Re: Newbie Developer Question
| От | Matthew Campbell |
|---|---|
| Тема | Re: Newbie Developer Question |
| Дата | |
| Msg-id | c2cc277f0702010858q16e6ae21qfece5981e59c06af@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: Newbie Developer Question (Tom Lane <tgl@sss.pgh.pa.us>) |
| Ответы |
Re: Newbie Developer Question
|
| Список | pgsql-novice |
Thanks so much for the help. _hash_first, and _hash_next all take the scan object as a parameter. How do you create or get a scan object? hashbeginscan looks like it sets up a scan and returns it, but it takes the number of keys and the array of scan keys. Where do we get these arguments from?
-Matt
-Matt
On 2/1/07, Tom Lane <tgl@sss.pgh.pa.us > wrote:
"Matthew Campbell" < mtthw.cmpbll@gmail.com> writes:
> ... We've been digging through the src/backend/access/hash/
> and we're having a hard time figuring out the correct way to walk through
> items in a page. Is this what the hashbeginscan() method is for?
No, hashbeginscan doesn't do much at all except initialize state. The
interesting stuff happens during successive hashgettuple calls ---
specifically _hash_first the first time and _hash_next on later calls.
regards, tom lane
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