SWT 小部件日期时间插入到 mariadb

Question

我需要帮助。我想在我的数据库中存储一个日期时间值，但它说 时间戳方法不适用于日期时间参数 ，可能指的是准备语句代码“.setTimestamp”。我使用 SWT Datetime 小部件来获取开始日期，但我似乎无法将其放入准备好的语句中。来自 SWT 小部件的日期时间值在给定的参数上传递。

下面是代码：

public void addLeave(String leaveType, DateTime start, DateTime end, int halfDay){
            try{
                Connection con = getConnection();

                String sql = "INSERT into leaves(user_id, leaves_type, leaves_halfDay,leaves_startDate, leaves_endDate) VALUES(?,?,?,?,?)";
                PreparedStatement addLeave = con.prepareStatement(sql);

                addLeave.setString(1, Pkey);
                addLeave.setString(2, leaveType);
                addLeave.setInt(3, halfDay);
                addLeave.setTimestamp(4, start);
                addLeave.setTimestamp(5, end);
                addLeave.execute();

            }catch(Exception e){
                e.printStackTrace();
            }
        }

Answer 1

您必须自己将 DateTime 转换为 Timestamp：

private Timestamp getTimestamp(DateTime dt)
{
    Calendar cal = Calendar.getInstance();
    cal.set(Calendar.YEAR,         dt.getYear());
    cal.set(Calendar.MONTH,        dt.getMonth());
    cal.set(Calendar.DAY_OF_MONTH, dt.getDay());
    cal.set(Calendar.HOUR_OF_DAY,  dt.getHours());
    cal.set(Calendar.MINUTE,       dt.getMinutes());
    cal.set(Calendar.SECOND,       dt.getSeconds());

    return new Timestamp(cal.getTimeInMillis());
}

然后这样称呼它：

addLeave.setTimestamp(4, getTimestamp(start));

Answer 2

让 MySQL 像您一样进行转换 INSERT:

CREATE TABLE `ts_dt_n` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `t2` timestamp(6) NOT NULL DEFAULT CURRENT_TIMESTAMP(6) ON UPDATE CURRENT_TIMESTAMP(6),
  `t3` datetime(1) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=latin1

INSERT into ts_dt_n (t2, t3) values (FROM_UNIXTIME(1477155329.123),
                                     FROM_UNIXTIME(1477155329.123));

SELECT t2, t3 FROM  ts_dt_n WHERE id = 5\G
*************************** 1. row ***************************
t2: 2016-10-22 09:55:29.123000
t3: 2016-10-22 09:55:29.1

如果您来自 Java 的毫秒计时器，请在转换和插入时除以 1000：

INSERT INTO ts_dt_n (t2, t3) values (FROM_UNIXTIME(1477155829739/1000),
                                     FROM_UNIXTIME(1477155829739/1000));

SELECT t2, t3 FROM  ts_dt_n WHERE id = 6\G
*************************** 1. row ***************************
t2: 2016-10-22 10:03:49.739000
t3: 2016-10-22 10:03:49.7

SWT 小部件日期时间插入到 mariadb

SWT widgets datetime inserting to mariadb

java

swt

datetime

prepared-statement

mariadb