怎么把sqlserver连接改成MySQL连接public static Connection cn; public static Statement st; public static ResultSet rs; public static boolean joinDB() { boolean joinFlag; try { joinFlag = true; Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); cn = DriverManager.getConnection("jdbc:odbc:EmployeeInformationMS","sa",""); cn.setCatalog("EmployeeInformationMS"); System.out.println("数据库连接成功");