Simple reading and writing of LEVELDB with Qt Creator

#include <iostream>#include<string>#include<leveldb/db.h>#include<boost/lexical_cast.hpp>using namespacestd;intMainintargcChar*Const*argv) {    Try{leveldb::D b*DB;        Leveldb::options Options; Options.create_if_missing=true; Leveldb::status Status= Leveldb::D b::open (Options,"./db", &db); cout<< Status.ok () <<Endl;  for(intI=0; i<99999; i++)        {            stringKey = boost::lexical_cast<string>(i); stringValue = boost::lexical_cast<string> (i*i); DB-Put (Leveldb::writeoptions (), key, value); }        stringKey ="666"; stringvalue; DB->get (Leveldb::readoptions (), Key, &value); cout<< value <<Endl; cout<<666*666<<Endl;    Delete db; }    Catch(Exception &e) {cout<< e.what () <<Endl; }    return 0;}

Code is not special, because QT creator in the compile time will be added -mmacosx-version-min=10.6 such parameters, so we compile LIBLEVELDB.A time also need to add this parameter, otherwise under QT will error.

The. Pro file needs to add these two lines:

 
   LIBS + =-l/opt/local/lib/-lleveldb

Includepath + =/opt/local/include

Simple reading and writing of LEVELDB with Qt Creator