Top Java Quiz Questions ☕️

Using PostgreSQL LISTEN / NOTIFY with Java

In my experience, integrating PostgreSQL's LISTEN and NOTIFY with Java can greatly enhance your application's efficiency when it comes to handling events. Here’s a quick rundown:

🔹 What is LISTEN/NOTIFY?
- LISTEN allows your application to subscribe to notifications, while NOTIFY sends a message to those listening.

🔹 Setting Up:
- You'll first need a PostgreSQL database. Ensure you have the PostgreSQL JDBC driver in your project.

🔹 Java Code Example:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;

public class NotifyExample {
    public static void main(String[] args) throws Exception {
        Connection connection = DriverManager.getConnection("jdbc:postgresql://localhost:5432/yourdb", "user", "password");
        Statement stmt = connection.createStatement();
        stmt.execute("LISTEN my_notification");
        
        // Wait for notifications
        while (true) {
            PGNotification[] notifications = conn.getNotifications();
            if (notifications != null) {
                for (PGNotification notification : notifications) {
                    System.out.println("Received notification: " + notification.getParameter());
                }
            }
            Thread.sleep(1000);
        }
    }
}

🔹 Publishing Notifications:
- You can send a notification with:

stmt.execute("NOTIFY my_notification, 'Hello World'");

Embrace the power of real-time notifications in your Java applications with PostgreSQL! 🚀

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394 viewsJun 9 at 13:00

Using PostgreSQL LISTEN / NOTIFY with Java

In my experience, integrating PostgreSQL's LISTEN and NOTIFY with Java can greatly enhance your application's efficiency when it comes to handling events. Here’s a quick rundown:

🔹 What is LISTEN/NOTIFY?
- LISTEN allows your application to subscribe to notifications, while NOTIFY sends a message to those listening.

🔹 Setting Up:
- You'll first need a PostgreSQL database. Ensure you have the PostgreSQL JDBC driver in your project.

🔹 Java Code Example:

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.Statement;
import java.sql.ResultSet;

public class NotifyExample {
    public static void main(String[] args) throws Exception {
        Connection connection = DriverManager.getConnection("jdbc:postgresql://localhost:5432/yourdb", "user", "password");
        Statement stmt = connection.createStatement();
        stmt.execute("LISTEN my_notification");
        
        // Wait for notifications
        while (true) {
            PGNotification[] notifications = conn.getNotifications();
            if (notifications != null) {
                for (PGNotification notification : notifications) {
                    System.out.println("Received notification: " + notification.getParameter());
                }
            }
            Thread.sleep(1000);
        }
    }
}

stmt.execute("NOTIFY my_notification, 'Hello World'");

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