基于HTML+Servlet+JAVAWeb+MYSQL数据库的大麦网（增删改）

由于问题描述不具体，我将提供一个使用Servlet和JDBC操作MySQL数据库的简单示例。假设我们有一个名为douban的数据库表，它有id, name 和 rating 三个字段。

首先，确保你已经添加了MySQL JDBC驱动的依赖到你的项目中。

// DoubanDAO.java
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;
 
public class DoubanDAO {
    private Connection connect = null;
    private PreparedStatement preparedStatement = null;
    private ResultSet resultSet = null;
 
    public DoubanDAO() throws ClassNotFoundException, SQLException {
        Class.forName("com.mysql.cj.jdbc.Driver");
        connect = DriverManager.getConnection("jdbc:mysql://localhost:3306/douban", "username", "password");
    }
 
    public void addMovie(Douban movie) throws SQLException {
        String query = "INSERT INTO douban (name, rating) VALUES (?, ?)";
        preparedStatement = connect.prepareStatement(query);
        preparedStatement.setString(1, movie.getName());
        preparedStatement.setDouble(2, movie.getRating());
        preparedStatement.executeUpdate();
    }
 
    public void updateMovie(Douban movie) throws SQLException {
        String query = "UPDATE douban SET name = ?, rating = ? WHERE id = ?";
        preparedStatement = connect.prepareStatement(query);
        preparedStatement.setString(1, movie.getName());
        preparedStatement.setDouble(2, movie.getRating());
        preparedStatement.setInt(3, movie.getId());
        preparedStatement.executeUpdate();
    }
 
    public void deleteMovie(int id) throws SQLException {
        String query = "DELETE FROM douban WHERE id = ?";
        preparedStatement = connect.prepareStatement(query);
        preparedStatement.setInt(1, id);
        preparedStatement.executeUpdate();
    }
 
    public Douban getMovie(int id) throws SQLException {
        String query = "SELECT * FROM douban WHERE id = ?";
        preparedStatement = connect.prepareStatement(query);
        preparedStatement.setInt(1, id);
        resultSet = preparedStatement.