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。