在Postgres中从jsonb中通过未知键获取元素

Question

我有以下数据结构：

{
    "proccess1": {
        "error": "error1 description",
        "nextRetryAt": "2018-02-22T07:39:00.325Z",
        "attemptsMade": 148,
        "firstFailedAt": "2018-02-16T06:40:41.327Z"
    },
    "proccess2": {
        "error": "error2 description",
        "nextRetryAt": "2019-03-16T06:41:01.566Z",
        "attemptsMade": 77,
        "firstFailedAt": "2016-03-15T04:35:12.248Z"
    }
}

我的问题是如何构建像下面这样的查询：

select * 
from data 
where data->[0]->>'nextRetryAt' = 'my passed value'

我不知道 proccess1 和 proccess2 这两个键的具体名称。它们可能有任何值。

- Daulet Nurgali

Answer 1

https://www.postgresql.org/docs/current/static/functions-json.html

jsonb_object_keys函数可以为您提供帮助。

https://www.db-fiddle.com/f/9fB1pfb3BWv4v2wBUwU1Bd/0

with c(j) as (values('{
    "proccess1": {
        "error": "error1 description",
        "nextRetryAt": "2018-02-22T07:39:00.325Z",
        "attemptsMade": 148,
        "firstFailedAt": "2018-02-16T06:40:41.327Z"
    },
    "proccess2": {
        "error": "error2 description",
        "nextRetryAt": "2019-03-16T06:41:01.566Z",
        "attemptsMade": 77,
        "firstFailedAt": "2016-03-15T04:35:12.248Z"
    }
}'::jsonb))
select j->jsonb_object_keys(j)->>'nextRetryAt' from c;

- Vao Tsun