更新Postgresql中

Question

我有以下JSON字段：

{
    "Id": "64848e27-c25d-4f15-99db-b476d868b575",
    "Associations_": [
        "RatingBlockPinDatum"
    ],
    "RatingScenarioId": "00572f95-9b81-4f7e-a359-3df06b093d4d",
    "RatingBlockPinDatum": [
        {
            "Name": "mappedmean",
            "PinId": "I.Assessment",
            "Value": "24.388",
            "BlockId": "Score"
        },
        {
            "Name": "realmean",
            "PinId": "I.Assessment",
            "Value": "44.502",
            "BlockId": "Score"
        }]}

我想将值从24.388更新为嵌套数组中的新值＆＃34; RatingBlockPinDatum＆＃34;其中Name =＆＃34; mappedmean＆＃34;。

任何帮助将不胜感激。我已经尝试了这个但是无法使其适应工作：

[Update nested key with postgres json field in Rails

Answer 1

您可以先在RatingBlockPinDatum JSON数组中的每个元素获得一个结果（使用jsonb_array_length和generate_series），然后对Name键所具有的结果进行过滤价值“mappedmean”。然后你有需要更新的记录。更新本身可以使用jsonb_set：

完成

with cte as (
    select id, generate_series(0, jsonb_array_length(info->'RatingBlockPinDatum')-1) i
    from   mytable
)
update mytable
   set info = jsonb_set(mytable.info, 
                 array['RatingBlockPinDatum', cte.i::varchar, 'Value'], 
                 '"99.999"'::jsonb)
from   cte
where  mytable.info->'RatingBlockPinDatum'->cte.i->>'Name' = 'mappedmean'
and    cte.id = mytable.id;

将“99.999”替换为您要在Value属性中存储的任何值。

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