0376869f05
Summary: As title. This is part of an fb-internal task. First, remove all `using namespace` statements if applicable. Next, utilize multiple build platforms and see if anything is broken. Should anything become broken, fix the compilation errors with as little extra change as possible. Pull Request resolved: https://github.com/facebook/rocksdb/pull/9369 Test Plan: internal build and make check make clean && make static_lib && cd examples && make all Reviewed By: pdillinger Differential Revision: D33517260 Pulled By: riversand963 fbshipit-source-id: 3fc4ce6402a073421dfd9a9b2d1c79441dca7a40
94 lines
2.7 KiB
C++
94 lines
2.7 KiB
C++
// Copyright (c) 2011-present, Facebook, Inc. All rights reserved.
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// This source code is licensed under both the GPLv2 (found in the
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// COPYING file in the root directory) and Apache 2.0 License
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// (found in the LICENSE.Apache file in the root directory).
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#include <cstdio>
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#include <string>
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#include "rocksdb/db.h"
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#include "rocksdb/slice.h"
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#include "rocksdb/options.h"
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using ROCKSDB_NAMESPACE::DB;
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using ROCKSDB_NAMESPACE::Options;
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using ROCKSDB_NAMESPACE::PinnableSlice;
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using ROCKSDB_NAMESPACE::ReadOptions;
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using ROCKSDB_NAMESPACE::Status;
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using ROCKSDB_NAMESPACE::WriteBatch;
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using ROCKSDB_NAMESPACE::WriteOptions;
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#if defined(OS_WIN)
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std::string kDBPath = "C:\\Windows\\TEMP\\rocksdb_simple_example";
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#else
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std::string kDBPath = "/tmp/rocksdb_simple_example";
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#endif
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int main() {
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DB* db;
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Options options;
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// Optimize RocksDB. This is the easiest way to get RocksDB to perform well
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options.IncreaseParallelism();
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options.OptimizeLevelStyleCompaction();
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// create the DB if it's not already present
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options.create_if_missing = true;
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// open DB
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Status s = DB::Open(options, kDBPath, &db);
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assert(s.ok());
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// Put key-value
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s = db->Put(WriteOptions(), "key1", "value");
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assert(s.ok());
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std::string value;
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// get value
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s = db->Get(ReadOptions(), "key1", &value);
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assert(s.ok());
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assert(value == "value");
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// atomically apply a set of updates
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{
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WriteBatch batch;
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batch.Delete("key1");
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batch.Put("key2", value);
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s = db->Write(WriteOptions(), &batch);
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}
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s = db->Get(ReadOptions(), "key1", &value);
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assert(s.IsNotFound());
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db->Get(ReadOptions(), "key2", &value);
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assert(value == "value");
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{
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PinnableSlice pinnable_val;
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db->Get(ReadOptions(), db->DefaultColumnFamily(), "key2", &pinnable_val);
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assert(pinnable_val == "value");
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}
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{
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std::string string_val;
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// If it cannot pin the value, it copies the value to its internal buffer.
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// The intenral buffer could be set during construction.
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PinnableSlice pinnable_val(&string_val);
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db->Get(ReadOptions(), db->DefaultColumnFamily(), "key2", &pinnable_val);
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assert(pinnable_val == "value");
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// If the value is not pinned, the internal buffer must have the value.
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assert(pinnable_val.IsPinned() || string_val == "value");
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}
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PinnableSlice pinnable_val;
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s = db->Get(ReadOptions(), db->DefaultColumnFamily(), "key1", &pinnable_val);
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assert(s.IsNotFound());
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// Reset PinnableSlice after each use and before each reuse
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pinnable_val.Reset();
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db->Get(ReadOptions(), db->DefaultColumnFamily(), "key2", &pinnable_val);
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assert(pinnable_val == "value");
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pinnable_val.Reset();
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// The Slice pointed by pinnable_val is not valid after this point
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delete db;
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return 0;
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}
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