Parameters params;
params.A = "something";
params.B = "something";

// params.C is an output parameter

// BPA is just a parameter mapping structure, similar to .sch file
DBView<Parameters> view (
    "{call stored_procedure_x (?, ?, ?)}",
    stored_procedure_bpa()
    );

// Create an iterator pointing to the view
DBView<Parameters>::sql_iterator sprocIter = view.begin();

// Copy params into the stored procedure iterator
*sprocIter = params;

// In DTL, incrementing an iterator executes stored procedure
++sprocIter;

// Now sprocIter->C will hold results from calling the stored procedure