我缺少什么将我的 C# 代码连接到 MySQL 数据库

Question

im very likely missing some obvious setup, im using XAMPP following a beginner project tutorial to make database, however i am getting an error System.ArgumentException : 'Option not supported. at

private MySqlConnection connection = new MySqlConnection("datasource:127.0.0.1;port=3306;username=root;password=;database=Csharp_Hotel_DB");

i already did search how to connect to MySQL but found no different than what said tutorial did:

-add MySql.Data.dll as reference,

- using MySql.Data.MySqlClient;

-making empty table at localhost/phpmyadmin via XAMPP

and then test the connection with if(table.Rows.Count > 0) {MessageBox.Show("Yes");} else {MessageBox.Show("No");} assigned to a button. the program works but clicking the button give error message above.

Answer 1

According to the example I found here (and an additional resource I often consult here for different RDBMSs I encounter), the parameters in your connection string are mis-named:

datasource:127.0.0.1;port=3306;username=root;password=;database=Csharp_Hotel_DB

It should be:

Server=127.0.0.1;Port=3306;Uid=root;Pwd=;Database=Csharp_Hotel_DB

It looks like you may be formatting the connection string based on MS SQL Server standards instead. Most C# examples you find online will likely have that since it's the same vendor. But the connection string depends on the RDBMS, not on the language connecting to it. Which in this case is MySQL.