不同格式要求的日期的歌是化要求，可以放到bean里面做

根据对于日期的不同格式的要求，把从数据库中取出的日期型变量进行处理，输出的时候，输出的变量就已经是个是画成要求的形式了。

一共三种形式：

            switch (dbVendor) {
                case 1:
                    returnDate = "to_date('" +
                        bvDate.format("strftime:%m/%d/%Y" +
                                      (ignoreTime ? "" : " %H:%M:%S"))
                        + "', 'mm/dd/yyyy" + (ignoreTime ? "" : " hh24:mi:ss") +
                        "')";
                    break;
                case 2:
                    returnDate = "'" +
                        bvDate.format("strftime:%Y-%m-%d" +
                                      (ignoreTime ? "" : " %H:%M:%S"))
                        + (ignoreTime ? " 00:00:00" : "") + "'";
                    break;
                case 3:
                    returnDate = "convert(datetime,'" +
                        bvDate.format("strftime:%Y/%m/%d" +
                                      (ignoreTime ? "" : " %H:%M:%S"))
                        + (ignoreTime ? " 00:00:00" : "") + "')";
                    break;
            }