问题
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();
回答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
来源:https://stackoverflow.com/questions/23460954/c-sharp-mysql-create-user