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：
