connection must be valid and open 錯誤在visual studio中 [英]Connection must be valid and open error in visual studio
MySql Visual Studio 2017(錯誤:您已經有一個可用的連接) [英]MySql Visual Studio 2017 (Error: You have a usable connection already)
無法將 MySQL 服務器連接到 Visual Studio; 連接錯誤 40 [英]Cannot connect MySQL server to visual studio; Connection Error 40