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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:

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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:

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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:

 

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{

[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:

 

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{

[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:

 

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{

[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

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

B.取unitPrices中的price单价

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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;

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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:

 

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[{[ 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

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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]

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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服务器之家。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

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