Inter-Application Communication on Windows

Dave dave at looktowindward.com
Fri Feb 15 05:41:52 CST 2008


Hi,

The problem with my Application is that whole Tables can be renamed  
or deleted. Just tried running two apps at the same time accessing  
one database and it instantly crashed and the database is in pieces!

All the Best
Dave

On 14 Feb 2008, at 13:30, viktoras didziulis wrote:

> Hi Dave,
>
> in one of my applications I use shell to communicate with sqlite  
> for data .import and revolution's sqlite to query and modify the  
> same database. It was never corrupted... Maybe just  
> because .importing and modification are sequential and do not  
> attempt to modify the same database in the same time.
>
> I am frequently using an instance of commandline sqlite  and an  
> instance of sqlitespy for some database tests - it possibly can  
> corrupt the database, but so far this has never happened.
>
> Accessing the same sqlite database should not make any big troubles  
> unless both sqlite instances modify the database simultaneously. In  
> this case you may try implementing some sort of locking mechanism.  
> But then the solution with file would be simpler.
>
> I did a test with a very very simple sqlite app - it did not  
> corrupt the database even if many instances of it were running...  
> So you can read, insert or delete a record in a table with one  
> instance and read it with another and vice versa... But I guess  
> there are scenarios when the database can get corrupt.
>
> The zipped folder with both the compiled app (for Windows) and the  
> source can be downloaded from:
> http://ekoinf.net/soft/SQLiteTest.zip
>
> Best wishes
> Viktoras
>
> Dave wrote:
>> Hi,
>>
>> Since they are two standalone applications they will have  
>> different engine's and different SQLite libraries, so I don't  
>> think you could access the same database with it getting  
>> corrupted. If you know a way do this this I'd be VERY interested.
>>
>> Thanks
>>
>> All the Best
>> Dave
>>
>>
>> On 13 Feb 2008, at 19:08, viktoras didziulis wrote:
>>
>>> What about the 2 applications connecting to the same sqlite  
>>> database - one updates the db, the other checks whether and how  
>>> it was updated?..
>>>
>>> Viktoras
>>>
>>> Richard Gaskin wrote:
>>>> Dave wrote:
>>>>> I have an application that periodically creates or updates an  
>>>>> SQLite  database (actually there are lots of databases  
>>>>> (separate SQLite  files), but only one is worked on at a time)  
>>>>> and then sends the  results to the server. This process can  
>>>>> take upwards of 15 minutes to  complete. In the meantime I want  
>>>>> to be able to still use the  application to do other things  
>>>>> (such as create playlists in iTunes).
>>>>
>>>> I'd use sockets, or polling for a file.  While polling a file's  
>>>> content can eat some cycles, polling for the existence of a file  
>>>> is pretty darn fast.  Given the scenario you describe, where  
>>>> you're not really expecting a result for several minutes, you  
>>>> could probably get away with polling for a file every few  
>>>> seconds.  Cheap, simple, reasonably efficient.
>>>>
>>>
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>>
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