levelDB遍历问题

[xiaolomg]

有码有真相：

// test.cpp : Defines the entry point for the console application.
//

#include <tchar.h>
#include <stdio.h>
#include <Windows.h>
#include <iostream>
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include "leveldb.h"
#include <boost/lexical_cast.hpp>
using std::cout;
using std::endl;
//
#if defined _DEBUG

#if defined LEVELDB_DLL
#pragma comment(lib,"..\\_exports\\DebugDll\\leveldb_d.lib")
#else
#pragma comment(lib,"..\\_exports\\Debug\\leveldb_d.lib")
#endif

#else

#if defined LEVELDB_DLL
#pragma comment(lib,"..\\_exports\\ReleaseDll\\leveldb.lib")
#else
#pragma comment(lib,"..\\_exports\\Release\\leveldb.lib")
#endif

#endif


#define DB_BENCH

#if defined LEVELDB_DLL
#undef DB_BENCH
#undef DB_TEST
#endif

void WriteDb(leveldb::DB* db)
{
    const char* Content = "We now decided that after three years it might";
    char Buff[10];
    ZeroMemory(Buff,sizeof(Buff));
    leveldb::WriteOptions wo;
    wo.sync = false;
    for(int i = 0 ; i < 20 ;i++)
	{
        _itoa_s(i,Buff,10);

        leveldb::Status s = db->Put(wo,Buff,Content);
    }
}

void ReadDb(leveldb::DB* db)
{
	leveldb::Iterator* it = db->NewIterator(leveldb::ReadOptions());
	for (it->SeekToFirst(); it->Valid(); it->Next()) 
	{
		cout << it->key().ToString() << ": "  << it->value().ToString() << endl;
//这里出现了无限循环，纳闷了，不应该啊，难道我用的版本有问题？
	}
}

int main()
{
	leveldb::DB* db;
	leveldb::Options options;
	options.create_if_missing = true;
	leveldb::Status status = leveldb::DB::Open(options, "/tmp/testdb", &db);
	assert(status.ok());
	WriteDb(db);
	ReadDb(db);
}

知道的大婶提示下，为毛会出现无限循环？