mirror of https://github.com/facebook/rocksdb.git
89 lines
2.5 KiB
C++
89 lines
2.5 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
|
|
// This source code is licensed under both the GPLv2 (found in the
|
|
// COPYING file in the root directory) and Apache 2.0 License
|
|
// (found in the LICENSE.Apache file in the root directory).
|
|
#include <cstdio>
|
|
#include <string>
|
|
#include <vector>
|
|
|
|
#include "rocksdb/db.h"
|
|
#include "rocksdb/options.h"
|
|
#include "rocksdb/slice.h"
|
|
|
|
#if defined(OS_WIN)
|
|
std::string kDBPath = "C:\\Windows\\TEMP\\rocksdb_column_families_example";
|
|
#else
|
|
std::string kDBPath = "/tmp/rocksdb_column_families_example";
|
|
#endif
|
|
|
|
using ROCKSDB_NAMESPACE::ColumnFamilyDescriptor;
|
|
using ROCKSDB_NAMESPACE::ColumnFamilyHandle;
|
|
using ROCKSDB_NAMESPACE::ColumnFamilyOptions;
|
|
using ROCKSDB_NAMESPACE::DB;
|
|
using ROCKSDB_NAMESPACE::DBOptions;
|
|
using ROCKSDB_NAMESPACE::Options;
|
|
using ROCKSDB_NAMESPACE::ReadOptions;
|
|
using ROCKSDB_NAMESPACE::Slice;
|
|
using ROCKSDB_NAMESPACE::Status;
|
|
using ROCKSDB_NAMESPACE::WriteBatch;
|
|
using ROCKSDB_NAMESPACE::WriteOptions;
|
|
|
|
int main() {
|
|
// open DB
|
|
Options options;
|
|
options.create_if_missing = true;
|
|
DB* db;
|
|
Status s = DB::Open(options, kDBPath, &db);
|
|
assert(s.ok());
|
|
|
|
// create column family
|
|
ColumnFamilyHandle* cf;
|
|
s = db->CreateColumnFamily(ColumnFamilyOptions(), "new_cf", &cf);
|
|
assert(s.ok());
|
|
|
|
// close DB
|
|
s = db->DestroyColumnFamilyHandle(cf);
|
|
assert(s.ok());
|
|
delete db;
|
|
|
|
// open DB with two column families
|
|
std::vector<ColumnFamilyDescriptor> column_families;
|
|
// have to open default column family
|
|
column_families.push_back(ColumnFamilyDescriptor(
|
|
ROCKSDB_NAMESPACE::kDefaultColumnFamilyName, ColumnFamilyOptions()));
|
|
// open the new one, too
|
|
column_families.push_back(
|
|
ColumnFamilyDescriptor("new_cf", ColumnFamilyOptions()));
|
|
std::vector<ColumnFamilyHandle*> handles;
|
|
s = DB::Open(DBOptions(), kDBPath, column_families, &handles, &db);
|
|
assert(s.ok());
|
|
|
|
// put and get from non-default column family
|
|
s = db->Put(WriteOptions(), handles[1], Slice("key"), Slice("value"));
|
|
assert(s.ok());
|
|
std::string value;
|
|
s = db->Get(ReadOptions(), handles[1], Slice("key"), &value);
|
|
assert(s.ok());
|
|
|
|
// atomic write
|
|
WriteBatch batch;
|
|
batch.Put(handles[0], Slice("key2"), Slice("value2"));
|
|
batch.Put(handles[1], Slice("key3"), Slice("value3"));
|
|
batch.Delete(handles[0], Slice("key"));
|
|
s = db->Write(WriteOptions(), &batch);
|
|
assert(s.ok());
|
|
|
|
// drop column family
|
|
s = db->DropColumnFamily(handles[1]);
|
|
assert(s.ok());
|
|
|
|
// close db
|
|
for (auto handle : handles) {
|
|
s = db->DestroyColumnFamilyHandle(handle);
|
|
assert(s.ok());
|
|
}
|
|
delete db;
|
|
|
|
return 0;
|
|
}
|