无法连接到任何指定的mysql C＃

Question

I can't connect to my sql server, i tried some fixes from stackoverflow and google and it didn't help me. Thanks.

  connString = "SERVER ='''myserverip''';PORT=3306;DATABASE=mydatabase;UID=myuser;PASSWORD=mypassword";
        try
         {
             conn = new MySqlConnection();
             conn.ConnectionString = connString;
             conn.Open();
             MessageBox.Show("Connection success");

         }
         catch (MySql.Data.MySqlClient.MySqlException ex)
         {
             MessageBox.Show(ex.Message);
         }

To configure myuser I used this on my linux vps.

CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypassword'; CREATE USER 'myuser'@'%' IDENTIFIED BY 'mypassword'; GRANT ALL ON *.* TO 'myuser'@'localhost'; GRANT ALL ON *.* TO 'myuser'@'%';

i tried : Unable to connect to any of the specified mysql hosts. C# MySQL ( i tried to use MySqlConnectionStringBuilder, don't specify the port, instead of password in connection string i typed psw); Disable my pc firewall, disable linux server firewall

Answer 1

MySqlConnectionStringBuilder does enable you to specify port. Just tested, this works just fine:

MySqlConnectionStringBuilder csb = new MySqlConnectionStringBuilder();
csb.Server = "192.168.1.105";
csb.Port = 3307;
csb.Database = "test";
csb.UserID = "me";
csb.Password = "mypassword";

cn = new MySqlConnection(csb.ToString());
cn.Open();

Are you quite sure your MySql server actually accepts incoming connections over TCP? By default that is disabled.

Answer 2

So, after searching on google how to setup sql connection in linux, and trying different setups hardly I fixed it so I want to share with stackoverflow how I fixed it. Thanks for help @Avo Nappo .

First you need to comment out the line #bind-address from your sql config. The accepted answer here : MySQL root access from all hosts .

Then I create a user using this command CREATE USER 'golden'@'%' IDENTIFIED BY 'password'; GRANT ALL PRIVILEGES ON * . * TO 'golden'@'%'; CREATE USER 'golden'@'%' IDENTIFIED BY 'password'; GRANT ALL PRIVILEGES ON * . * TO 'golden'@'%'; And in c# I used my default connection string that is in the question. I don't know why but MySqlConnectionStringBuilder dose not work on my pc. I hope this will help someone. Have a nice day and keep coding.

Answer 3

You must go in your Remote MySQL in your C-Pannel and Add Access Host first and change this code

connString = "SERVER ='''myserverip''';PORT=3306;DATABASE=mydatabase;UID=myuser;PASSWORD=mypassword";

to

connString = "SERVER =*Put here your Hostname with Port*;DATABASE=mydatabase;UID=myuser;PASSWORD=mypassword;";

Or use this Method

MySqlConnectionStringBuilder ConStD = new MySqlConnectionStringBuilder();

ConStD.Server = "Hostname that get from Manage Access Hosts";
ConStD.Port = Port that get from Manage Access Hosts;
ConStD.Database = "YourDatabaseName";
ConStD.UserID = "yourUsername";
ConStD.Password = "yourpassword";

try
{
    MySqlConnection conn = new MySqlConnection(ConStD.ToString());
    conn.Open();
    MessageBox.Show("connection Success");
}
catch (MySqlException ex)
{
    MessageBox.Show(ex.Message);
}

It's Must working For You