如何获取PostgreSQL数据库中的JSON值

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:

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)) --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:

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'

补充:PostgreSql数据库sql语句取Json值

1:json字段实例:

{

“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字段实例:

{

“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:

{

“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

select (字段名>>‘quotePriceAttribute')::json->>‘currencyName' from 表名;

B.取unitPrices中的price单价

select 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;

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字段实例:

[{“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

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”

select 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。

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