postgresql的jsonb數據查詢和修改
本文主要講的是如何隨心所欲的查詢和修改postgresql中jsonb格式的數據
一、查詢
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簡單查詢
# 存儲的是key-value格式的數據,通過指定的key獲取對應的值 # 使用->返回的結果是帶引號的 select '{"nickname": "goodspeed", "avatar": "avatar_url"}'::json->'nickname' as nickname; # 使用->>返回結果不帶引號 select '{"nickname": "goodspeed", "avatar": "avatar_url", "tags": ["python", "golang", "db"]}'::json->>'nickname' as nickname;
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複雜查詢
# {tags,0}代表查詢key=‘tag’,且value爲數組中數組的第一個元素 select '{"nickname": "gs", "avatar": "avatar_url", "tags": ["python", "golang", "db"]}'::json#>'{tags,0}' as tag; # {aa,b,0}代表查詢key=‘aa’,對應的value中,key=‘b’的value中,數組的第一個元素 select '{"nickname": "gs", "avatar": "avatar_url", "tags": ["python", "golang", "db"], "aa":{"b": [{"c": 1}]}}'::jsonb#>>'{aa,b,0}';
二、修改
- 修改
jsonb_set(原數據, 需要更改的位置, 替換的值,是否不存在時新增), select jsonb_set('[{"f1":1,"f2":null},2,null,3]', '{0,f1}','[2,3,4]', false);
參考鏈接:https://www.cnblogs.com/alianbog/p/5658156.html