如何查找表的当前大小(内存中)？

   public static void main(String[] args) {

       String url = "jdbc:mysql://localhost:3306/<数据库名>";

       String username = "<用户名>";

       String password = "<密码>";

       try (Connection conn = DriverManager.getConnection(url, username, password)) {

           String tableName = "<表名>";

           String query = "SELECT table_name AS \"Table\", round(((data_length + index_length) / 1024 / 1024), 2) AS \"Size (MB)\" FROM information_schema.TABLES WHERE table_schema = ? AND table_name = ?";

           PreparedStatement statement = conn.prepareStatement(query);

           statement.setString(1, "<数据库名>");

           statement.setString(2, tableName);

           ResultSet resultSet = statement.executeQuery();

           if (resultSet.next()) {

               String table = resultSet.getString("Table");

               double size = resultSet.getDouble("Size (MB)");

               System.out.println("Table: " + table);

               System.out.println("Size (MB): " + size);

           } else {

               System.out.println("Table not found.");

           }

       } catch (SQLException e) {

           e.printStackTrace();

       }

   }