PQntuples for older version (2.2.1) of psycopg2 with ctypes
| От | Alan Evans |
|---|---|
| Тема | PQntuples for older version (2.2.1) of psycopg2 with ctypes |
| Дата | |
| Msg-id | CAMFVOoWFa6w1nFU34gNFpVzA8UJ-wc=rW3Oa2imqub3Y6K1uhg@mail.gmail.com обсуждение исходный текст |
| Ответы |
Re: PQntuples for older version (2.2.1) of psycopg2 with ctypes
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| Список | psycopg |
I am using cursor.copy_expert and I would like to be able to use cursor.rowcount but most of the systems I am targeting have older psycopg2 versions on them.
According to the following URL rowcount was updated for use with copy_expert in 2.5.3...
https://psycopg.lighthouseapp.com/projects/62710/tickets/180-return-number-of-rows-for-copy-operationsInspired by:
I wonder if it is possible to use ctypes to do this... Something like this maybe:
import ctypes
libpq = ctypes.CDLL('libpq.so.5')
conn = psycopg2.connect(foo)
cursor = conn.cursor()
cursor.copy_expert(bar)
rowcount = libpq.PQntuples(???)
I can "read" the psycopg2 source but I am not fluent. I am having trouble working out what 'pgres' is. Is it the fileno() the backend_process_id() etc...
So far all I have manged to do is segfault my python processes. Woot!
Is 'pgres' exposed by the Cursor or Connection classes somewhere?
Regards,
-Alan
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