Hi all,
I am using sqlite3 in python, and I wonder if there is a way to know
if there are valid rows returned or not. For example I have a table
song with one entry in it. The ID of that entry is 1, so when I do;
>>> r = c.execute('select * from song where id = 1')
>>> for s in r:
... print s
...
(1, u'Spikedrivers Blues', u'Mississippi John Hurt')
That works. But when I can't restore the row by e.g. an ID that does
not exist, I cannot see any method in 'r' (which is a SQLite.Cursor)
that can tell me if I have rows. As explained in the help, r.rowcount
does not give a valid result because it can't determine how many rows
are restored in advance.
All I can think of is a 'crappy' construction where I use the iterator
to see if there was something in there, but surely, there must be a
better way to know?
>>> r = c.execute('select * from song where id = 2')
>>> notfound = True
>>> for s in r:
... notfound = False
... print s
>>> if notfound:
... print 'No rows'
I am pretty new with Python, maybe there are some properties of an
iterator / sqlite3 I am not aware of that can tell me how many rows
are there?
With regards,
- Jorgen
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