mongocxx基本增删改查操作

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mongodb 的C++驱动分为mongocxx和legacy（旧版本）两个版本。2个版本的驱动安装和API都不相同。现在仅介绍mongocxx版本的操作。

#include <iostream>#include <bsoncxx/json.hpp>#include <mongocxx/client.hpp>#include <mongocxx/stdx.hpp>#include <mongocxx/uri.hpp>#include<mongocxx/instance.hpp>using bsoncxx::builder::stream::close_array;using bsoncxx::builder::stream::close_document;using bsoncxx::builder::stream::document;using bsoncxx::builder::stream::finalize;using bsoncxx::builder::stream::open_array;usingbsoncxx::builder::stream::open_document;mongocxx::instance instance{}; // This should be doneonly once.mongocxx::uri uri("mongodb://localhost:27018");mongocxx::client client(uri);mongocxx::database db = client["mydb"];//获取数据库“mydb”,如果client是指针类型，则可以通过database()方法获取。 //获取集合mongocxx::collection coll = db["test"];//获取test集合auto builder =bsoncxx::builder::stream::document{};bsoncxx::document::value doc_value = builder<< "name" << "MongoDB"<< "type" << "database"<< "count" << 1<< "versions" <<bsoncxx::builder::stream::open_array<< "v3.2" << "v3.0" << "v2.6"<< close_array<< "info" <<bsoncxx::builder::stream::open_document<< "x"<< 203<< "y" << 102<<bsoncxx::builder::stream::close_document<< bsoncxx::builder::stream::finalize; //插入一条数据coll.insert_one(doc_value.view()); //删除一条数据coll.delete_one(document{}<<" name "<<"MongoDB"<<" type "<< " database "<<finalize); //更新一条数据collSiaNeName.update_one(document{}<<" name "<<"MongoDB"  <<finalize,document{}<<"$set"<<open_document<<"type"<<"data"<<close_document<<finalize);//查询一个集合 mongocxx::stdx::optional<bsoncxx::document::value> result = coll.find_one(document{}  <<" name"<<"MongoDB"<<finalize);   if(result){        bsoncxx::document::view view = (*result).view();        std::string Name = view["name"].get_utf8().value.to_string();//获取查询到的name的值，若是double类型则为view["name"].get_double();    }//建立索引coll.create_index(std::move(document{}<<" name"<<1<<finalize));//对“name”建立索引,1为按升序创建索引，-1为按降序创建索引coll.create_index(std::move(document{}<<" name"<<1<<” type”<<1<<finalize));//对“name”和“type”建立索引

参考链接：https://mongodb.github.io/mongo-cxx-driver/

http://mongodb.github.io/mongo-cxx-driver/api/mongocxx-3.1.1/classbsoncxx_1_1document_1_1element.html

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