issue_comments: 865497846

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https://github.com/simonw/sqlite-utils/issues/290#issuecomment-865497846 https://api.github.com/repos/simonw/sqlite-utils/issues/290 865497846 MDEyOklzc3VlQ29tbWVudDg2NTQ5Nzg0Ng== 9599 2021-06-22T03:21:38Z 2021-06-22T03:21:38Z OWNER

The Python docs say: https://docs.python.org/3/library/sqlite3.html

To retrieve data after executing a SELECT statement, you can either treat the cursor as an iterator, call the cursor’s fetchone() method to retrieve a single matching row, or call fetchall() to get a list of the matching rows.

Looking at the C source code, both fetchmany() and fetchall() work under the hood by assembling a Python list: https://github.com/python/cpython/blob/be1cb3214d09d4bf0288bc45f3c1f167f67e4514/Modules/_sqlite/cursor.c#L907-L972 - see calls to PyList_Append()

So it looks like the most efficient way to iterate over a cursor may well be for row in cursor: - which I think calls this C function: https://github.com/python/cpython/blob/be1cb3214d09d4bf0288bc45f3c1f167f67e4514/Modules/_sqlite/cursor.c#L813-L876

 
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