I looked at the sqlite.org docs, but I am new to this, so bear with me. (I have a tiny bit of experience with MySQL, and I think using it would be an overkill for what I am trying to do with my application.)
From what I understand I can initially create an SQLite db file locally on my MAC and add entrees to it using a Firefox extension. I could then store any number of tables and images (as binary). Once my site that uses this db is live, I could upload the db file to any web hosting service to any directory. In my site I could have a form that collects data and sends a request to write that data to the db file. Then, I could have an iOS app that connects to the db and reads the data. Did I get this right?
Would I be able to run a Python script that writes to SQLite? What questions should I ask a potential hosting service? (I want to leave MediaTemple, so I am looking around...)
I don't want to be limited to a Windows server, I am assuming SQLite would run on Unix? Or, does it depend on a hosting service? Thanks!
I could upload the db file to any web hosting service to any directory
Supposing that the service has the libraries installed to handle sqlite, and that sqlite is installed.
Would I be able to run a Python script that writes to SQLite
Yes, well, maybe. As of Python 2.5, Python includes sqlite support as part of it's standard library.
What questions should I ask a potential hosting service
Usually, in their technical specs they will list what databases/libraries/languages are supported. I have successfully ran Python sites w/ sqlite databases on Dreamhost.
SQLite would run on Unix
Most *nix flavors have pre-packaged sqlite installation binaries. The hosting provider should be able to tell you this as well.
Related
I am currently creating an application that will be using Python Flask for the back-end and API and PostgreSQL as the database to store my data in JSON format. My plan is to have a front-end in JS to interact with the API which will pull relevant information from my database.
How do I package the database into the program so that if a fresh copy is pulled from GitHub, a user would have everything needed to host and use the service? I am still a new developer and having difficulty taking my hobbyist code and presenting it in a clean, organized way.
Thank you for all help in advance.
Though your question leaves quite a few options open, here are two things you could do:
If you assume your users can install a PostgreSQL database themselves: you could dump the database which contains the minimum required to run your application (using pg_dump). When your application starts on your user's server, it should detect the database it's connecting to is empty, which should trigger an import of your data. The only thing your users should do is fill out their database connection details
If your users don't know anything about configuring servers: You could create a Docker image containing your Python code and PostgreSQL. This package will contain all dependencies of your application and runs anywhere. Admittedly, this is a bit more 'advanced' and could lead to other difficulties both on your side as well as on your users.
So I've been looking all over the internet and only found resources/tutorials on how to connect to a MySQL server but my question is, how do you host a MySQL server both on Windows & Linux?
I am not quite sure what you are asking but if the question is how to run a database for python independent of the OS, consider using sqlite.
From the link (emphasis mine)
SQLite is an embedded SQL database engine. Unlike most other SQL
databases, SQLite does not have a separate server process. SQLite
reads and writes directly to ordinary disk files. A complete SQL
database with multiple tables, indices, triggers, and views, is
contained in a single disk file. The database file format is
cross-platform - you can freely copy a database between 32-bit and
64-bit systems or between big-endian and little-endian architectures.
These features make SQLite a popular choice as an Application File
Format. Think of SQLite not as a replacement for Oracle but as a
replacement for fopen().
So it allows you to use a database from your python code without the hassle of running a server or setting something up locally.
Note that sqlite can also be stored in-memory if you want to avoid writing to disk.
Unless you have a very specific reason to start the server from Python, I.e. you want to be able to programmatically do stuff you wouldn't do from the command line, I think the best you could do is to install an instance of Mysql server in your local machine, run it and then, you'll be able to connect to it from Python.
Bear in mind that your local installation of Mysql will be running on localhost (127.0.0.1)
I have built an application in python that is hosted on heroku which basically uses a script written in Python to store some results into a database (it runs as a scheduled task on daily basis). I would have done this with ruby/rails to avoid this confusion, but the application partner did not support Ruby.
I would like to know if it will be possible to build the front-end with Ruby on Rails and use the same database.
My rails application will need to make use MVC and have its own tables on the database, but it will also use the database that python sends data to just to retrieve some data from there.
Can I create the Rails app and reference the details of the database that my python application uses?
How could I test this on my local machine?
What would be the best approach to this?
I don't see any problem in doing this, as far as rails manages the database structure and python script populates it with data.
My advice, but just to make it simpler, is to define the database schema through migrations in your rails app and build it like the python script doesn't exist.
Once you have completed it, simply start the python script so it can start populating the Database (could be necessary to rename some table in the python script, but no more than this).
If you want to test in your local machine you can one of this:
run the python script in your local machine
configure the database.ymlin your rails app to point to the remote DB (can be difficult if you don't have administration access to the host server, because of port farwarding etc)
The only thing you should keep in mind is about concurrent accesses.
Because you have 2 application that both read and write in your DB, would be better if the python script makes its job in a single and atomic transaction, to avoid your rails app finding the DB in an half-updated state.
You can see the database like a shared box, it doesn't matter how many applications use it.
I'm developing a GUI Mac OS X application using PyQt+Python which will be distributed through Mac App Store. (Sadly, I have no Objective-C skills for now.)
The app makes use of an sqlite database to save the user inputs, and read from the sqlite database at specific time later. Which means my app requires the sqlite database to be readable/writable.
Before submitting to Mac App Store, right now my app runs well on my MacBook Pro(which I am currently keeping on the same location as the rest of app file dependencies).
Since i know that Apple's sandbox won't allow app read/write data(in my case which means the sqlite database) arbitrary.
My question is:
Since I'm using PyQt & Python to develop the application, where and how can i copy/save the sqlite datebase by code while installing?
If i package my program to a "myapp.app" file(using py2app or cxFreeze utilities), should i put a initial sqlite database in the "Resources" folder of the app bundle? If so, how can i get the sandbox allowed location and copy the database form "Resources" folder to the sandbox allowed location for reading/writing in my python code?
I Search a lot on the web, since i am not a Objective-C developer, i am confused by all the examples which all written in Objective-C. Is this task could be done in Python without calling the API from Cocoa/Objective-C or something?
I'm pretty new to Mac OS X development, so my question maybe foolish, sorry for this.
Thank you.
I have fixed this problem by myself.
What i did was place an initial sqlite database in the Resource folder of my app bundle, then copy it by code to a predefined path which was:
os.path.expanduser("~/com.company.AppName/data/Documents/"),
then apple's sandbox will put it in the right folder.
The good news is my app Events got approved by Apple.
You may find it on Mac App Store with the name: Events
You use QSettings to manage cross-platform storage of settings for a host of scenarios, including user inputs. Would that help?
I have a written a very small web-based survey using cgi with python(This is my first web app. ).The questions are extracted from a MySQL database table and the results are supposed to be saved in the same database. I have created the database along with its table locally. My app works fine on my local computer(localhost). To create db,table and other transaction with the MySQL i had to do import MySQLdb in my code.
Now I want to upload everything on my personal hosting. As far as I know my hosting supports Python,CGI and has MySQL database. And I know that I have to change some parameters in the connection string in my code, so I can connect to the database, but I have two problems:
I remember that I installed MySQLdb as an extra to my Python, and in my code i am using it, how would I know that my hosting's python interpretor has this installed, or do I even need it, do I have to use another library?
How do I upload my database onto my hosting?
Thanks
If you have shell access, you can fire up the python interpreter by running python and type import MySQLdb at the >>> prompt. If you get no errors in return, then its installed.
Likewise, if you have shell access, this page will help you with importing and exporting using the mysql command. I found it by googleing "import export mysql".
You can write a simple script like
import MySQLdb and catch any errors
to see if the required package is
installed. If this fails you can ask
the hosting provider to install your
package, typically via a ticket
The hosting providers typically also provide URL's to connect to the MySQL tables they provision for you, and some tools like phpmyadmin to load database dumps into the hosted MySQL instance
To check if MySQLdb library is installed on your hosting, simply open a python shell and type: import MySQLdb. If everthing goes ok, you're readt to go. If you get: ImportError: No module named MySQLdb, that means the the library is not installed and you nedd to install it.
You need that library or some library that provides similar support, because Python does not support native access to MySQL databases.
To transfer you database to your hosting check mysqldump.