If I Use Middleware at the Service Side, Will It Affect Database Audit?

No.

Middleware is a type of software deployed between applications and software including OSs, networks, and databases. Middleware provides an environment for application operation and development, helping users flexibly and efficiently develop and integrate complex application software.

Database audit is deployed in out-of-path mode. The database audit agent (installed on database or application nodes) obtains database access traffic, uploads the traffic to the audit system, receives commands issued by the audit system, and reports database status.

Using middleware on the service side does not affect the agent during SQL listening or auditing.

If database audit cannot obtain any data, troubleshoot the problem by referring to: