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[英]How to update deeply nested JSON object based on filter criteria in Postgres?
[英]How to update value in nested json Postgres
我在“信息”列中存儲了以下 JSON
{
"customConfig": {
"isCustomGoods": 1
},
"new_addfields": {
"data": [
{
"val": {
"items": [
{
"Code": "calorie",
"Value": "365.76"
},
{
"Code": "protein",
"Value": "29.02"
},
{
"Code": "fat",
"Value": "23.55"
},
{
"Code": "carbohydrate",
"Value": "6.02"
},
{
"Code": "spirit",
"Value": "1.95"
}
],
"storageConditions": "",
"outQuantity": "100"
},
"parameterType": "Nutrition",
"name": "00000000-0000-0000-0000-000000000001",
"label": "1"
},
{
"name": "b4589168-5235-4ec5-bcc7-07d4431d14d6_Для ресторанов",
"val": "true"
}
]
}
}
我想更新嵌套 json 的值
{
"name": "b4589168-5235-4ec5-bcc7-07d4431d14d6_Для ресторанов",
"val": "true"
}
並將“val”設置為“Yes” str 所以結果應該是這樣的
{
"name": "b4589168-5235-4ec5-bcc7-07d4431d14d6_Для ресторанов",
"val": "Yes"
}
我怎樣才能做到這一點 ? 假設我需要在 json 中為數據庫中的許多記錄更新此值
我們可以使用 Postgres 9.5+ 提供的jsonb_set()
從文檔:
jsonb_set(target jsonb, path text[], new_value jsonb [, create_missing boolean])
查詢更新嵌套對象:
UPDATE temp t
SET info = jsonb_set(t.info,'{new_addfields,data,1,val}', jsonb '"Yes"')
where id = 1;
它也可以用於選擇查詢:
SELECT
jsonb_set(t.info,'{new_addfields,data,1,val}', jsonb '"Yes"')
FROM temp t
LIMIT 1;
考慮到您的表中有一個常量 JSON 結構和一個主鍵。 想法是獲取值為true
的元素val
的確切路徑(可以位於數組中的任何索引處),然后將其替換為所需的值。 所以你可以像下面這樣寫你的查詢:
with cte as (
select
id,
('{new_addfields,data,'||index-1||',val}')::text[] as json_path
from
test,
jsonb_array_elements(info->'new_addfields'->'data')
with ordinality arr(vals,index)
where
arr.vals->>'val' ilike 'true'
)
update test
set info = jsonb_set(info,cte.json_path,'"Yes"',false)
from cte
where test.id=cte.id;
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