aspose file tools*
The moose likes JDBC and the fly likes save large amount of rows Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Databases » JDBC
Bookmark "save large amount of rows" Watch "save large amount of rows" New topic
Author

save large amount of rows

Doua Beri
Ranch Hand

Joined: Sep 24, 2009
Posts: 60
Hi. I am building an application where users have the posibility to export some information from a mysql table(information is return by a select command) into a file(probably a csv).
I read some tutorials I founded on the net , but there the saving part is done by mysql server and I'm not interested in this solution because the users are conected to a remote mysql server.

The problem I have is that I can save the select if returns a small amount of rows. but some queries returns 200k+ rows and I want to keep the memory as much free as I can.

Is there any trick or any way I can read information from a large table?

Thank you.
Karan Johar
Greenhorn

Joined: Oct 02, 2009
Posts: 25
you can first do a count query to find how many rows may be returned, then if the rows are many, you can fetch a few at a time like 10 k and save. this way you will never have lot of rows in memory.
Doua Beri
Ranch Hand

Joined: Sep 24, 2009
Posts: 60
so you're saying to put mysql return with a limit( for example 10k) and save them. after that i'll put to return another 10k and so on?

hmm.. with other words to split my large query result into small results.

Ok. I will try and see what happens.

Thanks
 
I agree. Here's the link: http://aspose.com/file-tools
 
subject: save large amount of rows