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Add MDB_PREV_MULTIPLE (collected mdb.master changes)

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Logical counterpart to GET_MULTIPLE, NEXT_MULTIPLE
This commit is contained in:
Howard Chu 2016-01-07 18:28:29 +00:00 committed by Hallvard Furuseth
parent fe2b1cd731
commit f24d7d2c83
2 changed files with 31 additions and 4 deletions
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9
libraries/liblmdb/lmdb.h
View file

@ -388,7 +388,9 @@ 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
@ -1095,8 +1097,9 @@ int mdb_txn_renew(MDB_txn *txn);
* This flag may only be used in combination with #MDB_DUPSORT. This option
* tells the library that the data items for this database are all the same
* size, which allows further optimizations in storage and retrieval. When
* all data items are the same size, the #MDB_GET_MULTIPLE and #MDB_NEXT_MULTIPLE
* cursor operations may be used to retrieve multiple items at once.
* all data items are the same size, the #MDB_GET_MULTIPLE, #MDB_NEXT_MULTIPLE
* and #MDB_PREV_MULTIPLE cursor operations may be used to retrieve multiple
* items at once.
* <li>#MDB_INTEGERDUP
* This option specifies that duplicate data items are binary integers,
* similar to #MDB_INTEGERKEY keys.

26
libraries/liblmdb/mdb.c
View file

@ -1437,7 +1437,7 @@ mdb_strerror(int err)
* and the actual use of the message uses more than 4K of stack.
*/
#define MSGSIZE 1024
#define PADSIZE 4096
#define PADSIZE 4096
char buf[MSGSIZE+PADSIZE], *ptr = buf;
#endif
int i;
@ -6215,6 +6215,30 @@ 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_last(mc, key, data);
else
rc = MDB_SUCCESS;
if (rc == MDB_SUCCESS) {
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: