曾删改“查”

科技2024-03-14 89

<%-- Created by IntelliJ IDEA. User: 给 Date: 2020/10/7 Time: 9:02 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <form action="郝永华home.jsp" method="post"> <input type="text" name="username"> <input type="text" name="password"> <button type="submit">提交</button> </form> </body> </html>

<%@ page import="java.sql.*" %><%-- Created by IntelliJ IDEA. User: 给 Date: 2020/10/7 Time: 8:02 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <% //加载数据库驱动 Class.forName("com.mysql.jdbc.Driver"); //建立数据库连接 String url="jdbc:mysql://localhost:3306/book";//数据库连接地址 Connection connection= DriverManager.getConnection(url,"root","root");//第一个root为数据库的用户名第二个root 为数据库的密码 String sql="select * from user where username=? and password=?";//在 PreparedStatement中使用问号代替实际参数 PreparedStatement ps=connection.prepareStatement(sql); ps.setString(1,request.getParameter("username")); ps.setString(2,request.getParameter("password")); //"insert into user(username,password,gender)values(?,?,?)"; ResultSet rs=ps.executeQuery(); while(rs.next()){ out.print(rs.getString("username")+"-"+rs.getString(3)+"<br>"); } /* //使用Statement对象执行sql语句 Statement stmt=connection.createStatement(); //stme.execteUpdate()执行增改删操作的函数 String sql="select * from user where user "; ResultSet rs=stmt.executeQuery(sql);//执行查询的函数返回结果集 while(rs.next()){ out.print(rs.getString("username")+"-"+rs.getString(3)+"<br>"); } */ %> </body> </html>

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