Fast ResultSet into ADempiere CallOut

import java.math.BigDecimal;
import org.compiere.util.DB;
import org.compiere.util.Env;

String sql = "SELECT t.campo1, t.campo2 FROM Tabla t;";

rows = DB.getRowSet(sql);

// You can use "while" instruction when result are many rows
if(rows.next())
{
    A_Tab.setValue("Campo1", rows.getString(1));
    A_Tab.setValue("Campo2", rows.getInt(2));
    ...
};

return "";