Cherry-pick #16001 to 7.x: Reuse connections on sql module #16027
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Cherry-pick of PR #16001 to 7.x branch. Original message:
What does this PR do?
Reuse connections between fetches on SQL module.
Why is it important?
Keep a connection open with the database instead of opening and closing connections on each fetch. this is consistent with other specific SQL modules we have, and is usually also prefered by users.
Checklist
I have made corresponding changes to the documentationI have made corresponding change to the default configuration filesI have added tests that prove my fix is effective or that my feature worksHow to test this PR locally
Same instructions as in #13257, and then check in the database server that an only connection is created, and it is maintained along the lifetime of the module. This can be checked in MySQL with
SHOW PROCESSLIST
.