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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 18:24:20 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 18:24:20 +0000 |
commit | 483eb2f56657e8e7f419ab1a4fab8dce9ade8609 (patch) | |
tree | e5d88d25d870d5dedacb6bbdbe2a966086a0a5cf /src/rocksdb/examples/column_families_example.cc | |
parent | Initial commit. (diff) | |
download | ceph-upstream.tar.xz ceph-upstream.zip |
Adding upstream version 14.2.21.upstream/14.2.21upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/rocksdb/examples/column_families_example.cc | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/rocksdb/examples/column_families_example.cc b/src/rocksdb/examples/column_families_example.cc new file mode 100644 index 00000000..589ff8ec --- /dev/null +++ b/src/rocksdb/examples/column_families_example.cc @@ -0,0 +1,72 @@ +// 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; + +std::string kDBPath = "/tmp/rocksdb_column_families_example"; + +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 + delete cf; + 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) { + delete handle; + } + delete db; + + return 0; +} |