try pattern for database connection with the close method
Mark Lawrence
breamoreboy at yahoo.co.uk
Sun Feb 22 14:07:03 EST 2015
On 22/02/2015 18:41, Mario Figueiredo wrote:
> On Sat, 21 Feb 2015 12:22:58 +0000, Mark Lawrence
> <breamoreboy at yahoo.co.uk> wrote:
>
>>
>> Use your context manager at the outer level.
>>
>> import sqlite3 as lite
>>
>> try:
>> with lite.connect('data.db') as db:
>> try:
>> db.execute(sql, parms)
>> except lite.IntegrityError:
>> raise ValueError('invalid data')
>> except lite.DatabaseError:
>> raise OSError('database file corrupt or not found.')
>
> The sqlite context manager doesn't close a database connection on
> exit. It only ensures, commits and rollbacks are performed.
>
Where in the documentation does it state that? If it does, it certainly
breaks my expectations, as I understood the whole point of Python
context managers is to do the tidying up for you. Or have you misread
what it says here
https://docs.python.org/3/library/sqlite3.html#using-the-connection-as-a-context-manager
?
>>> import sqlite3
>>> with
sqlite3.connect(r'C:\Users\Mark\Documents\Cash\Data\cash.sqlite') as db:
... db.execute('select count(*) from accounts')
...
<sqlite3.Cursor object at 0x00000000032C70A0>
>>> db.close()
>>>
Looks like you're correct. Knock me down with a feather, Clevor Trevor.
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
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