作业四

<%@ page import="java.sql.Connection" %> <%@ page import="java.sql.Driver" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="javax.swing.plaf.nimbus.State" %> <%@ page import="java.sql.Statement" %> <%@ page import="com.mysql.jdbc.PreparedStatement" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <jsp:useBean id="user" class="com.name.user"></jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% //user对象实例化 //userBean user= new userBean(); //给对象赋值 //user.setUsername(request.getParameter("username")); //user.setPassword(request.getParameter("password")); //数据库操作 //1.加载驱动程序 Class.forName("com.mysql.jdbc.Driver");//报错，说明驱动包没有完成 //建立数据库连接 18.3.22.1 String url ="jdbc:mysql://127.0.0.1:3306/book"; Connection connection = DriverManager.getConnection(url,"book","book"); String sql = "insert into user(username,password,gender,age) values (?,?,?,?)"; PreparedStatement temt = connection.prepareStatement(sql); temt.setString(1,request.getParameter("username")); temt.setString(2,request.getParameter("password")); temt.setString(3,request.getParameter("gender")); temt.setInt(4,request.getParameter("age")); ResultSet rs = temt.executeQuery(); <%@ page import="java.sql.Connection" %> <%@ page import="java.sql.Driver" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="javax.swing.plaf.nimbus.State" %> <%@ page import="java.sql.Statement" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <jsp:useBean id="user" class="com.name.user"> </jsp:useBean> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% Class.forName("com.mysql.jdbc.Driver"); String url ="jdbc:mysql://127.0.0.1:3306/book?user=root&password=root"; Connection connection = DriverManager.getConnection(url); String sql = "insert into user (username,password,gender,age) values ('"+user.getUsername()+"','"+user.getPassword()+"',1,23)"; Statement stmt = connection.createStatement(); int count = stmt.executeUpdate(sql); if(count == 0){ out.print("注册失败"); }else{ out.print("注册成功"); } %> <jsp:setProperty name="user" property="*"></jsp:setProperty> <% //user对象实例化 //userBean user= new userBean(); //给对象赋值 //user.setUsername(request.getParameter("username")); //user.setPassword(request.getParameter("password")); //数据库操作 //1.加载驱动程序 Class.forName("com.mysql.jdbc.Driver");//报错，说明驱动包没有完成 //建立数据库连接 18.3.22.1 String url ="jdbc:mysql://127.0.0.1:3306/book?user=root&password=root"; Connection connection = DriverManager.getConnection(url); //3创建Statement对象 执行sql语句 alt+enter 自动引入缺失的类 Statement stmt = connection.createStatement(); //删除 String sql="delete from user where id = 4 "; int count = stmt.executeUpdate(sql); if(count == 0){ out.print("删除失败"); }else{ out.print("删除成功"); } %>