Java multi-threads connect to TDengine database issue

Question

I use the code above to implement a concurrent query.

but in the taoslog.0 in TDengine database,I could see only two connections like below, why?

Answer 1

try with AtomicLong for startDate, endDate and cost_total and please feed back. tnx

Answer 2

because TDengine has a connection pool inside TDengine client.

hence the output you pasted here makes sense.

they use a common connection but will be splited into multi work in TDengine server side.