  def self.get_for(user_id, date_s)

    SqlHelper.validate_token([user_id, date_s])
    begin
      con = "(user_id=#{user_id}) and (date='#{date_s}')"
      return Timecard.where(con).first
    rescue
    end
    return nil
  end
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.