Type of variable of JDBC Request in JMeter

Question

I have a problem with my JMeter code, particularly with type of variables that are returned by JDBC Request. This because then i have to make a json with this variables and therefore is most important the type of them otherwise my rest web service returns error. I made this code:

The problem is on global_state variable because jdbc request save it as a string but the value is a float in my rest service. What is the solution? I also tried to use Beanshell PreProcessor to convert it without any result. Thanks

Answer 1

I think that it resolved, or won't fail during the http request, with this code:

"grid_voltage":  "${grid_voltage_1}"