Executing Sql queries in camunda

hello All,
I have been trying to send POST queries to camunda, but CORS filter is not working even after setting it either globally in web.xml or to any specific web-app deploying in camunda.(war format).

So i decided to find a way to send SQL queries to database of camunda apache-tomcat-8 (7.5.0).
How do setup the environment so as to be able to send SQL queries to camunda server and execute them for CRUD operations.

Should i use Microsoft Sql server ,If yes how will i connect that to camunda SQL database.??

Any leads would be Highly Appreciated
Thanking in Advance
Shohil Sethia

See my answer here: How camunda stores its database?
Please do not post the same question multiple times in different flavors.