读取MongoDB ObjectID并转换为string

来源：互联网发布：windows安装器编辑：程序博客网时间：2024/06/01 07:47

c++代码为：

boost::shared_ptr<LoginPage> LoginService::Login(const std::string& email, const std::string& pwd) {  boost::shared_ptr<LoginPage> login_page(new LoginPage);  mongo::BSONObjBuilder condition;  condition.append("email", email);  condition.append("pwd", pwd);  mongo::Query query(condition.obj());    boost::shared_ptr<MongoSession> session = MongoSessionFactory::GetSession();  std::string db_name =  MyApp::Instance().get_config().mongo_db_name;  std::unique_ptr<mongo::DBClientCursor> cursor = session->get().query("ide_site.login", query, 1);  if (cursor->more()) {    mongo::BSONObj record = cursor->next();    mongo::BSONElement e = record.getField("_id");    if (record.getObjectID(e)) {      mongo::OID oid = e.__oid();      login_page->oid = oid.toString();　    }       }  return login_page;}

如果mongodb存储的是　{ "_id" : ObjectId("5420013272fe096c39901048"), "email" : "laoro@xx.com", "pwd" : "123456" },

则上面的login_page->oid 就为5420013272fe096c39901048．

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