1.操作键值对

PostgreSQL 对 jsonb 类型的筛选查询可以使用 -> 或者 ->> 操作符。

• -> 操作符用于通过 JSON 对象中的键来获取对应的值。
• ->> 操作符可以将获取到的值提取出来转化为字符串类型。

例如，下面是一个包含 jsonb 类型字段的表：

CREATE TABLE test (id SERIAL PRIMARY KEY,data JSONB
);INSERT INTO test (data) VALUES ('{"name": "John", "age": 30, "city": "New York"}');
INSERT INTO test (data) VALUES ('{"name": "Jane", "age": 25, "city": "Los Angeles"}');

我们可以通过下面这中查询方式进行全库的全文检索查询

-- 获取所有数据
SELECT * FROM test;-- 根据 jsonb 字段中的键值进行查询
SELECT * FROM test WHERE data -> 'name' = '"John"';
-- 注意：键名需要用单引号括起来，并且值需要用双引号括起来。-- 使用 ->> 将键对应的值提取出来进行查询
SELECT * FROM test WHERE data ->> 'age' = '30';

上面这个提取出来的例子可能不明显

下面添加一个复杂的json例子

{"caseInfo": {"caseNo": "C20xxxxxxxxx8212566","reportNo": "P2xxxxxxxxxxxxxxxxx3004","applyTime": 17xxxxxxxxx5000,"companyId": 1xx00,"treatType": "1","createFrom": 1xxx1,"companyName": "中国xxxxxxxxxxx公司","processType": "2xx","accidentDate": 171xxxxxxxx1000,"accidentType": "xx1x","hospitalCode": "xxxxxxxxx35","hospitalName": "台xxxxxxxxxxxx院","hospitalLevel": "","medicalFinish": "","firstCompanyId": 0987654,"injuredFromArea": "ytgrefds","insuranceTypeId": "","firstCompanyName": "中xxxxxxxxxxxx限公司","hospitalAttribute": "","uploadUserOrgCode": "","totalSettlementAmount": 0},"patientInfo": {"name": "邱76y5t432","idCard": "33sacdvfgbdcs1232675","address": "asadfghfdsa村","birthday": sadcsxazxsc000,"cardType": "asdsad","idDueDay": 2asxcv bgdfsc000,"genderCode": "1"},"applyUserInfo": {"nationality": "CHN","applyUserName": "","applyUserIdCard": "","applyUserBirthday": "","applyUserCardType": "","applyUserIdDueDay": "","applyUserGenderCode": "","applyUserPatientRelation": ""}
}

这个时候提取的作用就显得明显了很多

--  ->> 提取测试sql,将applyUserInfo下的nationality提取出来，做一维sql标准查询
SELECT count(*)
FROM case_service.cs_case_model
WHERE (cs_case_model.case_model_detail -> 'applyUserInfo' ->> 'nationality') like '%C%';

结果：