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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