JDBC连接数据库

  Class.forName("com.mysql.jdbc.Driver");
  String url = "jdbc:mysql://127.0.0.1:3306/test";
  Connection con = (Connection) DriverManager.getConnection(url);
  Statement stmt = (Statement) con.createStatement();
  String query = "SELECT * FROM tmp";
  ResultSet rs = stmt.executeQuery(query);