Question

我有以下表格列值：

2013-06-28T13:00:00.000Z    Motion
2013-06-28T18:15:00.000Z    Static  (row2)
2013-07-03T13:57:22.000Z    Moving  (row3)
2013-07-03T13:59:00.000Z    Motion

我想检查日期29-06-2013T01:00:00Z和29-06-2013T05:00:00Z是否都是静态。同样，我想查看日期30-06-2013T01:00:00Z和30-06-2013T05:00:00Z。显然，如果我们考虑上面的表值，则这是正确的，因为两个日期都在第2行和第3行之间。

如何使用sqlite做到这一点？

我收到的日期为29-06-2013和30-06-2013。首先，我需要将这些日期的凌晨1点和5点设置为两个日期，然后检查它们是否都是静态。

我尝试了以下内容：

Calendar cal1 = Calendar.getInstance();
cal1.setTime(input1.parse(startDate.get(0))); //29-06-2013
cal1.add(Calendar.AM, 1); //Added 1am to date 29-06-2013
weekHours = cal1.getTime(); 

Cursor chkCur1 = dbAdapter.rawQuery("select movement from user where Date <= '"
    + input1.format(weekHours) + "' order by Date asc LIMIT 1", null);

chkCur1.moveToFirst();

if(!chkCur1.isAfterLast() && chkCur1.getString(0).equals("Static"))
{
cal1.add(Calendar.AM, 5); //Added 5am to date 29-06-2013
weekHours = cal1.getTime();
}

chkCur1 = dbAdapter.rawQuery("select movement from user where Date <= '"
    + input1.format(weekHours) + "' order by Date asc LIMIT 1", null);

chkCur1.moveToFirst();

if(!chkCur1.isAfterLast() && chkCur1.getString(0).equals("Static")){
cal1.add(Calendar.DATE, 1);
cal1.add(Calendar.AM, 1); //Added 1am to date 30-06-2013
weekHours = cal1.getTime();


}

chkCur1 = dbAdapter.rawQuery("select movement from user where Date <= '"
    + input1.format(weekHours) + "' order by Date asc LIMIT 1", null);

chkCur1.moveToFirst();

if(!chkCur1.isAfterLast() && chkCur1.getString(0).equals("Static")){
cal1.add(Calendar.AM, 5); //Added 5am to date 30-06-2013
weekHours = cal1.getTime();

}

chkCur1 = dbAdapter.rawQuery("select movement from user where Date <= '"
    + input1.format(weekHours) + "' order by Date asc LIMIT 1", null);

chkCur1.moveToFirst();

if(!chkCur1.isAfterLast() && chkCur1.getString(0).equals("Static")){
System.out.println("Both dates are in between")
}

我使用了4个SQL查询：

1）将时间1am设置为date1并检查其上一个是否为静态。

2）将时间5am设置为date1并检查其上一个是否为静态。

3）将时间1am设置为date2并检查其上一个是否为静态。

4）将时间5am设置为date2并检查其上一个是否为静态。

如果所有条件都满足，则两个日期（date1和date2）介于两者之间，即静态。

但这是sql查询的重复，从而减慢了进程。

Answer 1

您可以将所有四项检查放入子查询中：

SELECT (SELECT movement FROM user WHERE Date <= ? ORDER BY Date) = 'Static'
   AND (SELECT movement FROM user WHERE Date <= ? ORDER BY Date) = 'Static'
   AND (SELECT movement FROM user WHERE Date <= ? ORDER BY Date) = 'Static'
   AND (SELECT movement FROM user WHERE Date <= ? ORDER BY Date) = 'Static';

这将为您提供一个带有单个布尔列的结果记录。

如何检查某个日期时间是否在相邻的行日期之间？

1 个答案: