What is CRUD operation ?
- Basically this term use in the database (like SQL,Mongo etc).
2. In Database we generally perform four operation :
C – Create : It will be perform create database by Inserting data .
R – Read : It will be perform Read operation of database.
U – Update : It will be perform Update Database by using unique key.
D – Delete : It will be perform Delete operation in Database using unique key.
3 . Example
#include <iostream> #include <bits/stdc++.h> #include <bsoncxx/builder/stream/document.hpp> #include <bsoncxx/json.hpp> #include <mongocxx/client.hpp> #include <mongocxx/instance.hpp> #include <cstdint> #include <mongocxx/stdx.hpp> #include <mongocxx/uri.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; using bsoncxx::builder::stream::open_document; using bsoncxx::builder::basic::kvp; using bsoncxx::builder::basic::make_document; using bsoncxx::builder::basic::make_array; using namespace std; int main () { int n; int oid; char Firstname[15]; char Lastname[15]; char Company[15]; mongocxx::instance instance{}; mongocxx::uri uri("mongodb://localhost:27017"); mongocxx::client client(uri); std::cout <<"1. INSERT\n"; std::cout <<"2. DELETE\n"; std::cout <<"3. SEARCH\n"; std::cout <<"4. UPDATE\n"; std::cout <<"Chosse No.\n"; std::cin >>n; mongocxx::database db = client["TCS"]; mongocxx::collection coll = db["Employee"]; auto builder = bsoncxx::builder::stream::document{}; bsoncxx::document::value doc_value; switch (n) { case 1: cout <<" ID Firstname Lastname Company"; cin >>oid >>Firstname >>Lastname >>Company; bsoncxx::document::value restaurant_doc = make_document(bsoncxx::document::value doc_value = make_document( kvp("id", oid) , kvp("Firstname",Firstname), kvp("Lastname",Lastname), kvp("Company" ,Company))); auto res = coll.insert_one(std::move(doc_value)); break; case 2: cout <<" ID "; cin >>oid; coll.delete_one(make_document(kvp("ID", oid))); break; case 3: cout <<" Enter Firstname"; cin >>Firstname; auto cursor = coll.find(make_document(kvp("Firstname", Firstname))); for (auto&& doc : cursor) { std::cout << bsoncxx::to_json(doc) << std::endl; } break; case 4: cout <<" Enter id"; cin >>oid; cout<<"Company Name"; cin>> Company; coll.update_one( make_document(kvp("id", oid)), make_document(kvp("$set", make_document(kvp("Company", Company))))); break; default: break; } return 0; }
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