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;
}
