Jmeter - Compare/assert multiple data: Data from JSON against data from DB - jmeter

Question

For the purpose of my task i need to compare Data from JSON against data from DB, but i have few doubts how to build the scenario. My scenario is like:
1 Perform DB query
Which returns dynamic set like:
url secret
https://test1.com/ 1234
https://test2.com/ 1234
https://test3.com/ 1234
Based on this dynamic set, i drive my Loop controller to loop. Here from every single call, different JSON is produced like:
[
{
"adminLink": "",
"BTCAmount": 0,
"lastName": "test",
"amount": 1,
"clientId": "e1d4ab18517711eaa84cfa163eb75a2c",
"foundingSourceName": "test",
"secretId": "2938663415",
"txId": "",
"mcTxId": "1079249234",
"paymentAddress": "",
"result": "transaction timed out",
"firstName": "test",
"phoneNumber": "",
"currency": "USD",
"refoundAmount": 0,
"approveTime": 1582543463,
"email": "",
"status": 1,
"timestamp": 1581938595
},
{
"adminLink": "",
"BTCAmount": 0,
"lastName": "test",
"amount": 550,
"clientId": "ffe22f34742311eab73f06ed6719cf46",
"foundingSourceName": "test",
"secretId": "3096308675",
"txId": "",
"mcTxId": "1101155492",
"paymentAddress": "",
"result": "transaction timed out",
"firstName": "test",
"phoneNumber": "",
"currency": "USD",
"refoundAmount": 0,
"approveTime": 1586355699,
"email": "",
"status": 1,
"timestamp": 1585750862
}
]
2 From this dynamic json, i can extract: mcTxId with:
3.
For every single mcTxId , i need to perform JDBC query using:
select *
FROM affiliate_transaction
WHERE affiliate_id = 1 and mctxid = '${mcTxId_1}'
Which result to:
I managed to solve up to Loop Controller, and extract every single mcTxId, but i am stuck to nested looping logic, and assert each data.
How can i compare/assert every single clientId & approveTime between API call(json) and DB query, where their data set is always dynamic?
Any help is highly appreciated.
Apologies for the long post

Answer 1

Change your query to select client_id
FROM affiliate_transaction
WHERE affiliate_id = 1 and mctxid = '${mcTxId_1}' and store it into a JMeter Variable like client_id_from_db
Use JSON Extractor to get the client ID from the API and store it into a JMeter Variable like client_id_from_api
Once done you should be able to compare 2 JMeter Variables using Response Assertion