Writing Gains via TpcDb Object in a RootMacro

void WriteGains(){

gSystem->Load("St_base"); // Root version of StDbLib depends on St_base
gSystem->Load("StDbLib.so"); 
gSystem->Load("StTpcDbUtil.so"); // Utilities depend on StDbLib
gSystem->Load("WriteGains.so"); // Write depends on StTpcDbUtil

// do the work
WriteGains writer;
writer.write();

}