2020.10.7作业

科技2024-01-20 93

<%@ page import="java.sql.Connection" %> <%@ page import="java.sql.DriverManager" %> <%@ page import="java.sql.Statement" %> <%@ page import="java.sql.ResultSet" %><%-- Created by IntelliJ IDEA. User: 你 Date: 2020/10/7 Time: 8:16 To change this template use File | Settings | File Templates. --%> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>201819101001张佳兴</title> </head> <body> <% //加载数据库驱动 Class.forName("com.mysql.jdbc.Driver"); //建立数据库链接 String url ="jdbc:mysql://localhost:3306/book";//数据库链接地址 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 //使用Statement对象执行sql语句 Statement stmt = connection.createStatement(); //stmt.executeUpdat（）增删改操作的函数 String sql = "select * from 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>

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>201819101001张佳兴</title> </head> <body> <form action="home.jsp" method="post"> <input type="text" name="username"> <input type="text" name="password"> <button type="submit">提交</button> </form> </body> </html>

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>201819101001张佳兴</title> </head> <body> <% //加载数据库驱动 Class.forName("com.mysql.jdbc.Driver"); //建立数据库链接 String url ="jdbc:mysql://localhost:3306/book";//数据库链接地址 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PreparedStatment 中间使用问好代替实际参数 PreparedStatement ps = connection.prepareStatement(sql); ps.setString(1,request.getParameter("username")); ps.setString(2,request.getParameter("password")); 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(); //stmt.executeUpdat（）增删改操作的函数 String sql = "select * from 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>

Processed: 0.016, SQL: 8