有一定的参考价值。
sql解析json的几种情况汇总如下：
目录
基础信息：
表名：table
字段名：t_json
普通json
"name": "a",
"title":"hh"
sql:
select get_json_object(t_json, '$.name') as name
,get_json_object(t_json, '$.title') as title
from table;json嵌套数组，数组中包含json
people_list:[
"people_name": "b",
"people_age":18
,
"people_name": "b",
"people_age":18
]
sql:
select get_json_object(people, '$.people_name') AS people_name
,get_json_object(people, '$.people_age') AS people_age
from (
select get_json_object(t_json, '$.people_list') AS people_list
from table
)
LATERAL VIEW explode(split(regexp_replace(regexp_replace(people_list,'\\\\[|\\\\]',''),',',';'),';')) num AS people
;
//注释
//数组类型的数据，需要做一行转多行的操作，用到LATERAL VIEW
//先看最内层regexp_replace(people_list,'\\\\[|\\\\]','') 这步操作是把数组外面的[]去掉
//regexp_replace(regexp_replace(people_list,'\\\\[|\\\\]',''),',',';')
//这一步是把数组中每个json连接的地方，由 , 替换成 ;
//最后根据替换后的；去split每个元素json嵌套数组，数组中嵌套复杂json
"
":[
"id": 20,
"package_name":"1",
"package_info":
package_list:[
"aaa",
"bbb"
]
,
"id": 21,
"package_name":"2",
"package_info":
package_list:[
"ccc",
"ddd"
]
]
sql：
select id, package_name, packages
from table
LATERAL VIEW json_tuple(t_json,"people_package[*].id") num AS ids
LATERAL VIEW explode(split(regexp_replace(ids,'\\\\[|\\\\]',''),',')) num AS id
LATERAL VIEW json_tuple(t_json,"people_package[*].package_name") num AS package_names
LATERAL VIEW explode(split(regexp_replace(package_names,'\\\\[|\\\\]',''),',')) num AS package_name
LATERAL VIEW json_tuple(t_json,"people_package[*].package_info[*].package_list") num AS packages
LATERAL VIEW explode(split(regexp_replace(packages,'\\\\[|\\\\]',''),',')) num AS package
;
//注释
//id
//LATERAL VIEW json_tuple(t_json,"people_package[*].id") num AS ids
//把people_package数组下的id列表获取出来，ids就是所有id的汇总
//LATERAL VIEW explode(split(regexp_replace(ids,'\\\\[|\\\\]',''),',')) num AS id
//把ids两边的[]去掉，根据','去分割，利用LATERAL VIEW一行变为多行
//package_name 思路如上
//package 步骤一致，只是多取了一层以上是关于sql解析嵌套json+数组的主要内容，如果未能解决你的问题，请参考以下文章