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mdbx: backport - Add MDB_PREV_MULTIPLE.

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Logical counterpart to GET_MULTIPLE, NEXT_MULTIPLE

Change-Id: I3f42cb1599997e79dbdc76bcf23b78314ededfc9
This commit is contained in:
Howard Chu 2016-01-07 18:28:29 +00:00 committed by Leo Yuriev
parent c0c3c1b688
commit ba29ae2cd2
2 changed files with 25 additions and 1 deletions
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4
lmdb.h
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@ -384,7 +384,9 @@ typedef enum MDB_cursor_op {
MDB_PREV_NODUP, /**< Position at last data item of previous key */
MDB_SET, /**< Position at specified key */
MDB_SET_KEY, /**< Position at specified key, return key + data */
MDB_SET_RANGE /**< Position at first key greater than or equal to specified key. */
MDB_SET_RANGE, /**< Position at first key greater than or equal to specified key. */
MDB_PREV_MULTIPLE /**< Position at previous page and return key and up to
a page of duplicate data items. Only for #MDB_DUPFIXED */
} MDB_cursor_op;
/** @defgroup errors Return Codes

22
mdb.c
View File

@ -6327,6 +6327,28 @@ fetchm:
}
}
break;
case MDB_PREV_MULTIPLE:
if (data == NULL) {
rc = EINVAL;
break;
}
if (!(mc->mc_db->md_flags & MDB_DUPFIXED)) {
rc = MDB_INCOMPATIBLE;
break;
}
if (!(mc->mc_flags & C_INITIALIZED))
rc = mdb_cursor_first(mc, key, data);
else {
MDB_cursor *mx = &mc->mc_xcursor->mx_cursor;
if (mx->mc_flags & C_INITIALIZED) {
rc = mdb_cursor_sibling(mx, 0);
if (rc == MDB_SUCCESS)
goto fetchm;
} else {
rc = MDB_NOTFOUND;
}
}
break;
case MDB_NEXT:
case MDB_NEXT_DUP:
case MDB_NEXT_NODUP: