Reverse iteration indexed by prefix RocksDb

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Reverse iteration indexed by prefix RocksDb



I'm currently using a RocksDB database for a personal project and I try to get all the content in reverse order of my database which is indexed by a prefix. However I don't manage to find the good code for my loop. I fell like I'm missing something. Here is my code :


//My iterator is already created with the rocksdb::ReadOptions()
rocksdb::Slice keyreinterpret_cast<const char *>(indexToFind), sizeof(indexToFind;
std::vector<int> ids;

it->SeekForPrev(key);
auto currentKey = it->key();
while(it->Valid() && it->key().starts_with(key))

/* Some custom treatment here */

it->SeekForPrev(it->key());
it->Prev();
currentKey = it->key();


if (!it->status().ok())
std::cout << it->status().ToString() << std::endl;

assert(it->status().ok()); // Check for any errors found during the scan



Cheers and thanks in advance,
Clément.









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