I am unable to connect to a MySQL server which is hosted on a linux server through netbeans.
All of these credentials work when connecting through MySQL Workbench "Standard TCP/IP through ssh".
Here is my code:
public class Database {
private static final String DRIVER = "com.mysql.jdbc.Driver";
private static final String URL = "jdbc:mysql://john.myschool.edu:3306/cs3610";
private static final String USERNAME = "mbrooke";
private static final String PASSWORD = "mypass";
private Connection connection;
public Database() throws Exception{
try{
connect();
}catch(SQLException e){
if(connection !=null){
connection.close();
}
}
}
//Open connection to database
private void connect() throws Exception{
connection = null;
Class.forName (DRIVER).newInstance ();
connection = DriverManager.getConnection(URL,USERNAME,PASSWORD);
}
}
I am getting SQLException with #521 on the line that starts "connection = DriverManager..." and I'm not sure what is causing this problem. The driver seems to be installed correctly as, when stepping through, I make it past the "Class.forName(D..." line with no exceptions thrown.
It sounds like your Database server doesn't have port 3306 open, or your MySQL credentials aren't allowed to use remote connections.
MySQL Workbench's TCP/IP over SSH setting first opens an SSH connection to the SSH server, then connects to the database server (often localhost or 127.0.0.1). So the MySQL connection is actually initiated from the SSH server. So the ability to connect through that channel only demonstrates that your java code would work if it were running on the server into which you're SSHing. But you may still have a firewall or MySQL permissions issue when trying to run the code from another machine.
I would try downloading a MySQL client to your machine and seeing if you can connect using that method: mysql -h myDatabaseServer.school.edu cs3610 -u mbrooke -p'mypass' and see if that works. You'll likely either get a "connection not available" error or a "user mbrooke doesn't have permission to access remotely" which should give you some insight into which problem you're facing.
Try it without ending slash
URL = "jdbc:mysql://john.myschool.edu:3306/cs3610/";
like
URL = "jdbc:mysql://john.myschool.edu:3306/cs3610";
or you have a Database named "cs3610/"
Related
I am trying to connect to SQL Server using my credentials.
The data I am provided is to connect is the following:
Server: Ccddb294\oss_prod
Database: OSS_DW
Code:
public static void main(String arg[]) throws ClassNotFoundException, SQLException {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String dbURL = "jdbc:sqlserver://ccddb294.corp.corpcom.com:1433;databaseName=OSS_DW;integratedSecurity=true";
Connection conn = DriverManager.getConnection(dbURL,"corp\\e21290","Anjali#1234");
if (conn != null) {
System.out.println("Connected");
}
}
I am not sure where to give oss_prod in server name. When I try to connect, I get this error:
Exception in thread "main" com.microsoft.sqlserver.jdbc.SQLServerException: Integrated authentication failed. ClientConnectionId:26ddec01-2e7e-46c3-8165-4f3646da5e7c
Can someone validate if the dbURL which I created is correct as per specification or do I need to add odd_prod - but if so, where? (Note: The dll file is correctly placed in bin and i am able to connect to server at least but not able to authenticate only)
After lots of hit and trials.
Following is correct db URL:
"jdbc:sqlserver://ccddb294.corp.corpcom.com:1433;
instanceName=oss_prod;
databaseName=OSS_DW;
integratedSecurity=true;
domain=corp;
authenticationscheme=NTLM;
user=e21290;
password=Anjali#1234";
I want to write a java application that uses a mysql database to store and retrieve information. I am still just a beginner and I do not have a lot of knowledge on web hosting providers and server architecture. In this application, several clients will have to access this remote database located on a server machine maybe.
Currently, I can connect to the database from the same computer that runs the mysql server (I am using workbench by the way). Any suggestions on what should I do?
public static Connection openDatabase()
{
Connection myConn;
try {
myConn =
DriverManager.getConnection(Configs.getProperty("DatabaseURL"));
return myConn;
} catch (SQLException e) {
e.printStackTrace();
}
return null;
}
The url is:
jdbc:mysql://Atomic-PC:3306/test?autoReconnect=true&rewriteBatchedStatements=true&useSSL=false&user=root&password=password
First of all you have to find connection URL, port and credential from MySql workbench you are using. If hosting provider provides a public IP for DB server you should be able to access it from anywhere by using following code in Java.
import java.sql.Connection;
import java.sql.DriverManager;
public class Main {
public static void main(String[] argv) throws Exception {
String driver = "com.mysql.jdbc.Driver";
String connection = "jdbc:mysql://localhost:3306/YourDBName";
String user = "root";
String password = "root";
Class.forName(driver);
Connection con = DriverManager.getConnection(connection, user, password);
if (!con.isClosed()) {
con.close();
}
}
}
For this reason you have to import mysql connection driver to your application first.
If you are trying to connect to remote database then yo need to change the database url from localhost to remote server ip address.
jdbc:mysql://Atomic-PC:3306/test
to
jdbc:mysql://<db-server-ip-address>:<db-server-port>/<db-name>
Assuming, remote server ip address is 10.234.05.123 and database port number is 3300 and database name is remoteDB. Then,
jdbc:mysql://10.234.05.123:3300/remoteDB
your web hosting company should be able to provide you with the url:port which you can use in your connection string to connect to MySQL(or any other remote db for that matter)
When I'm trying to get connetcion with online mysql database I get this error:
java.sql.SQLException: Access denied for user ''#'89.229.59.50' (using password: NO)
My code is:
public static Statement stmt = null;
public static Connection conn = null;
private static final String dbURL ="jdbc:mysql://db4free.net:3306/dolar;user=neir#localhost&password=password";
private static void createConnection() {
try {
conn = DriverManager.getConnection(dbURL);
} catch (Exception except) {
except.printStackTrace();
}
}
And yes, I've added mysql connector to my project.
You have to make sure the user (neir) has remote access privileges.
If your using a hosting service make sure they allow your remote IP (89.229.59.50) to connect to MySQL Server.
If you're managing the MySQL Server make sure that it's configured to be accessed remotely, that's done in the my.cnf file, search and comment the line:
bind-address = 127.0.0.1
Hope this helps.
From the error you can already see that the user and password parameters are not used. This might give you a clue that there is something wrong with the JDBC connection URL.
You cannot put the user and password parameters in the connection URL.
You should use: getConnection(String url, String user, String password)
See: https://docs.oracle.com/javase/8/docs/api/java/sql/DriverManager.html#getConnection-java.lang.String-java.lang.String-java.lang.String-
This might be for user has not access privileges so you should do this.
CREATE USER 'enterusername'#'xxx.xxx.xxx.xxx' IDENTIFIED BY 'enterpassword';
Where xxx.xxx.xxx.xxx is you IP or if you want to do this for any IP then just write '%' instead 'xxx.xxx.xxx.xxx'
To grant privileges
GRANT ALL PRIVILEGES ON mor.* TO 'enterusername'#'xxx.xxx.xxx.xxx' WITH GRANT OPTION ;
hello i am trying to connect my application to online database using the following code
import javax.swing.*;
import java.sql.*;
public class javacon {
Connection con = null;
private static final String url ="jdbc:mysql:\\sql204.byethost9.com:3306\\";
private static final String dbName = "b9_16134488_db";
private static final String userName = "b9_16134488";
private static final String password = "123.321";
public static Connection connectDB(){
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con =DriverManager.getConnection("jdbc:mysql://sql204.byethost9.com:3306/b9_16134488_db/",userName,password);
JOptionPane.showMessageDialog(null, "connection is succseful");
return con;
}catch(Exception e){
JOptionPane.showMessageDialog(null, e);
return null;
}
}
}
but i am getting error says the driver has not received any packet
from the server
i found one answer this one says i have to go to my cpanel in my host and add my ip address there but i need every user to be connect to the database to login and logout
Mysql database has file my.cnf where bind-address might be specified. If that is not there, then mysql bind itself to all interfaces, otherwise only to specified one. More about this Bind-address
Also I guess user must have permissions to connect to database. 'user'#'ipaddress'. And more you can read here Connection access
Your code seems fine, your problem probably is related with your MySQL database not allowing connections from your host. The easiest way to find if this is the problem is trying to connect to the database from the same machine with the same credentials with MySQL Workbench.
There are three main things that can block your MySQL from receiving external connections:
1) Configuration
Edit my.cnf removing the following line:
bind-address = 127.0.0.1
2) User Host
In MySQL all users have defined from which host the connection can home from. 'user'#'%' would allow you to connect from any host.
3) Firewall
Make sure that the port 3306 is open.
I am trying to connect to a MySQL Server using JDBC tool in java (using eclipse). I was just wondering how to enter 2 user/password combinations. The first one is the one I use to connect to the server(for example when I ssh into the server) and the second one I enter into phpmyadmin. As of now, I am putting in the phpmyadmin password only into the jdbc connection properties and it's not connecting. This is my current statement:
conn = DriverManager.getConnection("jdbc:mysql://[IP of server]:3306/[Database Table name]", "[UserName (same as phpmyadmin)]","[Password (same as phpmyadmin)]");
I am getting a
java.sql.SQLException: null, message from server: "Host '[My computer's full host name]' is not allowed to connect to this MySQL server"
I was just wondering if I needed to enter my server login/password (the one I use for ssh) as well in addition to the phpmyadmin username/pwd. I am new to JDBC and MySQL server, so I would appreciate any tips.
Just for background, I am able to connect successfully through ssh and I can login to the server through phpmyadmin.
Here's how you can create an account that can access your server from another client machine:
CREATE USER 'bobby'#'localhost' IDENTIFIED BY 'some_password';
That creates the user, and says he can connect from localhost.
If he is on the machine 192.168.0.5, you'd do something like this:
CREATE USER 'bobby'#'192.168.0.5' IDENTIFIED BY 'some_password';
Then of course, you have to grant privileges appropriately:
GRANT ALL PRIVILEGES ON databasename.* TO 'bobby'#'localhost' WITH GRANT OPTION;
GRANT ALL PRIVILEGES ON databasename.* TO 'bobby'#'192.168.0.5' WITH GRANT OPTION;
That's been my experience anyway.
You're probably better off reading this section on how to specify MySQL accounts.
When you log in from PHPMyAdmin, the web server is located on the same server that hosts the Mysql database (in your case). Mysql, by default, does not allow connections from remote hosts; only the local machine may access the database.
I'll take a shot in the dark and say that the computer you're running the java code on is not the same machine that is hosting the mysql server. You must configure Mysql to allow connections from remote hosts via the config file and then change the Host row of the mysql.users table for the specified user to allow connection from your IP address (or, if security isn't your concern, any IP address.)
To configure mysql to allow connections from remote hosts you must remove the "bind-address=" line from the configuration file.
To allow any host to log on to a specific mysql user, you must set the mysql.users Host` column to "%".
Both of these must be done.
public class MysqlConnect{
public static void main(String[] args) {
System.out.println("MySQL Connect Example.");
Connection conn = null;
String url = "jdbc:mysql://localhost:3306/";
String dbName = "jdbctutorial";
String driver = "com.mysql.jdbc.Driver";
String userName = "root";
String password = "root";
try {
Class.forName(driver).newInstance();
conn = DriverManager.getConnection(url+dbName,userName,password);
System.out.println("Connected to the database");
conn.close();
System.out.println("Disconnected from database");
} catch (Exception e) {
e.printStackTrace();
}
}
}