mirror of
https://github.com/facebook/rocksdb.git
synced 2024-11-27 20:43:57 +00:00
56 lines
1.4 KiB
C++
56 lines
1.4 KiB
C++
// Copyright (c) 2013, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under the BSD-style license found in the
|
|
// LICENSE file in the root directory of this source tree. An additional grant
|
|
// of patent rights can be found in the PATENTS file in the same directory.
|
|
#include <cstdio>
|
|
#include <string>
|
|
|
|
#include "rocksdb/db.h"
|
|
#include "rocksdb/slice.h"
|
|
#include "rocksdb/options.h"
|
|
|
|
using namespace rocksdb;
|
|
|
|
std::string kDBPath = "/tmp/rocksdb_simple_example";
|
|
|
|
int main() {
|
|
DB* db;
|
|
Options options;
|
|
// Optimize RocksDB. This is the easiest way to get RocksDB to perform well
|
|
options.IncreaseParallelism();
|
|
options.OptimizeLevelStyleCompaction();
|
|
// create the DB if it's not already present
|
|
options.create_if_missing = true;
|
|
|
|
// open DB
|
|
Status s = DB::Open(options, kDBPath, &db);
|
|
assert(s.ok());
|
|
|
|
// Put key-value
|
|
s = db->Put(WriteOptions(), "key1", "value");
|
|
assert(s.ok());
|
|
std::string value;
|
|
// get value
|
|
s = db->Get(ReadOptions(), "key1", &value);
|
|
assert(s.ok());
|
|
assert(value == "value");
|
|
|
|
// atomically apply a set of updates
|
|
{
|
|
WriteBatch batch;
|
|
batch.Delete("key1");
|
|
batch.Put("key2", value);
|
|
s = db->Write(WriteOptions(), &batch);
|
|
}
|
|
|
|
s = db->Get(ReadOptions(), "key1", &value);
|
|
assert(s.IsNotFound());
|
|
|
|
db->Get(ReadOptions(), "key2", &value);
|
|
assert(value == "value");
|
|
|
|
delete db;
|
|
|
|
return 0;
|
|
}
|