9:25 a.m.
--000000000000a517d40574956804
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Thanks!
On Wed, Aug 29, 2018, 12:05 Howard Chu, <hyc(a)symas.com> wrote:
>
--00000000000018b43a057492d87f<br >
Content-Type: text/plain; charset=3D"UTF-8"<br > <br >
As far as point 2 is concerned I was basing it on this piece of code, =
where<br > it looks like
MDB_GET_MULTIPLE just checks some flags and then goes to=
the<br > fetchm label where the code
does nothing but retrieve data:<br
<br You're not reading the code
correctly. See below.<br > <br > case MDB_GET_MULTIPLE:<br > if (data =3D=3D NULL || !(mc->mc_flags
& C_INITIALIZED)) {<br > rc =3D EINVAL;<br > break;<br >
}<br > if (!(mc->mc_db->md_flags &
MDB_DUPFIXED)) {<br > rc =3D
MDB_INCOMPATIBLE;<br > break;<br > }<br >
rc =3D MDB_SUCCESS;<br > if
(!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) ||=
<br > (mc->mc_xcursor->mx_cursor.mc_flags
& C_EOF))<br > break;<br > goto fetchm;<br >
case MDB_NEXT_MULTIPLE:<br > if (data =3D=3D NULL)
{<br > rc =3D EINVAL;<br >
break;<br > }<br > if (!(mc->mc_db->md_flags &
MDB_DUPFIXED)) {<br > rc =3D
MDB_INCOMPATIBLE;<br > break;<br > }<br >
rc =3D mdb_cursor_next(mc, key, data, MDB_NEXT_DUP);<br >
if (rc =3D=3D MDB_SUCCESS) {<br > if
(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) {<br=
> MDB_cursor *mx;<br >
fetchm:<br > mx =3D
&mc->mc_xcursor->mx_cursor;<br >
data->mv_size =3D NUMKEYS(mx->mc_pg[mx->mc_top]) *<br > mx->mc_db->md_pad;<br > data->mv_data =3D
METADATA(mx->mc_pg[mx->mc_top]);<br >
mx->mc_ki[mx->mc_top] =3D NUMKEYS(mx->mc_pg[mx->mc_top])-1=
;<br <br ^^^ this line advances the
cursor.<br <br >
} else {<br > rc =3D
MDB_NOTFOUND;<br > }<br > }<br >
break;<br > <br > <br >
On Tue, Aug 28, 2018 at 8:26 PM Howard Chu <<a href=3D"mailto:openl=
dap-its(a)openldap.org" target=3D"_blank"
rel=3D"noreferrer">openldap-its@ope=
nldap.org</a>><br > wrote:<br > <br
>>> Full_Name: Karl Waclawek<br
>>> Version: LMDB 0.9.22<br
>>> OS: Windows 10<br
>>> URL: <a
href=3D"ftp://ftp.openldap.org/incoming/" rel=3D"noref=
errer noreferrer"
target=3D"_blank">ftp://ftp.openldap.org/incoming/</a>...
>>> Submission from: (NULL)
(2607:fea8:7a80:814:3ca9:e8f6:801c:d6f=
8)<br >>><br >>><br
>>> The documentation in lmdb.h for MDB_GET_MULTIPLE,
MDB_NEXT_MUL=
TIPLE and<br >>>
MDB_PREV_MULTIPLE seems to have two issues:<br
>>><br
>>> 1) The documentation indicates that both, the key and data,
ar=
e<br >> returned, but<br >> in<br
>>> reality only the data is returned.<br >><br
>> Looks like you're right. Since these are DUPs the key would
be=
the same<br >> every time so
there's no need to return it on each call.<br
>> Doc fixed in git mdb.master.<br
>><br >>> 2) The
documentation states that MDB_GET_MULTIPLE moves the cu=
rsor. This<br >> does<br >>> not seem to be true.<br >><br
>> The doc is correct here. The cursor is advanced far enough that
a<=
br >> MDB_NEXT_MULTIPLE will return the following
data, as opposed to ju=
st<br >> returning the same
data again.<br >><br > <br
<br <br
<br -- <br =C2=A0 =C2=A0-- Howard Chu<br =C2=A0
=C2=A0CTO, Symas Corp.=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a hr=
ef=3D"http://www.symas.com" rel=3D"noreferrer noreferrer"
target=3D"_blank"=
>http://www.symas.com</a><br =C2=A0
=C2=A0Director, Highland Sun=C2=A0 =C2=A0 =C2=A0<a href=3D"http://hi=
ghlandsun.com/hyc/" rel=3D"noreferrer noreferrer"
target=3D"_blank">http://=
highlandsun.com/hyc/</a><br =C2=A0
=C2=A0Chief Architect, OpenLDAP=C2=A0 <a href=3D"http://www.openldap=
.org/project/" rel=3D"noreferrer noreferrer"
target=3D"_blank">http://www.o=
penldap.org/project/</a><br
</blockquote></div
--000000000000a517d40574956804--
karl(a)waclawek.net wrote:
> --00000000000018b43a057492d87f
> Content-Type: text/plain; charset="UTF-8"
> As far as point 2 is concerned I was basing it on this
piece of code,
where
> it looks like MDB_GET_MULTIPLE just checks some flags and then goes to
the
> fetchm label where the code does nothing but retrieve data:
You're not reading the code correctly. See below.
> case MDB_GET_MULTIPLE:
> if (data == NULL || !(mc->mc_flags & C_INITIALIZED)) {
> rc = EINVAL;
> break;
> }
> if (!(mc->mc_db->md_flags & MDB_DUPFIXED)) {
> rc = MDB_INCOMPATIBLE;
> break;
> }
> rc = MDB_SUCCESS;
> if (!(mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) ||
> (mc->mc_xcursor->mx_cursor.mc_flags & C_EOF))
> break;
> goto fetchm;
> case MDB_NEXT_MULTIPLE:
> if (data == NULL) {
> rc = EINVAL;
> break;
> }
> if (!(mc->mc_db->md_flags & MDB_DUPFIXED)) {
> rc = MDB_INCOMPATIBLE;
> break;
> }
> rc = mdb_cursor_next(mc, key, data, MDB_NEXT_DUP);
> if (rc == MDB_SUCCESS) {
> if (mc->mc_xcursor->mx_cursor.mc_flags & C_INITIALIZED) {
> MDB_cursor *mx;
> fetchm:
> mx = &mc->mc_xcursor->mx_cursor;
> data->mv_size = NUMKEYS(mx->mc_pg[mx->mc_top]) *
> mx->mc_db->md_pad;
> data->mv_data = METADATA(mx->mc_pg[mx->mc_top]);
> mx->mc_ki[mx->mc_top] = NUMKEYS(mx->mc_pg[mx->mc_top])-1;
^^^ this line advances the cursor.
> } else {
> rc = MDB_NOTFOUND;
> }
> }
> break;
> On Tue, Aug 28, 2018 at 8:26
PM Howard Chu <openldap-its(a)openldap.org >
wrote:
>>> Full_Name: Karl Waclawek
>>> Version: LMDB 0.9.22
>>> OS: Windows 10
>>> URL: ftp://ftp.openldap.org/incoming/
>>> Submission from: (NULL) (2607:fea8:7a80:814:3ca9:e8f6:801c:d6f8)
>> >> >>> The documentation in lmdb.h for MDB_GET_MULTIPLE,
MDB_NEXT_MULTIPLE and
>>> MDB_PREV_MULTIPLE seems to have two issues:
>> >>> 1) The documentation
indicates that both, the key and data, are
>> returned, but
>> in
>>> reality only the data is returned.
> >> Looks like you're right. Since these are DUPs the
key would be the same
>> every time so there's no need to return it on each call.
>> Doc fixed in git mdb.master.
> >>> 2) The documentation states that MDB_GET_MULTIPLE
moves the cursor.
This
>> does
>>> not seem to be true.
> >> The doc is correct here. The cursor is advanced far
enough that a
>> MDB_NEXT_MULTIPLE will return the following data, as opposed to just
>> returning the same data again.
>
--
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/
--000000000000a517d40574956804
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Content-Transfer-Encoding: quoted-printable
<div dir=3D"auto">Thanks!</div><br><div
class=3D"gmail_quote"><div dir=3D"l=
tr">On Wed, Aug 29, 2018, 12:05 Howard Chu, <<a
href=3D"mailto:hyc@symas=
.com">hyc(a)symas.com</a>&gt; wrote:<br></div><blockquote
class=3D"gmail_quot=
e" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc
solid;padding-left:1ex">=
<a href=3D"mailto:karl@waclawek.net" target=3D"_blank"
rel=3D"noreferrer">k=
arl(a)waclawek.net</a> wrote:<br
874
days inactive
874
days old
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