各位用户为了找寻关于如何获取PostgreSQL数据库中的JSON值的资料费劲了很多周折。这里教程网为您整理了关于如何获取PostgreSQL数据库中的JSON值的相关资料,仅供查阅,以下为您介绍关于如何获取PostgreSQL数据库中的JSON值的详细内容
在PostgreSQL数据库中有一列为JSON,要获取JSON中得数据可以用下面sql:
? 1 2 3 4 5 6 7 8 9select
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))
--转换成一个数组
from
wallet_details
where
id = @id
)::jsonb)
as
x(orderno text, amount
numeric
(16, 6), ordertime text, recordtype
varchar
(32));
如果你获取得数据是当前行,但是JSON中也要取出来几个值可以用下面的方式获取:
? 1 2 3 4 5 6select
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'
补充:PostgreSql数据库sql语句取Json值
1:json字段实例:
? 1 2 3 4 5
{
“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字段实例:
? 1 2 3 4 5
{
“boxNum”: “0”,
“orderNum”: “0”,
“commentNum”: “0”
}
A.取boxNum的值,不带双引号。
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字段实例:
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33
{
“unitPrices”: [{
“price”: 10.0,
“unitId”: “8”,
“unitName”: “500克”,
“unitAmount”: “0”,
“isPMDefault”:
true
,
“isHomeDefault”:
true
,
“originalPrice”: 10.0
}],
“productName”: “远洋 加拿大 螯龙虾 野生捕捞”,
“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”: “人民币”
}
}
A.取quotePriceAttribute中的currencyName币制名称
? 1select
(字段名>>‘quotePriceAttribute
')::json->>‘currencyName'
from
表名;
B.取unitPrices中的price单价
? 1select
jsonb_array_elements((字段名->>‘unitPrices
')::jsonb)->>‘price'
from
表名;
C.取skuPortRate中的dynamicProperties的name为死亡率的propertieValue里面的value;
? 1 2select
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字段实例:
? 1 2 3 4 5 6
[{“
name
”: “捕捞方式”, “showType”: 4, “propertiesId”: “9a14e435-9688-4e9b-b254-0e8e7cee5a65”,
“propertieValue”: {“value”: “野生捕捞”, “enValue”: “Wild”}},
{“
name
”: “加工方式”, “showType”: 4, “propertiesId”: “7dc101df-d262-4a75-bdca-9ef3155b7507”,
“propertieValue”: {“value”: “单冻”, “enValue”: “Individual Quick Freezing”}},
{“
name
”: “原产地”, “showType”: 4, “propertiesId”: “dc2b506e-6620-4e83-8ca1-a49fa5c5077a”,
“propertieValue”: {“value”: “爱尔兰”, “remark”: “”, “enValue”: “Ireland”}}]
–获取原产地
? 1 2 3 4 5 6select
(
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”: “原产地”}'
)->>‘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““双引号”
? 1select
replace
(
cast
(jsonb_array_elements(huren)
as
text), ‘"
','
')
from
XXX limit 1
以上为个人经验,希望能给大家一个参考,也希望大家多多支持。如有错误或未考虑完全的地方,望不吝赐教。
原文链接:https://www.cnblogs.com/ljknlb/p/11734145.html