public static void Revoke()
{
CS505Project1.Services.StandardService dbServices = new StandardService();
//Mom tries to give <dad, purchases, select, without>
GrantAction grant = new GrantAction();
grant.grantor_name = "mom";
grant.grantee_name = "PhilCollins";
grant.table_name = "clients";
grant.operation = Operation_Type.SELECT;
grant.grant = false;
dbServices.Revoke(grant);
}