Iterating over PyoDBC result without fetchall()

问题

I'm trying to process a very large query with pyodbc and I need to iterate over the rows without loading them all at once with fetchall().

Is there a good and principled way to do this?

回答1:

Sure - use a while loop with fetchone.

http://code.google.com/p/pyodbc/wiki/Cursor#fetchone

row = cursor.fetchone()
while row is not None:
    # do something
    row = cursor.fetchone()

回答2:

you could also use cursor.fetchmany() if you want to batch up the fetches (defaults to 1 if you don't override it)

http://code.google.com/p/pyodbc/wiki/Cursor#fetchmany

来源：https://stackoverflow.com/questions/17707264/iterating-over-pyodbc-result-without-fetchall