用Qt Creator 对 leveldb 进行简单的读写

#include <iostream>
#include <string>
#include <leveldb/db.h>
#include <boost/lexical_cast.hpp>

using namespace std;

int main(int argc, char *const *argv)
{

    try
    {
        leveldb::DB* db;
        leveldb::Options options;
        options.create_if_missing = true;
        leveldb::Status status = leveldb::DB::Open(options, "./db", &db);

        cout << status.ok() << endl;

        for(int i=0; i<99999; i++)
        {
            string key = boost::lexical_cast<string>(i);
            string value = boost::lexical_cast<string>(i*i);
            db->Put(leveldb::WriteOptions(), key, value);
        }

        string key = "666";
        string value;

        db->Get(leveldb::ReadOptions(), key, &value);

        cout << value << endl;
        cout << 666*666 << endl;

        delete db;
    }
    catch(exception &e)
    {
        cout << e.what() << endl;
    }

    return 0;
}