[英]Using rocksdb::Iterator and Column Family is not working
I have the following piece of code: 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");
}
The printf
is never hit. printf
永远不会被击中。
However, if I change the Put
line to: 但是,如果我将“ Put
行更改为:
rocksdb::Status s = db->Put(writeOptions, key, value);
Meaning, removing the column family handle
, I'm getting the line printed fine. 意思是,删除column family handle
,使行打印得很好。
I'm guessing the iterator API should take the column family into account, but I couldn't find any documentation. 我猜迭代器API应该考虑到列族,但是我找不到任何文档。
实际上,缺少的API调用是:
rocksdb::Iterator* iterator = db->NewIterator(readOptions, cfHandle);
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