How to use Connections in REF

Hello ALL
Seems UiPath has many issue with global variable, its mentioned everywhere :smiley:
(when i try to use globalvairable.dbconnString it cant see it !

im trying to use connection in enterprise framework
image

Is this possible to use all over the process? to connect to DB
and can someone point how please

Thanks in advance

@Hazem_Saleh

Connect to Database can be sued and the output can be saved to a global variables

cheers