I have the following setting:
a restricted system that contains SQLite database and is able to use python.
a usual PC-system.
My aim is to write an application (preferable JAVA) for the PC-system to connect to the SQLite databse on the remote System to read, alter, etc. tables. Unfortunaetly I'm not able to install a Webserver on the remote system because system restrictions deny this intention. So i have been asking myself if it is possible to connect to the database anyway?! I thought of something like a Python connection wrapper, that redirects all database calls. Hope someone can give me a hint for solving this problem.
SQLite is not "db server" but "db file". You can't connect remotly to it because it is not server (you had to write own server). You can copy file with data to another computer and use it but you get two seperated databases. If you can share (in network) folder with that file you can use it on all computers - but there can be problem with concurent writing. SQLite is not designed to work with many users at the same time.
Related
I haven't been able to find any documentation regarding whether it's possible to access SQLITE3 (using Python) when the SQLITE database is hosted externally:
I have my SQLITE3 database hosted on my VPS (alongside some other stuff that doesn't really matter) - rather than having it as a local file with my Python program.
Therefore, is it possible for me to connect to the SQLITE database which is hosted on my VPS, or will the SQLITE DB have to be hosted locally for me to be able to do this?
The reason I want it to be accessible from my VPS is because I want to be able to run the program on multiple computers and them all have the same access to the database- if this isn't possible, are there any other options which would allow me to do this?
If you want to have a database server with external, possibly remote, applications interacting a client-server protocol switch to PostgreSQL, MariaDB, etc.
see: How to connect to SQLite3 database server?
I have created a webframework in Django which functions like an interactive dashboard. There is however the problem that the webframework contains data that I can't put in an online environment, but has to stay in a local SQL storage. The webframework has to run on three computers that do not have access the command prompt, therefore I can't run a local Django project on each of the computers
Is the following possible?
Host a Django website (just a shell) with user authentication and an online database that just manages the users.
Each computer has its own local SQL storage that Django is accessing i.e. SQLlite file that is present on the desktop. In other words the SQL db that I want Django to access is not present on the hosting machine but on that of the recipient.
In this case, the worst case scenario would be that someone breaks into the webframework but can not access the files since they are only available locally.
Am I overlooking anything or is this possible? I'm aware that this is very unusual and not very pratical, but it is the only think I can think of. If there is better alternative I would be open to suggestions.
Regards
im working on python application that requiring database connections..I had developed my application with sqlite3 but it start showing the error(the database is locked).. so I decided to use MySQL database instead.. and it is pretty good with no error..
the only one problem is that I need to ask every user using my application to install MySQL server on his pc (appserv for example) ..
so can I make mysql to be like sqlite3 apart of python lib. so I can produce a python script can be converted into exe file by the tool pyInstaller.exe and no need to install mysql server by users???
update:
after reviewing the code I found opened connection not closed correctly and work fine with sqllite3 ..thank you every body
It depends (more "depends" in the answer).
If you need to share the data between the users of your application - you need a mysql database server somewhere setup, your application would need to have an access to it. And, the performance can really depend on the network - depends on how heavily would the application use the database. The application itself would only need to know how to "speak" with the database server - python mysql driver, like MySQLdb or pymysql.
If you don't need to share the data between users - then sqlite may be an option. Or may be not - depends on what do you want to store there, what for and what do you need to do with the data.
So, more questions than answers, probably it was more suitable for a comment. At least, think about what I've said.
Also see:
https://stackoverflow.com/questions/1009438/which-database-should-i-use-for-my-desktop-application
Python Desktop Application Database
Python Framework for Desktop Database Application
Hope that helps.
If your application is a stand-alone system such that each user maintains their own private database then you have no alternative to install MySQL on each system that is running the application. You cannot bundle MySQL into your application such that it does not require a separate installation.
There is an embedded version of MySQL that you can build into your application (thanks, Carsten, in the comments, for pointing this out). More information is here: http://mysql-python.blogspot.com/. It may take some effort to get this working (on Windows you apparently need to build it from source code) and will take some more work to get it packaged up when you generate your executable, but this might be a MySQL solution for you.
I've just finished updating a web application using SQLite which had begun reporting Database is locked errors as the usage scaled up. By rewriting the database code with care I was able to produce a system that can handle moderate to heavy usage (in the context of a 15 person company) reliably still using SQLite -- you have to be careful to keep your connections around for the minimum time necessary and always call .close() on them. If your application is really single-user you should have no problem supporting it using SQLite -- and that's doubly true if it's single-threaded.
I am newbie to python and django, but this time I need a fast solution. I've got a problems, using hosting where my django application is deployed so I need to migrate to another server, but I have no ssh or telnet to server, only ftp connection for this server. I need to export data from django database. I wanted to write a script and put it somewhere in django application for data export, but when I put my modification on server behavior does not change(as nothing changed). Also when I remove .pyc files from djagno (for example. views.pyc) - no changes, and when I remove .py file - nothings changes (for example views.py).
As far as I read about django, it is possible that server is running with option "-noreload".
So question is it any possible way to dump database only via ftp and django/python?
(remote connection via mysql is disabled)
ftp stands for "file transfer protocol", not for "remote shell", so no, you cannot use ftp to execute a command / program / script / whatever. But why don't you just ask your hosting how to get a dump of your data ?
I'm pretty new to Python but have been running a few programs locally using Komodo edit, and then uploading the results manually to my website's MySQL database.
I'm looking into letting Python do this on it's own, but as i understand it i have to open my MySQL database to anyone regardless of if they are running scripts on my server or not if I'm to do this.
I'm guessing this is due to with security reasons, but i don't know how vulnerable this can make my site? Is it a bad idea to do it this way, or would it be better to run my python program from the server itself? (I've never run python code from my server, and my python code too, might be insecure)
If you have a access to the entire server (i.e. not just the hosting directory as is common on some shared hosting setups), and can ssh into the server, then your safest (though not easiest) option is to place the script on the server outside of the web hosting folder. This will stop anyone from remotely accessing the script, and will let you connect to the db without enabling remote connections.
You could enable remote connections if your hosting server set up allows it (not sure if any hosting companies disable, or prevent it, though you may have to enable it from the start when you create the database) Just select a nice strong password. Then you can use your script locally, and you'd be as secure as your password.