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List: openldap-technical
Subject: Re: LMDB cursor position
From: Howard Chu <hyc () symas ! com>
Date: 2024-02-03 16:30:53
Message-ID: d99922bc-581c-e394-695a-311be7a5cc20 () symas ! com
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M Gurschi wrote:
> Hello Howard,
>
> Tell me please, after *mdb_cursor_get(key, data, MDB_SET_RANGE)*, if i want to \
> consume the key, if i understand correctly the key will be updated (on success). \
> Will the reference to data also be updated or do i need to do:
> *mdb_cursor_get(key, data, MDB_GET_CURRENT)* to get data to point at the data from \
> the key?
That would be a useless behavior for the API if it required that, wouldn't it.
>
> Kind Regards,
> Maxim Gurschi
>
> On 1 Feb 2024, at 20:21, M Gurschi <max.gurschi@gmail.com> wrote:
>
> Understood, thank you!
>
> Kind Regards,
> Maxim Gurschi
>
> On 1 Feb 2024, at 17:53, Howard Chu <hyc@symas.com> wrote:
>
> M Gurschi wrote:
> > Hello team,
> >
> > Can you please let me know, when using *mdb_cursor_get* with *MDB_SET* operation, \
> > in case the key is not present in the db, where is the cursor left pointing?
> > My scenario is that i want to retrieve two adjacent keys.
> >
> > 1. first *mdb_cursor_get* with *MDB_SET*
> > 2. after that, *mdb_cursor_get* with *MDB_NEXT*
> >
> > I'm wondering what can i expect the cursor to point at in case the key is not \
> > found in step 1.
>
> You cannot expect anything in particular.
>
> Use MDB_SET_RANGE instead.
>
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
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