All you need to do is set up a connection to the database in application.properties and add your queries to the query.json file.
Then you need to send a POST Request to localhost:8080/get with your query name, and parameters if your query need it.
An example of a POST query sent
Select * from COMPANY where companyProfit >= :companyProfit
H2 Databese and Liquiscript are used only for testing