mongodb-connection-lib/examples/usage.js

A comprehensive MongoDB connection library with CRUD operations, connection pooling, and model abstraction

const DatabaseService = require("../src/services/DatabaseService");
const User = require("../src/models/User");

async function main() {
  try {
    // Connect to database
    await DatabaseService.connect();

    // Health check
    const health = await DatabaseService.healthCheck();
    console.log("Health check:", health);

    // Create a new user
    const userData = {
      name: "John Doe",
      email: "john.doe@example.com",
      age: 30,
    };

    const user = new User(userData);
    await user.save();
    console.log("User created:", user);

    // Find user by email
    const foundUser = await User.findByEmail("john.doe@example.com");
    console.log("Found user:", foundUser);

    // Update user
    await User.updateById(foundUser._id, { age: 31, name: "John Updated" });
    console.log("User updated");

    // Find all users
    const allUsers = await User.findAll();
    console.log("All users:", allUsers);

    // Direct database operations
    const directResult = await DatabaseService.find("users", {
      age: { $gte: 25 },
    });
    console.log("Users 25 and older:", directResult);

    // Aggregation example
    const aggregationPipeline = [
      { $match: { age: { $gte: 18 } } },
      { $group: { _id: null, averageAge: { $avg: "$age" } } },
    ];
    const avgAge = await DatabaseService.aggregate(
      "users",
      aggregationPipeline
    );
    console.log("Average age:", avgAge);
  } catch (error) {
    console.error("Error in main function:", error);
  } finally {
    // Disconnect from database
    await DatabaseService.disconnect();
  }
}

// Handle graceful shutdown
process.on("SIGINT", async () => {
  console.log("Received SIGINT, shutting down gracefully...");
  await DatabaseService.disconnect();
  process.exit(0);
});

process.on("SIGTERM", async () => {
  console.log("Received SIGTERM, shutting down gracefully...");
  await DatabaseService.disconnect();
  process.exit(0);
});

main();