Java-尝试与远程SQL数据库建立连接

Question

I'm trying to connect to a remote SQL database that I can access via web through http://smart.ihu.edu.gr/phpmyadmin/ . The database inside that is awesomedb/pwndoes' . That's where the tables that I want to use are.

The thing is, I'm completely new to Database/mySQL connectivity in applications and even though I've tried working through the examples posted here: Connect Java to a MySQL database I've been unable to connect to the DB yet.

Here's my code:

package thesistest;

import java.sql.*;


public class ThesisTest {


public static void main(String[] args) 
{   
    //-------------------------------------
    //  JDBC driver initialisation
    //-------------------------------------
    try
    {
        System.out.println("Loading driver...");
        Class.forName("com.mysql.jdbc.Driver");
        System.out.println("Driver loaded!");
    }
    catch(ClassNotFoundException e)
    {
        throw new RuntimeException("Cannot find the driver in the classpath!", e);
    }

    //-------------------------------------
    //  Driver loaded, let's try establishing a connection.
    //-------------------------------------
    String url = "jdbc:mysql://smart.ihu.edu.gr/phpmyadmin/awesomedb/pwnodes";
    String username = "root";
    String password = "[redacted]";
    Connection connection = null;
    try
    {
        System.out.println("Connecting database...");
        connection = DriverManager.getConnection(url, username, password);
        System.out.println("Database connected!");
    }
    catch (SQLException e)
    {
        throw new RuntimeException("Cannot connect the database!", e);
    } 
    finally 
    {
        System.out.println("Closing the connection.");
        if (connection != null) try { connection.close(); } catch (SQLException ignore) {}
    }

}   //end of main

}   //end of class ThesisTest

I'm convinced that the URL I'm typing in is wrong. Note that the database is remote and I do not have an instance of any mySQL software running on my machine . Is it possible to just connect a simple java app with a remote DB this way?

Note 2: I have tried putting :3306 at the end of the smart.ihu.edu.gr link, to no avail. Thanks for the headsup, @NickJ

By the way, here's the result of the build+run:

(Full resolution here: http://i.imgur.com/qlj6jJC.png )

Answer 1

Java returns Unknown Database because it´s searching for a database on /awesomedb/pwnodes but the path you give is a table.
You have to give Java the path to your awesomedb and connect to it.
After that you send something like:

INSERT INTO pwnodes (col_name,...)

Code for connecting:

package theistest;


import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;

   public class ThesisTest {

 public static void main(String[] argv) {

System.out.println("-------- MySQL JDBC Connection Testing ------------");

try {
Class.forName("com.mysql.jdbc.Driver");
 } catch (ClassNotFoundException e) {

System.out.println("Where is your MySQL JDBC Driver?");
    e.printStackTrace();
    return;
}

System.out.println("MySQL JDBC Driver Registered!");
Connection connection = null;

try {
    String url = "jdbc:mysql://smart.ihu.edu.gr:3306/awesomedb";
    String username = "root";
    String password = "[redacted]";
connection = DriverManager.getConnection(url, username, password);

} catch (SQLException e) {
    System.out.println("Connection Failed! Check output console");
    e.printStackTrace();
    return;
}

if (connection != null) {
    System.out.println("You made it, take control your database now!");
} else {
    System.out.println("Failed to make connection!");
}
}
}

Answer 2

I don't think you have to go to phpmyadmin URL path. My assumption is that MySQL runs on port 3306 on that server, but you don't need to reach phpmyadmin .

So I'd try the following URL: jdbc:mysql://smart.ihu.edu.gr:3306/awesomedb/pwnodes