Comments on: OpenBaseMovil – portable J2ME database applications

By: wotcha

wotcha — Wed, 21 May 2008 18:59:42 +0000

That sounds good – I’ll try it out

By: Narciso Cerezo

Narciso Cerezo — Tue, 20 May 2008 20:57:25 +0000

Hi Paul,
The answer is yes, it is an on-device/on-board relational database engine for any CLDC 1.0 / MIDP 2.0 mobile device, that stores data over the RMS system.
And, yes, it works with Nokia S40 devices.
Though with this kind of phones the current version 3.0.1 has some limitations due to the device limits. Nokia S40 devices, like BlackBerry or Motorola impose a limit on the size of a single RecordStore. This size varies from 32Kb up to 512Kb, depending on the phone model.
The current version detects this situation and applies compression, but it still is limited.
The next version that we plan to release on June will override this limit so you can create tables as large as needed.

In any case, OpenBaseMovil-db is one (important) of the many things you can find in OpenBaseMovil. It is a development framework with many utilities for making your mobile development a lot easier.
Take a look at the Quick Start Guide and the PasswordKeeper sample application in the downloads section.

By: wotcha

wotcha — Tue, 20 May 2008 20:47:45 +0000

Sorry if this is a dumb question, but I’ve been looking for sometime for a way to get persistent storage from a database on a Nokia mobile phone. I’ve checked out DB4O and other dbs but none seem to work on MIDP/CLDC devices yet. So I appear to be stuck with RMS, which is not that great for accessing data.

I’ve stumbled across your site and am not clear whether your product provides an on-board database on a mobile phone or is it just linking to a database on a server? If it provides an on-board database sounds just like what I’ve been looking for – amazing. If that’s the case does it work on Nokia S40 devices?

Thanks

Paul

By: Narciso Cerezo

Narciso Cerezo — Fri, 21 Dec 2007 14:00:56 +0000

Hi Aruna,
Our openbasemovil-core library contains a mobile optimized port of jzlib (in turn a port of zlib to Java).
This means that you can compress and decompress streams, but not directly zip files.
That is, it is compression but not archiving. In *nix you use tar to pack multiple files in one and then you compress that file with gzip (or bzip2 or whatever). The zip format has both things integrated.
As you know, you have full support for zip files in Java SE, but not in Java ME.
You might find an open source zip implementation that can run on Java ME.

By: aruna

aruna — Thu, 20 Dec 2007 10:39:25 +0000

Hi,
I am trying develop application to download a zip file from our server and decompress it in a location on Pocket PC, PDA and mobiles. Is your tool supports directly to decompress or unzip the zip with j2me.

Thanks,
Aruna.G

By: Narciso Cerezo

Narciso Cerezo — Fri, 14 Dec 2007 22:25:30 +0000

Hi Nik,
Thanks for your interest.
I suggest that you subscribe to the RSS feed in order to be notified of the upcoming releases of these libraries.
We are working hard to release all of them, along with documentation (reference and quick start guides), examples, templates, and everything you need to build applications quickly.
Currently just core and script have been released, but we expect to release the rest during December 2007 and January 2008.
We will release them as soon as possible, and we will publish here when they are ready for download.
We expect also to release OpenMidsets during February 2008. OpenMidsets is an application built on top of OpenBaseMovil that acts as a host for pure script applications, like Nokia widsets but way more powerful, free and open source.

By: Nik

Nik — Fri, 14 Dec 2007 18:33:33 +0000

Hi.
Sorry i dont understand: where i can download OpenBaseMovil-ui, OpenBaseMovil-storage, OpenBaseMovil-db?
Thank you.