Merge pull request #79 from Xtha-Sunil/main

Sample OODB using c++

Author: devsdenepal

c++/customOODB.cpp

@@ -0,0 +1,92 @@
+// Sample of Object Oriented Database (OODB) using C++. 
+
+#include <iostream>
+#include <fstream>
+#include <string>
+#include <map>
+using namespace std;
+
+// Defining the structure of object
+class Person {
+private:
+    string name;
+    int age;
+
+public:
+    Person() : age(0) {}    // Default age 0
+    Person(string n, int a) : name(n), age(a) {}
+
+    string getName() const { return name; }
+    int getAge() const { return age; }
+
+    void save(ofstream& out) const {
+        out << name << '\n' << age << '\n';
+    }
+
+    void load(ifstream& in) {
+        getline(in, name);
+        in >> age;
+        in.ignore();  // this consumes the leftover newlines
+    }
+
+    void display() const {
+        cout << "Name: " << name << ", Age: " << age << endl;
+    }
+};
+
+int main() {
+    // Object to store
+    Person person1("Alice", 30);
+    Person person2("Bob", 25);
+
+    // concept of key,value to save and retrieve
+    map<string, Person> db;
+    db["alice"] = person1;
+    db["bob"] = person2;
+
+    // Simulated DB using file handeling
+    ofstream outFile("assets/mydatabase.txt");
+    if (!outFile) {
+        cerr << "Error opening file for writing." << endl;
+        return 1;
+    }
+
+    for (auto& entry : db) {
+        string key = entry.first;
+        Person& person = entry.second;
+
+        outFile << key << '\n';
+        person.save(outFile);  
+    }
+    outFile.close();
+    cout << "Objects saved to database successfully.\n";
+
+    // Reading from the DB (txt file)
+    ifstream inFile("assets/mydatabase.txt");
+    if (!inFile) {
+        cerr << "Error opening file for reading." << endl;
+        return 1;
+    }
+
+    map<string, Person> loadedDb;
+    while (true) {
+        string key;
+        if (!getline(inFile, key)) break;
+
+        Person p;
+        p.load(inFile);
+        loadedDb[key] = p;
+    }
+    inFile.close();
+
+    // Display the saved data
+    cout << "\nRetrieved objects from database:\n";
+    for (auto& entry : loadedDb) {
+        string key = entry.first;
+        Person& person = entry.second;
+        cout << "Key: " << key << " -> ";
+        person.display();
+    }
+
+    return 0;
+}