leveldb安装及第一个程序

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os: ubuntu 14.04 lts

leveldb version=1.19

安装

cd leveldb

make

此时leveldb/下多出out-shared和out-static目录，其中out-shared/下有：

db db_bench helpers libleveldb.so libleveldb.so.1 libleveldb.so.1.19 port table util

然后sudo cp out-shared/libleveldb.so* /usr/local/lib & sudo cp -R include/* /usr/local/include

完成。

第一个程序

test_leveldb.cc

#include <cassert>#include <iostream>#include <string>#include <cstdlib>#include <leveldb/db.h>int main(){leveldb::DB *db;leveldb::Options options;leveldb::Status status;std::string key1 = "key1";std::string val1 = "val1", val;options.create_if_missing = true;status = leveldb::DB::Open(options, "/tmp/testdb", &db);if (!status.ok()){std::cout << status.ToString() << std::endl;exit(1);}status = db->Put(leveldb::WriteOptions(), key1, val1);if (!status.ok()){std::cout << status.ToString() << std::endl;exit(2);}status = db->Get(leveldb::ReadOptions(), key1, &val);if (!status.ok()){std::cout << status.ToString() << std::endl;exit(3);}std::cout << "Get val: " << val << std::endl;status = db->Delete(leveldb::WriteOptions(), key1);if (!status.ok()){std::cout << status.ToString() << std::endl;exit(4);}status = db->Get(leveldb::ReadOptions(), key1, &val);if (!status.ok()){std::cout << status.ToString() << std::endl;exit(5);}std::cout << "Get val: " << val << std::endl;return 0;}

编译：g++ -o dbtest test_leveldb.cc -lleveldb

运行：./dbtest

output：

Get val: val1
NotFound:

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