Here you replace the COBOL source in the TemperatureConverter.cbl file with COBOL source that accesses the SQL Server database.
$set sql(dbman=jdbc)      
  class-id com.microfocus.converter.TemperatureConverter public.
  01 text1 pic x(10). *> to force implements IObjectControl
  exec sql include sqlca end-exec.
  method-id toCelsius.
  procedure division using by value fahrenheit as float-short returning celsius as float-short.
  exec sql connect to pubs end-exec.
      exec sql
           select (:fahrenheit - 32) * 5 / 9 into :celsius
      end-exec.
      exec sql disconnect pubs end-exec.
      goback.
 end method.
 method-id toFahrenheit.
 procedure division using by value celsius as float-short returning fahrenheit as float-short.
      exec sql connect to pubs end-exec.             
      exec sql
           select (:celsius * 9 / 5) + 32 into :fahrenheit
      end-exec.
      exec sql disconnect pubs end-exec.
      goback
 end method.       
 end class.