[英]Nested JSON query in postgres
I have some JSON along the following lines, the format of which cannot, unfortunately, be changed: 我在以下几行中有一些JSON,不幸的是,其格式无法更改:
{
"elements": {
"nodes": [
{
"data": {
"name": "Name here",
"color": "#FFFFFF",
"id": "n0"
}
}
]
}
}
This is stored in a postgres database and I'd like to pull out records by means of the id embedded in the JSON above. 这存储在一个postgres数据库中,我想通过上面JSON中嵌入的id提取记录。 So far I've tried stuff like this:
到目前为止,我已经尝试过这样的事情:
SELECT "data".* FROM "data" WHERE payload #>> '{elements,nodes,data,id}' = 'n0';
...without success; ...没有成功; although this query runs it returns nothing.
尽管此查询运行,但不返回任何内容。 Can anyone suggest how this might be done?
谁能建议这怎么做?
Create schema: 创建架构:
create table json (
id serial primary key,
data jsonb
);
insert into json (data) values (
'{ "elements": {
"nodes": [
{
"data": {
"name": "Name here",
"color": "#FFFFFF",
"id": "n0"
}
}
]
}
}
'::jsonb);
Query itself: 查询本身:
select * from json js,jsonb_array_elements(data->'elements'->'nodes') as node
where node->'data'->>'id' = 'n0';
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