如何从 jsonb_path_query 获取 Postgres 完整 JSON 路径

Question

我需要通过jsonb_set更新jsonb列，要使用jsonb_set，需要一个完整的Json路径。当 jsonb 有列表时，如何获得完整的 jsonb 路径？

例如，我得到了一个 JSON :

{
  "Laptop": {
    "brand": "Dell",
    "price": 1200,
    "specs": [
      {
        "name": "CPU",
        "Brand": "Intel"
      },
      {
        "name": "GPU",
        "Brand": "Nvdia"
      },
      {
        "name": "RAM",
        "Brand": "Kingston"
      }
    ]
  }
}

我需要一些类似的查询

SELECT <full_path> 
  FROM table 
 WHERE jsonb_path_query_first(col,"$.Laptop.specs[*].name")::text='"CPU"'`;

我需要一个与上面的查询匹配的完整路径 回报可能是

$.Laptop.specs[0].name

甚至更好

{Laptop,specs,0,name}

在Postgres中有什么方法可以实现这一点吗？

Answer 1

根据我的理解，你需要路径的索引？让我知道

WITH json_data AS (
    SELECT '{"Laptop": {"brand": "Dell", "price": 1200, "specs": [{"name": "CPU", "Brand": "Intel"}, {"name": "GPU", "Brand": "Nvdia"}, {"name": "RAM", "Brand": "Kingston"}]}}'::jsonb AS col
)
SELECT 
    CONCAT('$.Laptop.specs[', idx - 1, '].name') AS full_json_path
FROM 
    json_data,
    LATERAL jsonb_array_elements(col->'Laptop'->'specs') WITH ORDINALITY arr(elem, idx)
WHERE 
    elem->>'name' = 'CPU';

输出

$.Laptop.specs[0].name