C3rd

Visual C#: Connecting to MySQL remotely
Posted: 13 Apr 2009, 5:29am - Monday

I have a current project that connects to a remote database server using Visual C# as client window application. So before I started my project, I tested it if it is possible to connect and the result, it does connect. For those does who failed to solve this problem, here's my tutorial/guide. Test Project Requirements:

  • VMware Workstation 5.5
  • CentOS 4.4
  • Visual C# Express Edition
  • MySQL Data Connector .Net v1.0.7
Scenario: The client's OS is MS Windows XP and the server is CentOS Linux. The client will connect to the Linux server to query and process some transaction. But in the sample code, it demonstrate only how to connect remotely in the server. My server's IP address is 192.168.10.117 and a MySQL port of 3306 (default port). Screenshots:

[singlepic id=97 w=287 h=226 float=center]

Step 1: Setup the Linux server, be sure you already installed MySQL server. In our case, we use VMware and a CentOS 4.4 is installed. For installation help, google it! :P The first thing to do is configure your IP tables by using iptables command. see illustration below;

[singlepic id=95 w=400 h= float=center]

If your configuration does not allow foreign connection to your MySQL, then change that and allow it. In real scenario if your server is public, I recommend that you must have a new server which can only be access through local network. Or if cannot afford, just setup well the IP tables that only local connections are allowed. Anyway, here's my new IP tables setup in my server;

[singlepic id=96 w=400 h= float=center]

In MySQL CLI, create a user that can access everywhere. To do this, see sample below; mysql> GRANT ALL PRIVILEGES ON *.* to 'beasaw'@'%' IDENTIFIED BY 'qwerty'; Explained: the command shown above is to allow user, beasaw, to access anywhere using a password qwerty. That's it... server setup completed. :D Step 2: Before you create a new project in VCS, test first the connection using the command; C:\> mysql\bin\mysql --host=192.168.10.117 --port=3306 --user=beasaw --password=qwerty See image below;

[singlepic id=93 w=400 h= float=center]

Step 3:
  1. Open your Visual C# and create a new project, name it to remoteMySQL.
  2. In Form1.cs, layout just like the screenshot above.
  3. Add a reference, MySql.Data.dll (assumed that you already installed the MySQL data connector .Net v1.0.7)
  4. Add mysql to the project: using MySql.Data.MySqlClient;
  5. Begin your codes, see sample code (download link below)... :P

[singlepic id=98 w=287 h=226 float=center]

That's it... You can create as many applications you want with this method. Like Ticketing System, connecting 10 terminals to the servers simultaneously and etc. And of course, connection varies also to your MySQL server setup. :D Download: ยป mysqlremote_public.zip

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