nulla.epistola at web.de
Sat Oct 18 12:27:37 CEST 2014
Am 14.10.2014 15:36, schrieb Chuck:
> I am building a simple podcast program where I download all the data from a feed with feedparser and store the data in sqlite3. I am spanking new to sqlite and database programming. Should I create the database in the __init__ method of my class, or is that a bad idea. I haven't done any designing that included databases.
When I first answered this question, I sent the answer erroneously to
the OP and not to the list. So here it is again.
On Tue, Oct 14, 2014 at 1:19 PM, Sibylle Koczian wrote:
> As I don't know anything at all about podcasts and feeds, I'll just
> answer your question about creating the database in the __init__
> method of your class:
> That would destroy the existing database and create a new one without
> any data. If you don't want to keep data from former runs of your
> application, this wouldn't be necessary, because you could just
> delete the data and keep the database. But most probably you want to
> keep your data and add to it. In this case, you certainly don't want
> to create a new database.
> The __init__ method of your class might be the right place to open
> the database, though.
> You know that the documentation for the sqlite3 module is part of the
> Python documentation? It contains links to the SQLite web page and to
> a website with beginner information about SQL itself. So that should
> help to get you started.
Am 15.10.2014 18:51, schrieb Chuck Johnson:
> I was thinking that I could fix that by using ' ' ' CREATE TABLE IF
> NOT EXISTS ' ' ' Should I make the sqlite3.connect() command a
> global variable? I am not sure about how to design this properly.
That should work. I wouldn't make the connection a global variable. Use
it as a parameter for every function that needs it. Roughly like this:
# other imports as needed
def one_of_my_functions(myconn, my_other_parameters):
mycurs = myconn.cursor()
# do things with mycurs and my_other_parameters
# more of the same ...
conn = sqlite3.connect('path/to/my/database')
# more of the same
if __name__ == "__main__":
Or, if your program gets bigger, you might start and stop a connection
inside a function instead of keeping one connection open for all of the
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