The database records are read through the system time under the Android system, causing the problem of incomplete Reading Records!

demand

There are some records stored in the database , Time stamped . I need to read the data of the day ( according to Android Read the time of the plate )

So we have the following code ：

Calendar instance = Calendar.getInstance();
instance.set(Calendar.SECOND, 0);
instance.set(Calendar.HOUR, 0);
instance.set(Calendar.MINUTE, 0);
instance.set(Calendar.MILLISECOND, 0);
long startTime = instance.getTimeInMillis();

instance.set(Calendar.SECOND, 59);
instance.set(Calendar.HOUR, 23);
instance.set(Calendar.MINUTE, 59);
long endTime = instance.getTimeInMillis();
session.queryBuilder(XXX.class)
.//  Here are N Many other conditions 
.where(XXXDao.Properties.Time.between(startTime, endTime))
.list();

result ：
No problem running on my tablet , Running on most tablets is no problem .

Problem finding

There is a tablet in the test hand , One problem I found was , The record clearly shows the data of the day , But I just can't find it .

Problem solving process

First of all, I suspect that the database did not retrieve the data , So get rid of the other conditions , Start checking the database , It turns out that the data .

So the start judgment is that there is a problem with my start time and end time .

So the breakpoint is , Look at the data in the database , What is the difference between my start time and my end time .

Results found , The start time is greater than the timestamp of all data .

therefore , I guess there is a mistake in the above time calculation , Check the time setting code , Found out

instance.set(Calendar.HOUR, 0);

It's used here Calendar.HOUR, Suddenly think of , There seems to be another one Calendar.HOUR_OF_DAY.

So it was changed to Calendar.HOUR_OF_DAY.

The test again , And calculate the timestamp , Found it right , The records are also read out ~~