Question

I am writing a program on python which interacts with MySQL database.
For sql queries I use MySQLdb.
The problem is that fetchone() returns None but with the database browser I can see that that row exists.
This piece of code:

query = "SELECT * FROM revision WHERE rev_id=%s;" 
cursor.execute(query % revision_id)
row = cursor.fetchone()
if row == None:
    raise Exception("there isn't revision with id %s" % revision_id)

I have no idea what is going on here. Any ideas?

EDIT: okay, in some cases it works in some cases it doesn’t but anyway when it
does not work the row exists in the table. I am passing a cursor object to a function and the code above is in the function. The problem is connected with this cursor object. Could the problem be that I pass the cursor as an argument to the function? How can I test it?

EDIT2: yes, the problem is that cursor does not work after I use it several times. Wether because other program connects to the DB or I am doing something wrong.
I have while loop in which I call a function to get info from the DB. After some iterations it does not work again. There is another program which writes to
the DB while while loop works.

Answer 1

Okay, db.autocommit(True) solved my problem.