code: private void addParameterInternal(String name, ParameterSetter parameterSetter) {
          if (!this.getParamNameToIdxMap().containsKey(name)) {
              throw new Sql2oException("Failed to add parameter with name '" + name + "'. No parameter with that name is declared in the sql.");
          }
          parameters.put(name, parameterSetter);
      }
docs: ------------------------------------------------