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c: support seek_for_prev

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Summary:
support seek_for_prev in c abi.
Closes https://github.com/facebook/rocksdb/pull/1457

Differential Revision: D4135360

Pulled By: lightmark

fbshipit-source-id: 61256b0
This commit is contained in:
Jay Lee 2016-11-08 12:36:05 -08:00 committed by Facebook Github Bot
parent 0f17f9279b
commit a7875272d7
3 changed files with 12 additions and 0 deletions
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5
db/c.cc
View File

@ -1031,6 +1031,11 @@ void rocksdb_iter_seek(rocksdb_iterator_t* iter, const char* k, size_t klen) {
iter->rep->Seek(Slice(k, klen));
}
void rocksdb_iter_seek_for_prev(rocksdb_iterator_t* iter, const char* k,
size_t klen) {
iter->rep->SeekForPrev(Slice(k, klen));
}
void rocksdb_iter_next(rocksdb_iterator_t* iter) {
iter->rep->Next();
}

4
db/c_test.c
View File

@ -495,6 +495,10 @@ int main(int argc, char** argv) {
CheckIter(iter, "foo", "hello");
rocksdb_iter_seek(iter, "b", 1);
CheckIter(iter, "box", "c");
rocksdb_iter_seek_for_prev(iter, "g", 1);
CheckIter(iter, "foo", "hello");
rocksdb_iter_seek_for_prev(iter, "box", 3);
CheckIter(iter, "box", "c");
rocksdb_iter_get_error(iter, &err);
CheckNoError(err);
rocksdb_iter_destroy(iter);

3
include/rocksdb/c.h
View File

@ -347,6 +347,9 @@ extern ROCKSDB_LIBRARY_API void rocksdb_iter_seek_to_first(rocksdb_iterator_t*);
extern ROCKSDB_LIBRARY_API void rocksdb_iter_seek_to_last(rocksdb_iterator_t*);
extern ROCKSDB_LIBRARY_API void rocksdb_iter_seek(rocksdb_iterator_t*,
const char* k, size_t klen);
extern ROCKSDB_LIBRARY_API void rocksdb_iter_seek_for_prev(rocksdb_iterator_t*,
const char* k,
size_t klen);
extern ROCKSDB_LIBRARY_API void rocksdb_iter_next(rocksdb_iterator_t*);
extern ROCKSDB_LIBRARY_API void rocksdb_iter_prev(rocksdb_iterator_t*);
extern ROCKSDB_LIBRARY_API const char* rocksdb_iter_key(