How to make a connection localhost and my database - database

Question

I'm using NetBeans to make a web application and using pgadmin4 for my database. The problem is when I'm making a connection pool.
This is my database http://prntscr.com/hzwn9h and I think the problem is because I want something like that http://prntscr.com/hzwnj2 but I have this http://prntscr.com/hzwnrw. I have tried a lot of solutions but it doesn't work and I don't know what else I have to do. One of the things I have tried was this https://rivaso.wordpress.com/2012/02/19/how-to-setup-a-new-database-in-postgresql-and-glassfish/ but unfortunately unsuccessful

Answer 1

Following code snippet shows how to establish connection for PostgreSQL using jdbc driver. Make sure to add jdbc driver to libraries.
public Connection DBConnect() {
try {
String host = "localhost";//host
String port = "5432";//db port
String db = "exp";//database name
String user = "root";//database username
String pass = "1234";//password
//connection url
String url = "jdbc:postgresql://" + host + ":" + port + "/" + db;
//initialize jdbc driver for postger sql
Class.forName("org.postgresql.Driver");
Connection conn = DriverManager.getConnection(url, user, pass);
//return connection
return conn;
} catch (Exception e) {
System.out.println("Error : " + e.getMessage());
return null;
}
}
reference : jdbc.postgresql.org

Answer 2

public static void main (String[] args) {
try {
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/yourdatabasename";
Connection conn = DriverManager.getConnection(url, user,password);
conn.close();
} catch (Exception e) {
System.err.println("Got an exception! ");
System.err.println(e.getMessage());
}
}