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I have an ntp server that returns the time zone of my country. During the development of a java service and deployment on a Tomcat server, when processing a data type sea of time or date whose origin is an input parameter or by querying the database. I can't process the date correctly.
To solve this problem temporarily, I have had to set the time zone by code both for the registration to the database and the query to it or during the processing of a request. I was hoping that the ntp service configured on my server would solve this problem. The local I have no problem to process the data type date or timestamp.
When I get the timestamp value from the database, I use the "parsearATimeStampLoca" function to correctly process the value from the database if it doesn't return the value 5 hours early. This happens to me when running a jar or consuming with a client the rest service published on the server.
if (rs.next()) {
respuesta = new EntidadStorageOvh();
respuesta.setExpired_at(AyudaTimeStamp.parsearATimeStampLocal(
rs.getTimestamp(3))
);
Function parsearATimeStampLocal
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
sdf.setTimeZone(TimeZone.getTimeZone("America/Bogota"));
String fechaGeneracion = sdf.format(ts);
tsAux = Timestamp.valueOf(fechaGeneracion);
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I have a problem that I'm stuck at, I'm trying to create a countdown timer that update itself from firebase, the timer will be shown to all users whenever a user visit my app ( I am creating a school management application,I want the timer the countdown timer to look like this 12days: 32 min : 3second to exams and let it automatically refresh so that it get new content).
I think the easiest way to do this is to create a deadline date value and store that date value in a firebase databse. When the user opens the app, you fetch the deadline value from firebase and then start a count down timer in the local app.
To get the deadline value from firebase you can use this link.
To create a count down timer you can use this link.
What you can do instead of changing the timer from Firebase is to save a timestamp into Firebase (the date you are planning to countdown from) and then query it client side and do the calculations of the days from the client.
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Here is the situation.I have two data sources, a message queue and a MySQL table, which can be regarded as DataStream and DataSet respectively.I want to start a job based on DataStream to pull data from the message queue and perform some calculation. In the progress of calculation, a job based on DataSet(the MySQL table) is needed, whose OutputFormat should return the result to the DataStream job.
I'm stuck here and need some help.
You cannot mix the DataStream and DataSet APIs in the same job. But there are ways to access MySQL from a streaming job. You can:
query MySQL from a flatmap
use async i/o to do that more efficiently
stream in the data from mysql using something like debezium
Depending on how you want to connect the data from mysql to your other stream(s), you may want to use a CoFlatmapFunction, or a CoProcessFunction.
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I am developing an application using servlet and jdbc using mysql database.
Here I have to move one table data into other table in every month end(lets say 30th)
visitorlog
id name date
1 XYZ 02-10-2016
visitorloghistory
id name date
Here I have to move all data of visitorlog into visitorloghistory in each month end, and need to remove data from visitorlog.
I have no idea how to do this.
Thanks in advance.
This is called event scheduler or more specifically cron job. The following should help you to start:
https://www.sitepoint.com/how-to-create-mysql-events/
http://www.mysqltutorial.org/mysql-triggers/working-mysql-scheduled-event/
The event schedulers are set to perform specific tasks depending upon time. The following is a sample:
DELIMITER ;;
CREATE EVENT UpdateData ON SCHEDULE EVERY DAY STARTS '2016-10-10 00:00:00' -- This is scheduled to start from '2016-10-10' and updates data every day
DO BEGIN
UPDATE table1 SET Status = 1 WHERE Status = 0;
UPDATE table2 SET Status = 1 WHERE Status = 0;
END;;
DELIMITER ;
Your can check this out. Write a script which will run at particular time.
Cron job for a Java Program
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I am working on printing a file with scheduled date (selected a date from datepicker) in Java, but I don't have any idea about how to do it.
Use cron based tasks that will fire and do the work. For your case, you may use Quartz
It's depend on what actualy you do.
If you want to print many files in different time (printer queque in some oraginsation for example) you could follow next recomendation:
1) place all records about planned print in some storage (file, DB)
2) create one scheduler( #Scheduled in spring for example, or java sheduled executor) wich will processed queqe every minute(if minute is minmal interval of date that you could select).
(Be careful and select delay option instead of rate in your scheduler)
3) print only whose files that time to proceed.
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Has anyone ever seen circumstances where MySQL gets confused about which timezone applies to a java.util.Date object while storing the Date object to a table? I'm seeing a situation where MySQL will occasionally apply a Timezone with offset=0, and then other times MySQL will apply a Timezone with offset=-12. I've debugged the code in both circumstances, and the code reports a Timezone with offset=0 consistently. Any ideas about what might be going on, here? Thanks, in advance.
A Date object doesn't have a time zone. It just refers to an instant in time.
It's unclear where you're getting a time zone from at all, but if you're expecting a Date to have an associated time zone, you should rethink your design.