2020-10-07

<%@ page import="java.sql.Statement" %> <%@ page import="static java.time.chrono.JapaneseEra.values" %><%-- Created by IntelliJ IDEA. User: 官方 Date: 2020/10/2 Time: 10:29 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html; charset=UTF-8" language="java"%> <jsp:useBean id="user" class="com.media.bean.User" ></jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% //加载驱动程序 Class.forName("com.mysql.jdbc.Driver"); //建立数据库连接 String url ="jdbc:mysql://127.0.0.1:3306/book?user=root&password=root";//book 为数据库名 Connection connection = DriverManager.getConnection(url);//获得连接对象 alt+ 回车 自动导入类 //创建Statement对象 执行sql语句 Alt+enter 自动引入缺失的类 Statement stmt = connection.createStatement(); //字符串类型的数据插入数据库必须使用单引号 数值类型不用使用单引号 // String sql ="insert into user(username,password,gender,age) values('"+user.getUsername()+"','"+user.getPassword()+"',1,23)"; String sql ="update user set status =3 where id= 27"; //String sql ="delete from user where id = 18"; int count = stmt.executeUpdate(sql); if(count > 0 ){ out.print("更新成功"); }else{ out.print("更新失败"); } %> <jsp:getProperty name="user" property="username"/>