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+// 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;
+}