System.net.Sockets异常

Question

So I'm trying to connect to a MySQL database sitting on an Ubuntu VM using C#. However, I keep getting a System.Net.Sockets.SocketException exception and the connection fails every time. I can access the server on the VM using it's IP address (on a browser) so I'm not really understanding whats wrong.

Any help is much appreciated.

Answer 1

Did you try telnet to the mysql server from where you are trying to connect, telnet localhost 3306 localhost is your mysql server and 3306 is default port. If this is successful then it means that mysql is running correctly. Also you can verify if the credentials are passed correctly. Below is sample JNDI configuration for connecting to mysql from liferay portal server

<Resource name="jdbc/LiferayPool" auth="Container" type="javax.sql.DataSource"
      maxActive="100" maxIdle="30" maxWait="10000"
     username="root" password="" driverClassName="com.mysql.jdbc.Driver"
     url="jdbc:mysql://localhost/liferay?useUnicode=true&amp;characterEncoding=UTF-8&amp;useFastDateParsing=false"/>

Hope this helps.

Answer 2

If your server is ok you may try the ADO.Net driver for MySQL ( http://www.mysql.com/downloads/connector/net/ )

After you install the driver, add a reference to MySql.Data.dll in you project.

In your code, you can connect to the server using:

public static MySqlConnection mysqlCreateConection() {            
        try {
            c = new MySqlConnection("server=" + "localhost" + ";user id=" + "user" +
                                    ";Password=" + "password" + ";persist security info=True;database=" + mysqlDatabase +  "" + ";");
            c.Open();
            Console.WriteLine(c.ToString());
            return c;
        } catch (MySqlException e) {}

With this connector you can use classes and methods already made to make your life easier when dealing with c# + mysql.