8d44d792c3
Summary: Quick fixes to examples to make it easier to get familiar with RocksDB for Windows users: - Set proper temporary directory path on Windows for all examples (with C++17 we should start using std::filesystem) - Fixed typo and got rid of warnings treated as errors in multi_processes_example.cc - Get number of available cores on Windows in c_simple_example.c - Add command to remove DB directory for Windows in compaction_filter_example.cc (print error, but carry on with example upon error, because error code is returned if there is no such directory on Windows) Pull Request resolved: https://github.com/facebook/rocksdb/pull/7304 Reviewed By: jay-zhuang Differential Revision: D23450900 Pulled By: pdillinger fbshipit-source-id: 4256134deb6ae6bb267ed1bd69f814842b95f60f
79 lines
2.2 KiB
C++
79 lines
2.2 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/slice.h"
|
|
#include "rocksdb/options.h"
|
|
|
|
using namespace ROCKSDB_NAMESPACE;
|
|
|
|
#if defined(OS_WIN)
|
|
std::string kDBPath = "C:\\Windows\\TEMP\\rocksdb_column_families_example";
|
|
#else
|
|
std::string kDBPath = "/tmp/rocksdb_column_families_example";
|
|
#endif
|
|
|
|
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(
|
|
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;
|
|
}
|