将C＃连接到MYSQL数据库？

Question

So i been trying to connect C# windows from to MYSQL database, i tryed many different methods that i found online but none seems to be working. here is my code please help (keep in mind this is the first time i use database before).

Here is the connecting class

class DbConnect
{
    public static void DBConnect()
    {
        string connstr = 
        "server=localhost;user=root;database=login;port=3306;password=Password";

        MySqlConnection conn = new MySqlConnection(connstr);

        try
        {
            conn.Open();
        }
        catch
        {
            Console.WriteLine("went rong");
        }
    }

}

Here is the windows form im using

private void btnenter_Click(object sender, EventArgs e)
 {
      DbConnect.DBConnect();
      MySqlCommand query = new MySqlCommand("INSERT INTO logininfo (username, 
      password) VALUES(@username, @password");
        try
        {
            query.Parameters.AddWithValue("@username", txtusername.Text);
            query.ExecuteNonQuery();
            MessageBox.Show("S");
        }

        catch (Exception )
        {
            MessageBox.Show("something went wrong");
        }
        finally
        {
            DbConnect.DBClose();
        }

    }

Answer 1

User is passed in MySQL connection string using Uid . So your connection string should be like:

"server=localhost;Uid=root;database=login;port=3306;password=tro63jans";

You may see: MySQL connection string.

You should also catch exception in some object, so that you can get the details about the exception. Currently you are not showing any useful message from your exception.

catch (Exception ex) //at least
{
    MessageBox.Show("something went wrong: " + ex.ToString());
}

Answer 2

One problem you have here is you're not setting the Connection property of your MysqlCommand to the MySqlConnection you're making earlier.

1. Change DBConnect() to return your MySqlConnection.
2. Set your MySqlCommand's Connection property to the returned value.

PSEUDO-CODE

MySqlConnection conn = DBConnect.DBConnect();
 MySqlCommand command = new MySqlCommand(commandStr, conn);
command.ExecuteNonQuery();
conn.Close();