我有以下代码:

rocksdb::DBWithTTL* db = ...
rocksdb::WriteOptions writeOptions;
rocksdb::ColumnFamilyHandle cfHandle = ...

std::string keyPrefix = "prefix";
std::string key = keyPrefix + "_key";
std::string value = "value";
rocksdb::Status s = db->Put(writeOptions, cfHandle, key, value);

rocksdb::ReadOptions readOptions;
readOptions.prefix_same_as_start;
readOptions.snapshot = db->GetSnapshot();
rocksdb::Iterator* iterator = db->NewIterator(readOptions);

rocksdb::Sliced start = rocksdb::Slice(keyPrefix);
for (iterator->Seek(start); iterator->Valid(); iterator->Next()) {
  printf("hello");
}


printf永远不会被点击。

但是,如果将Put行更改为:

rocksdb::Status s = db->Put(writeOptions, key, value);


意思是,删除column family handle,我将行打印得很好。

我猜迭代器API应该考虑到列族,但是我找不到任何文档。

最佳答案

实际上,缺少的API调用是:

rocksdb::Iterator* iterator = db->NewIterator(readOptions, cfHandle);

10-08 00:32