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mdbx: add MDBX_SET_UPPERBOUND for cursors.

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Resolves https://github.com/erthink/libmdbx/issues/250.
This commit is contained in:
Leonid Yuriev
2021-12-13 03:40:12 +03:00
parent bee5df20fd
commit 4e44dc69f9
2 changed files with 32 additions and 7 deletions
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25
mdbx.h
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@@ -1572,18 +1572,33 @@ enum MDBX_cursor_op {
* a page of duplicate data items. */
MDBX_PREV_MULTIPLE,
/** Position at first key-value pair greater than or equal to specified,
* return both key and data, and the return code depends on a exact match.
/** Positions cursor at first key-value pair greater than or equal to
* specified, return both key and data, and the return code depends on whether
* a exact match.
*
* For non DUPSORT-ed collections this work the same to \ref MDBX_SET_RANGE,
* but returns \ref MDBX_SUCCESS if key found exactly and
* but returns \ref MDBX_SUCCESS if key found exactly or
* \ref MDBX_RESULT_TRUE if greater key was found.
*
* For DUPSORT-ed a data value is taken into account for duplicates,
* i.e. for a pairs/tuples of a key and an each data value of duplicates.
* Returns \ref MDBX_SUCCESS if key-value pair found exactly and
* Returns \ref MDBX_SUCCESS if key-value pair found exactly or
* \ref MDBX_RESULT_TRUE if the next pair was returned. */
MDBX_SET_LOWERBOUND
MDBX_SET_LOWERBOUND,
/** Positions cursor at first key-value pair greater than specified,
* return both key and data, and the return code depends on whether a
* upper-bound was found.
*
* For non DUPSORT-ed collections this work the same to \ref MDBX_SET_RANGE,
* but returns \ref MDBX_SUCCESS if the greater key was found or
* \ref MDBX_NOTFOUND otherwise.
*
* For DUPSORT-ed a data value is taken into account for duplicates,
* i.e. for a pairs/tuples of a key and an each data value of duplicates.
* Returns \ref MDBX_SUCCESS if the greater pair was returned or
* \ref MDBX_NOTFOUND otherwise. */
MDBX_SET_UPPERBOUND
};
#ifndef __cplusplus
/** \ingroup c_cursors */