From e6918187568dbd01842d8d1d2c808ce16a894239 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sun, 21 Apr 2024 13:54:28 +0200
Subject: Adding upstream version 18.2.2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 src/rocksdb/examples/column_families_example.cc | 88 +++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 src/rocksdb/examples/column_families_example.cc

(limited to 'src/rocksdb/examples/column_families_example.cc')

diff --git a/src/rocksdb/examples/column_families_example.cc b/src/rocksdb/examples/column_families_example.cc
new file mode 100644
index 000000000..3828d3fb3
--- /dev/null
+++ b/src/rocksdb/examples/column_families_example.cc
@@ -0,0 +1,88 @@
+// 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;
+}
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