Eugene Abarquez

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since May 18, 2006

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Recent posts by Eugene Abarquez

There's suddenly a lot of interest for Scala

I think Twitter has a lot to do with it's popularity.

13 years ago

Scala

This guy can have whatever he can get

Originally posted by Chandra Bhatt:
What if this treats your <HEAD> as coconut? Beware balds!!!

Which goes without saying that the fears of some people are well-founded. Lol.

14 years ago

Meaningless Drivel

This guy can have whatever he can get

Quite common here in the Philippines actually. I think it's a delicacy somewhere in the north, much like lobsters. I haven't eaten one though.

Now you know which country to avoid. Haha.

14 years ago

Meaningless Drivel

Continuous server query in client using JQuery

Originally posted by Eric Pascarello:
I think setTimeout would be your friend. When the response comes back, you use setTimeout and make it do another call to the server.

I do not recommend using setInterval in this case.

Eric

Hi Eric,

Thanks for the reply.

As I understand it, window.setInterval() will make a call every x number of seconds, while window.setTimeout() will make a call only once, after x seconds. Basing from what I need, window.setInterval() seems to be the more obvious choice. I am interested to know why you are recommending the use of window.setTimeout() instead of window.setInterval(), and just call it every time the response comes back.

Thanks in advance,

Eugene

14 years ago

HTML Pages with CSS and JavaScript

Continuous server query in client using JQuery

Hi,

I just want to know if this is possible in JQuery. I have a graph (statistical) in my page, and this graph gets updated automatically by ajax depending if there are changes in the data model. Now to do this, I have to read some data from the server continuously, say every minute, and change my display accordingly. The data read from the server is basically a flag; if changes have been made to the data model, this means that I have to update my display.

Is this possible in JQuery? Is there a way to continuously read data from the server, and I can assign the number of seconds or minutes that will be executed? Some examples will be greatly appreciated.

Thanks in advance,

Eugene
[ November 28, 2008: Message edited by: Eugene Abarquez ]

14 years ago

HTML Pages with CSS and JavaScript

lucky number

Or 7.777777777

14 years ago

Meaningless Drivel

lucky number

Only 0-9?

14 years ago

Meaningless Drivel

lucky number

-7

14 years ago

Meaningless Drivel

How to automatically push data

Thanks Ulf for taking the time to answer this. I will seriously consider all of your inputs. Thanks again.

14 years ago

Java in General

Problem in Export to Excel using Jexcel api

14 years ago

Other Open Source Projects

How to automatically push data

Hi Ulf,

Thanks for the reply.

Originally posted by Ulf Dittmer:
What exactly do you mean by "report display in the front-end"?

It's just a graph (generated by jasper report) on a web page.

Originally posted by Ulf Dittmer:
The app/web server wouldn't have to poll the DB every time one of the clients asked for updates - it could itself check in with the DB periodically, and prefetch the required data if there was a change. Thus the DB load wouldn't rise if there were more and more clients.

What do you mean by the app/web server checking in with the DB periodically? Does this mean that I would have to create an object that continually queries the database for changes, say every minute? Wouldn't this affect performance, as a database query is done every minute?

Also, I am not sure how to go about the checking for updates in the database. Should I have a counter for the number of rows in the table and prefetch the data if the value of the counter changes? What if the user only updated a row? Does this mean that I would have to check every record against the old ones?

Originally posted by Ulf Dittmer:
Most Databases have a concept of triggers that can be fired automatically if certain events (like a table change) occurs, but I would shy away from using that to reach outside of the DB. That would be a twisted design.

Yes I am considering the use of triggers. I am interested to know though why you think this would be a twisted design.

Thanks,

Eugene

14 years ago

Java in General

How to automatically push data

Hi,

Just needs some technical advice or suggestion here. I am building an application with a functionality that automatically pushes data from the database to a report display in the front-end. That is, every time a certain database table has been changed, the data should be automatically pushed to the front-end display, which is basically some statistical graphs.

I don't know how to go about this, particularly with the part that automatically pushes the data. Should there be a listener of some sort that checks for a database update? The technologies to use are Spring MVC and Ibatis for the front-end and controller, Jasper Reports for the graphs and report displays, and Oracle 10g for the database.

Feel free to offer up some advice.

Thanks,

Eugene

14 years ago

Java in General

5 letter scrabble

runch

14 years ago

Meaningless Drivel

5 letter scrabble

munch

14 years ago

Meaningless Drivel

5 letter scrabble

punch

14 years ago

Meaningless Drivel