对数组中嵌套对象的jsonb LIKE查询 [英] jsonb LIKE query on nested objects in an array

问题描述

我的JSON数据如下:

My JSON data looks like this:

[{
  "id": 1,
  "payload": {
    "location": "NY",
    "details": [{
            "name": "cafe",
            "cuisine": "mexican"
        },
        {
            "name": "foody",
            "cuisine": "italian"
        }
    ]
  }
}, {
  "id": 2,
  "payload": {
    "location": "NY",
    "details": [{
            "name": "mbar",
            "cuisine": "mexican"
        },
        {
            "name": "fdy",
            "cuisine": "italian"
        }
    ]
  }
}]

给定一个文本"foo"，我想返回所有具有该子字符串的元组.但是我不知道如何编写相同的查询.

given a text "foo" I want to return all the tuples that have this substring. But I cannot figure out how to write the query for the same.

我关注了此相关答案，但无法弄清楚LIKE的操作方法.
这就是我现在正在做的事情:

I followed this related answer but cannot figure out how to do LIKE.
This is what I have working right now:

SELECT r.res->>'name' AS feature_name, d.details::text
  FROM   restaurants r
    , LATERAL (SELECT ARRAY (
     SELECT * FROM json_populate_recordset(null::foo, r.res#>'{payload, 
       details}')
     )
   ) AS d(details)
 WHERE d.details @> '{cafe}';

我不想传递cafe的整个文本，而是传递ca并获得与该文本匹配的结果.

Instead of passing the whole text of cafe I want to pass ca and get the results that match that text.

推荐答案

您的解决方案可以进一步简化:

Your solution can be simplified some more:

SELECT r.res->>'name' AS feature_name, d.name AS detail_name
FROM   restaurants r
     , jsonb_populate_recordset(null::foo, r.res #> '{payload, details}') d
WHERE  d.name LIKE '%oh%';

或更简单，使用 jsonb_array_elements() ，因为在此示例中，您实际上根本不需要行类型(foo):

SELECT r.res->>'name' AS feature_name, d->>'name' AS detail_name
FROM   restaurants r
     , jsonb_array_elements(r.res #> '{payload, details}') d
WHERE  d->>'name' LIKE '%oh%';

dbfiddle 此处

但这完全是您要求的 不是 :

But that's not what you asked exactly:

我想返回所有具有该子字符串的元组.

I want to return all the tuples that have this substring.

您将返回所有JSON数组元素(每个基表行0-n)，其中一个特定键('{payload,details,*,name}')匹配(区分大小写).

You are returning all JSON array elements (0-n per base table row), where one particular key ('{payload,details,*,name}') matches (case-sensitively).

您的原始问题在此之上有一个嵌套的JSON数组.您已为该解决方案移除了外部阵列-我做了同样的事情.

And your original question had a nested JSON array on top of this. You removed the outer array for this solution - I did the same.

根据您的实际要求，新文本Postgres 10的搜索功能可能会有用.

Depending on your actual requirements the new text search capability of Postgres 10 might be useful.

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