ConnectionString.idleTimeout not working as intended

[a-vezzoli-02]

Describe the bug
The idleTimeout property of the ConnectionSettings does not change the actual idle time of the connection.

To Reproduce
Steps to reproduce the behavior:

1. Use a ConnectionSetting instance with a short idleTimeout;
2. Request a connection from RacoonDen and release it;
3. Wait for the defined `idleTimeout.

Expected behavior
The ping test while requesting the next connection, should be negative, but its positive (it depends on the configuration of the Database itself)

Screenshots
No.

Version

• MySQL: Any
• Racoon: Latest branch

Additional context
A series of queries should be used instead of the idleTimeout URL parameter: https://dba.stackexchange.com/a/174640