Hey,
You need JDBC driver to connect to DB, not to Confluence, so if your Jira is connecting to MySQL, then you would need the driver to connect to it. Connection to Confluence is done via application link, and there is no Jira connection to Confluence DB instance required for that.
Hope this is what you were looking for
Regards,
Igor
Additionally, here is the link to MySQL Configuration for Jira
https://confluence.atlassian.com/adminjiraserver071/connecting-jira-applications-to-mysql-802592179.html
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