Oracle如何建立一个网上书店，请给出代码

建立一个网上书店需要很多的工作，涉及到前端、后端、数据库等多个方面。这里只提供一个Java Web应用程序的代码示例，基于Oracle数据库，用于展示商品信息和处理订单。

前端代码（HTML、CSS、JavaScript）省略：

后端代码（Java Servlet）：

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.json.JSONObject;

@WebServlet("/bookstore")
public class BookStoreServlet extends HttpServlet {
  private static final long serialVersionUID = 1L;

  protected void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    String action = request.getParameter("action");
    if (action == null) {
      action = "list";
    }
    switch (action) {
      case "list":
        listBooks(request, response);
        break;
      case "details":
        showDetails(request, response);
        break;
      default:
        response.sendError(HttpServletResponse.SC_BAD_REQUEST);
    }
  }

  private void listBooks(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    try {
      Connection conn = getConnection();
      PreparedStatement stmt = conn.prepareStatement("SELECT * FROM books");
      ResultSet rs = stmt.executeQuery();
      List<JSONObject> books = new ArrayList<>();
      while (rs.next()) {
        JSONObject book = new JSONObject();
        book.put("id", rs.getInt("id"));
        book.put("title", rs.getString("title"));
        book.put("author", rs.getString("author"));
        book.put("price", rs.getDouble("price"));
        books.add(book);
      }
      rs.close();
      stmt.close();
      conn.close();
      request.setAttribute("books", books);
      request.getRequestDispatcher("/bookstore.jsp").forward(request, response);
    } catch (SQLException e) {
      throw new ServletException(e);
    }
  }

  private void showDetails(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
    int id = Integer.parseInt(request.getParameter("id"));
    try {
      Connection conn = getConnection();
      PreparedStatement stmt = conn.prepareStatement("SELECT * FROM books WHERE id = ?");
      stmt.setInt(1, id);
      ResultSet rs = stmt.executeQuery();
      if (rs.next()) {
        JSONObject book = new JSONObject();
        book.put("id", rs.getInt("id"));
        book.put("title", rs.getString("title"));
        book.put("author", rs.getString("author"));
        book.put("price", rs.getDouble("price"));
        book.put("description", rs.getString("description"));
        request.setAttribute("book", book);
        request.getRequestDispatcher("/bookdetails.jsp").forward(request, response);
      } else {
        response.sendError(HttpServletResponse.SC_NOT_FOUND);
      }
      rs.close();
      stmt.close();
      conn.close();
    } catch (SQLException e) {
      throw new ServletException(e);
    }
  }

  private Connection getConnection() throws SQLException {
    String url = "jdbc:oracle:thin:@localhost:1521:xe";
    String user = "bookstore";
    String password = "bookstore";
    return DriverManager.getConnection(url, user, password);
  }
}

数据库表结构：

CREATE TABLE books (
  id INTEGER PRIMARY KEY,
  title VARCHAR2(100) NOT NULL,
  author VARCHAR2(50) NOT NULL,
  price NUMBER(6,2) NOT NULL,
  description VARCHAR2(2000) NOT NULL
);

以上代码仅仅提供了一个简单的示例，实际上建立一个完整的网上书店需要更多的代码和细节处理。