安照2-6和2-7课上讲的代码完全写了一遍还是出问题，不知如何是好所以才麻烦老师费点心了
userlist.php 代码 麻烦老师帮看一下运行的时候显示
<?php
header('content-type:text/html;charset=utf-8');
$mysqli = new mysqli('127.0.0.1','root','YOUNI258','books');
if($mysqli->connect_errno){
die($mysqli->connect_error);
}
$mysqli->set_charset('utf8');
$sql="select * from user;";
$mysqli_result=$mysqli->query($sql);
if($mysqli_result && $mysqli_result->num_rows>0){
while($row=$mysqli_result->fetch_assoc()){
$rows[]=$row;
}
}
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html;charset=UTF-8" />
<title>Document</title>
</head>
<h2>用户列表-<a href="adduser.php">添加用户</a></h2>
<body>
<table border="1" cellpadding="0" cellspacing="0" bgcolor="aqua" width="80%">
<tr>
<td>编号</td>
<td>用户名</td>
<td>年龄</td>
<td>操作</td>
</tr>
<?php $i=1; foreach($rows as $row):?>
<tr>
<td><?php echo $i;?></td>
<td><?php echo $row['username'];?></td>
<td><?php echo $row['age'];?></td>
<td><a href="update.php">更新</a>|<a href="deluser.php">删除</a></td>
</tr>
<?php $i++; endforeach;?>
</table>
</body>
</html>adduser.php这个文件的代码
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en"> <head> <meta http-equiv="Content-Type" content="text/html;charset=UTF-8" /> <title>Document</title> </head> <body> <h2>添加用户</h2> <form action="action.php?act=adduser" method="post"> <table border="1" cellpadding="0" cellspacing="0" bgcolor="aquamarine" width="80%"> <tr> <td>用户名</td> <td><input type="text" name="username" id="username" required="required" placeholder="请输入合法用户名" /></td> </tr> <tr> <td>密码</td> <td><input type="password" name="password" id="password" required="required" placeholder="请输入密码" /></td> </tr> <tr> <td>年龄</td> <td><input type="number" name="age" id="age" required="required" placeholder="请输入合法年龄" /></td> </tr> <tr> <td colspan="2"><input type="submit" value="添加用户" /></td> </tr> </table> </form> </body> </html>
这个是action.php的代码
这是action.php运行时出现的错误，我的mysql密码是YOUNI258 帐号是root 数据库是books
这是我数据库的数据
mysql> select * from user;
+----+----------+----------+-----+
| id | username | password | age |
+----+----------+----------+-----+
| 1 | 第一个 | | 18 |
| 2 | 第二个 | | 19 |
| 3 | 第三个 | | 20 |
| 4 | 第四个 | | 21 |
| 5 | 第五个 | | 22 |
| 6 | 第六个 | | 23 |
| 7 | 第七个 | | 24 |
| 8 | 第八个 | | 25 |
| 9 | 第九个 | | 26 |
mysql> desc user;
+----------+---------------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+---------------------+------+-----+---------+----------------+
| id | tinyint(3) unsigned | NO | PRI | NULL | auto_increment |
| username | varchar(20) | NO | | NULL | |
| password | varchar(20) | NO | | NULL | |
| age | tinyint(3) unsigned | NO | | NULL | |
+----------+---------------------+------+-----+---------+----------------++----+----------+----------+-----+
