C#全局变量

class myType
    {
        public static mylib_mysql mysql = new mylib_mysql();//全局mysql连接变量，一次连接，全局使用
        public static void  createSqlConnection(string server_ip,string username,string password,string database)
        {
            mysql.createMysqlConnect(server_ip, username, password, database);
        }
        public static mylib_mysql getMySqlConnection()
        {
            return mysql;
        }
        public static void closeMySqlConnection()
        {
            mysql.closeMysqlConnect();
        }
    }