在PostgreSQL數(shù)據(jù)庫中有一列為JSON,要獲取JSON中得數(shù)據(jù)可以用下面sql：
select orderno as OrderNo
,amount as Amount
,ordertime as OrderTime
, recordtype as RecordType
from jsonb_to_recordset(( --特定方法
select array_to_json(array_agg(data)) --轉(zhuǎn)換成一個數(shù)組
from wallet_details
where id = @id
)::jsonb) as x(orderno text, amount numeric(16, 6), ordertime text, recordtype varchar(32));
如果你獲取得數(shù)據(jù)是當(dāng)前行，但是JSON中也要取出來幾個值可以用下面的方式獲?。?/p>
select pay_params::json->>'Key' as Md5Key ,
pay_params::json->>'AppId' as Appid ,
pay_params::json->>'MchId' as Mchid ,
pay_params::json->>'SubMchId' as Submchid ,
tenant_id as Tenant_Id
from spm_wallet_settings where id='12'
補充：PostgreSql數(shù)據(jù)庫sql語句取Json值
1：json字段實例：
{
“boxNum”: 0,
“orderNum”: 0,
“commentNum”: 0
}
A.取boxNum的值
1.1)select 字段名->‘boxNum' from 表名;
1.2)select jsonb_extract_path_text字段名, ‘boxNum') from 表名;
2：json字段實例：
{
“boxNum”: “0”,
“orderNum”: “0”,
“commentNum”: “0”
}
A.取boxNum的值,不帶雙引號。
2.1)select 字段名->>‘boxNum' from 表名;
2.2)select jsonb_extract_path_text字段名, ‘boxNum') from 表名;
3：json字段實例：
{
“unitPrices”: [{
“price”: 10.0,
“unitId”: “8”,
“unitName”: “500克”,
“unitAmount”: “0”,
“isPMDefault”: true,
“isHomeDefault”: true,
“originalPrice”: 10.0
}],
“productName”: “遠洋 加拿大 螯龍蝦 野生捕撈”,
“productType”: 1,
“skuPortRate”: {
“id”: “a6b83048-3878-4698-88c2-2a9de288ac56”,
“cityId”: “2bf8c60c-789d-433a-91ae-8e4ae3e587a4”,
“dynamicProperties”: [{
“name”: “死亡率”,
“propertiesId”: “f05bda8c-f27c-4cc6-b97e-d4bd07272c81”,
“propertieValue”: {
“value”: “2.0”
}
}, {
“name”: “失水率”,
“propertiesId”: “ee9d95d7-7e28-4d54-b572-48ae64146c46”,
“propertieValue”: {
“value”: “3.0”
}
}]
},
“quotePriceAttribute”: {
“currencyName”: “人民幣”
}
}
A.取quotePriceAttribute中的currencyName幣制名稱
select (字段名>>‘quotePriceAttribute')::json->>‘currencyName' from 表名；
B.取unitPrices中的price單價
select jsonb_array_elements((字段名->>‘unitPrices')::jsonb)->>‘price' from 表名；
C.取skuPortRate中的dynamicProperties的name為死亡率的propertieValue里面的value；
select bb->‘propertieValue'->>‘value' as value from (
select jsonb_array_elements(((字段名->>‘skuPortRate')::json->>‘dynamicProperties')::jsonb) as bb from 表名) as dd where dd.bb @> ‘{“name”: “死亡率”}';
4.json字段實例：
[{“name”: “捕撈方式”, “showType”: 4, “propertiesId”: “9a14e435-9688-4e9b-b254-0e8e7cee5a65”,
“propertieValue”: {“value”: “野生捕撈”, “enValue”: “Wild”}},
{“name”: “加工方式”, “showType”: 4, “propertiesId”: “7dc101df-d262-4a75-bdca-9ef3155b7507”,
“propertieValue”: {“value”: “單凍”, “enValue”: “Individual Quick Freezing”}},
{“name”: “原產(chǎn)地”, “showType”: 4, “propertiesId”: “dc2b506e-6620-4e83-8ca1-a49fa5c5077a”,
“propertieValue”: {“value”: “愛爾蘭”, “remark”: “”, “enValue”: “Ireland”}}]
–獲取原產(chǎn)地
select
(SELECT ss->‘propertieValue' as mm FROM
(SELECT jsonb_array_elements (dynamic_properties) AS ss FROM product
where id=a.id) as dd where dd.ss @> ‘{“name”: “原產(chǎn)地”}')->>‘value' as cuntry,
a.*
from product as a where a.id=‘633dd80f-7250-465f-8982-7a7f01aaeeec'；
5：json例子:huren:[“aaa”,“bbb”,“ccc”…]
需求：取值aaa去““雙引號”
select replace(cast(jsonb_array_elements(huren) as text), ‘"','') from XXX limit 1
以上為個人經(jīng)驗，希望能給大家一個參考，也希望大家多多支持腳本之家。如有錯誤或未考慮完全的地方，望不吝賜教。
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