json - 对未知键的 Postgres JSON 查询

Question

我有一个 jsonb 列，其中的结构始终保持不变，但 json 中的键可能会改变。例如，

{
   "key-12345": 
    {
       "values-12345": [
          {"type": 5200, 
           "source": "somesource", 
           "messageid": 707643203507, 
           "timestamp": "2018-07-26T21:25:42.612Z", 
           "destination": "somedestination", 
           "previouslyRouted": false
          }, 
          {"type": 5200, 
           "source": "anothersource", 
           "messageid": 707643203507, 
           "timestamp": "2018-07-26T21:26:01.542Z", 
           "destination": "anotherdestination", 
           "previouslyRouted": false
           }
         ]
       },

   "key-6789": 
    {
       "values-34512": [
          {"type": 5200, 
           "source": "yetantohersomesource", 
           "messageid": 707643203507, 
           "timestamp": "2018-07-26T21:25:42.612Z", 
           "destination": "yetanothersomedestination", 
           "previouslyRouted": false
          }, 
          {"type": 5200, 
           "source": "anothersource", 
           "messageid": 707643203507, 
           "timestamp": "2018-07-26T21:26:01.542Z", 
           "destination": "anotherdestination", 
           "previouslyRouted": false
           }
         ]
       }
}

我知道该文档的结构将是相同的，但键可以是任何东西。我可以自己拉出 key

select jsonb_object_keys(column) from table; 

很容易，但我不知道如何提取分配给该键的对象并进行处理。如何根据键的值而不是值从 jsonb 对象中进行选择。

select object from document where json_key = 'key-12345';

Answer 1

是这样的:

SELECT object->>'key-12345' FROM document;

还有一个 where 子句:

SELECT * FROM document WHERE object->>'key-12345' IS NOT NULL;