C# MySql CREATE USER

Question

I was trying to make a registration statement with C#. Obviously I couldn't make it. I don't exactly know what the problem is. With that said here is a snippet:

MySqlConnection Connection = 
 new MySqlConnection("SERVER=localhost;UID=root;");
MySqlCommand Command = 
 new MySqlCommand("CREATE USER 'testuser'@'localhost' 
 IDENTIFIED BY 'superpassword';", Connection);
Command.ExecuteNonQuery();

Ouh that's hard to say. My exception-message outputs in german. I'll try to translate: The Index based on 0(null) must be greater or equal Null and less than the size of the argumentlist. — isastim
– isastim, Commented May 4, 2014 at 20:20

Steve · Accepted Answer · 2014-05-04 20:51:30Z

1

Before executing the command, you need to open the connection

using(MySqlConnection Connection = new MySqlConnection("SERVER=localhost;UID=root;"))
using(MySqlCommand Command = new MySqlCommand("CREATE USER 'testuser'@'localhost' IDENTIFIED BY 'superpassword';", Connection))
{
    Connection.Open();
    Command.ExecuteNonQuery();
}

Do not forget to enclose the disposable commands in a Using Statement

EDIT Looking at your code (why don't you put here immediately?) it is clear where is the error

this line

this.COMMAND = String.Format("CREATE USER '{0}'@'{1}' IDENTIFIED BY '{3}';", username, host, password);

should be

this.COMMAND = String.Format("CREATE USER '{0}'@'{1}' IDENTIFIED BY '{2}';", username, host, password);

There are three parameters passed to the string format, so the indexes to be used for the placeholders in the string.format are 0, 1 and 2.
You used 3 for the password and this gives the out of range exception

edited May 4, 2014 at 20:51

answered May 4, 2014 at 20:07

Steve

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6 Comments

isastim Over a year ago

Oh, sorry almost forgot that. thanks ;) But I still have the problem. Connection.Open(); didn't fix it :( I close my connection with if(Connection.State == ConnectionState.Open){ Connection.Close();} But I think it does pretty the same :)

Steve Over a year ago

What is the error message? It is raised on the Command.ExecuteNonQuery line?. I have tested the same code here and I don't have any error here

isastim Over a year ago

Do I need to specify it if I just want to Create a MySql-User? If I type this command into PHPMyAdmin without selecting a certain Database it creates a new user without problems.

Steve Over a year ago

No, I tested it and you don't need it

isastim Over a year ago

See here to see a more detailed snippet. I made a Class which has some basic MySql functions....so don't wonder ^_^ pastebin.com/1YQLT9cJ Thanks for your support.

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