[ros-users] Storing many files in a database ROS style

[Billy Okal]

Yes I wanted a more ROS approach to the storage, I could of course just
convert them back to text files and store them, but I I was looking for
something smarter than that and I though bag files could do some magic here,
if not at least this should be ticketed or something like that( a way to
store msg data directly into mem and be able to load it and do stuff on it)

thanks

On Fri, Jun 11, 2010 at 5:23 PM, Jeremy Leibs <leibs at willowgarage.com>wrote:

> Billy,
>
> I'm sorry I'm not entirely sure what it is that you are looking for.  If
> you want things to be fast, it sounds like you can load all of these files
> as messages into memory and work with them there without too much trouble.
> 1000 files of 4000 floats is only about 30MB, even if you store them as
> doubles you should be fine.
>
> Are you just looking for a way to write the messages out to disk and load
> them in again at a later point?  It sounds like you already have a way of
> reading your text files and converting them to messages.  Is it that you
> haven't implemented a way of writing them back out to your text format, or
> are you wanting to use a different, ROS-native, format to store them?
>
> If you could elaborate a little bit on what it is that you are looking for
> a solution to I can maybe point you in the right direction.
>
> --Jeremy
>
>
> On Fri, Jun 11, 2010 at 1:38 PM, Billy Okal <b.okal at jacobs-university.de>wrote:
>
>> Dear Ros Users,
>>
>> I am writting a ros package to emulate a database in which I want to store
>> many(1000+) text files(each containing about 4000 float values). Originally
>> I though of using bag files to store this info but now it looks like thats
>> not what I want. Basically I want to store these files and be able to
>> perform Addition, Deletion, and Querying(compare one text file against all
>> the rest to infer some properties of grasps). Right now I have made Ros msg
>> representing the text files and can move them around ros, but the problem is
>> storing these messages in some lasting memory so that I just load the
>> database(which I can also make a ros message) in the beginning and to stuff
>> then write it back.
>>
>> Does anybody have experience in this or something related or just some
>> ideas I could use to go about this? Also I need to querying to be really
>> fast(the goal is real time control)
>>
>> --
>> Best Regards,
>>
>> Billy Okal
>>
>> sure vi is user friendly, its just particular about who to be friends with
>>
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>>
>
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-- 
Best Regards,

Billy Okal

sure vi is user friendly, its just particular about who to be friends with
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