sql - 在 postgresql 中编辑 jsonb 数组的字段

Question

我在数据库中有以下 jsonb:

[
    {
        "state": 2,
        "activity": "EJECUCIÓN",
        "final_date": "2020-02-24",
        "activity_id": 1,
        "current_days": -7,
        "initial_date": "2020-02-24",

    },
    {
        "state": 2,
        "activity": "REVISIÓN",
        "final_date": "2020-02-25",
        "activity_id": 2,
        "current_days": 0,
        "initial_date": "2020-02-25",

    },
    {
        "state": 2,    
        "activity": "RECEPCIÓN",
        "final_date": "2020-02-27",
        "activity_id": 4,
        "current_days": 0,
        "initial_date": "2020-02-27"


    } ]

我运行以下查询来更新 current_days 字段:

WITH activity_state     as  ( SELECT taex_id,('{'||index-1||',current_days}')::text[] as pathe ,
        ((task_activity->>'final_date')::date - current_date) as current_days,
        task_activity->'state' as state,
        task_activity->>'final_date' as final_date,
        task_activity->>'current_days' as curren   FROM task_executions,jsonb_array_elements(taex_activitygraph) with ordinality arr(task_activity,index)   WHERE task_activity->>'state' = '2'  )  

update task_executions SET  taex_activitygraph = jsonb_set(taex_activitygraph,activity_state.pathe,to_jsonb(current_days),true) FROM activity_state  WHERE task_executions.taex_id = activity_state.taex_id  AND activity_state.state = '2'

但是该查询只更新我存在的 JSON 数组的第一个元素，其他元素不会发生变化，尽管在查询的第一部分。

( SELECT taex_id,('{'||index-1||',current_days}')::text[] as pathe ,
        ((task_activity->>'final_date')::date - current_date) as current_days,
        task_activity->'state' as state,
        task_activity->>'final_date' as final_date,
        task_activity->>'current_days' as curren   FROM task_executions,jsonb_array_elements(taex_activitygraph) with ordinality arr(task_activity,index)   WHERE task_activity->>'state' = '2'  )

它给我带来了应该更新的数组的所有元素，但第二部分是应该更新它们的地方:

update task_executions SET  taex_activitygraph = jsonb_set(taex_activitygraph,activity_state.pathe,to_jsonb(current_days),true) FROM activity_state  WHERE task_executions.taex_id = activity_state.taex_id  AND activity_state.state = '2'

只需更新我的第一项。

Answer 1

假设这个结构和数据:

postgres=# \d task_executions 
               Table "public.task_executions"
       Column       | Type  | Collation | Nullable | Default 
--------------------+-------+-----------+----------+---------
 task_activitygraph | jsonb |           |          | 

postgres=# SELECT jsonb_pretty(task_activitygraph) FROM task_executions ;
             jsonb_pretty             
--------------------------------------
 [                                   +
     {                               +
         "state": 2,                 +
         "activity": "EJECUCIÓN",    +
         "final_date": "2020-02-24", +
         "activity_id": 1,           +
         "current_days": -7,         +
         "initial_date": "2020-02-24"+
     },                              +
     {                               +
         "state": 2,                 +
         "activity": "REVISIÓN",     +
         "final_date": "2020-02-25", +
         "activity_id": 2,           +
         "current_days": 0,          +
         "initial_date": "2020-02-25"+
     }                               +
 ]
(1 row)

...此更新应该有效:

postgres=# UPDATE task_executions
SET task_activitygraph = (
  SELECT jsonb_agg(
    CASE WHEN elem->>'state' = '2'
    THEN 
      jsonb_set(
        elem,
        '{current_days}',
        to_jsonb((elem->>'final_date')::date - current_date)
      )
    ELSE
      elem
    END
  )
  FROM jsonb_array_elements(task_activitygraph) AS a(elem)
);
UPDATE 1

文档: https://www.postgresql.org/docs/9.5/functions-json.html

旁注:在事务数据库中(您有许多并发客户端，处理速度和存储效率很重要)，如果您的对象具有固定结构， 不要将您的数据存储为 JSON .改用关系数据模型。