SQL ------ JDBC 删除指定的某条记录

package demo;

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;

/**

 * Servlet implementation class DeleteCustomer

 */

@WebServlet("/delete.do")

public class DeleteCustomer extends HttpServlet {

	private static final long serialVersionUID = 1L;

    /**

     * @see HttpServlet#HttpServlet()

     */

    public DeleteCustomer() {

        super();

        // TODO Auto-generated constructor stub

    }

	/**

	 * @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)

	 */

	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		String CustomerID =request.getParameter("id");//获取浏览器输入的参数

		//设置数据库连接参数

		String url="jdbc:mysql://localhost:3306/库名?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=GMT";

		String user = "用户名";

		String password="密码";

		//加载数据库驱动

		try {

			Class.forName("com.mysql.jdbc.Driver");

		} catch (ClassNotFoundException e) {

			e.printStackTrace();

		}

		try(Connection connection =DriverManager.getConnection(url, user, password)){//连接数据库

			//where一定有指明什么地方

			//sql语句删除记录 where表示条件,customers为表名

			String sql = "delete  from customers where CustomerID= ?;";

	            PreparedStatement statement = connection.prepareStatement(sql);//预处理sql语句

					//填入预处理语句得参数

			        statement.setInt(1, Integer.parseInt(CustomerID));

			        int value = statement.executeUpdate();//executeUpdate执行修改，将修改的个数传给value

			        statement.close();// 关闭statement，释资源

		}catch(SQLException e) {

			e.printStackTrace();

		}

		request.setAttribute("msg", "删除成功！");

		request.getRequestDispatcher("queryalldata.jsp").forward(request, response);//跳转到查询所有得服务程序

	}

}