JDBC操作数据库之删除数据

1、在show.jsp页面中添加一下代码

<td><a href="DeleteServlet?id=<%=book.getId()%>">删除</a></td>

2、实现删除数据业务功能的Servlet(DeleteServlet.java)

package com.Connection.Test;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

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 com.mysql.jdbc.Driver;

/**
 * Servlet implementation class DeleteServlet
 * 删除数据库books中指定id的图书信息
 */
@WebServlet("/DeleteServlet")
public class DeleteServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public DeleteServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		int id = Integer.valueOf(request.getParameter("id"));
		
		try {
			Class.forName("com.mysql.jdbc.Driver");
			String url = "jdbc:mysql://localhost:3306/test";
			String username = "root";
			String password = "12345";
			
			Connection conn = DriverManager.getConnection(url, username, password);
			String sql = "delete from books where id=?";
			PreparedStatement pstmt = conn.prepareStatement(sql);
			pstmt.setInt(1, id);
			pstmt.executeUpdate();
			
			pstmt.close();
			conn.close();
		} catch (ClassNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		response.sendRedirect("FindServlet");
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		this.doGet(request, response);
	}

}