diff --git "a/\347\250\213\346\231\237/20220525-2.0.md" "b/\347\250\213\346\231\237/20220525-2.0.md"
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+```PHP
+<?php
+$link=mysqli_connect('127.0.0.1','root','root','student');
+mysqli_query($link,'set names utf8');
+<?php
+include_once ('stoo.php');
+$sql='select * from user order by id';
+$ret=mysqli_query($link,$sql);
+?>
+<html>
+<head>
+    <title>首页</title>
+</head>
+<body>
+<h1>学生管理系统首页</h1>
+<table border="1">
+    <tr>
+        <th>学号</th>
+        <th>姓名</th>
+        <th>年龄</th>
+        <th>地址</th>
+        <th>设置</th>
+    </tr>
+    <?php
+    while($arry=mysqli_fetch_assoc($ret)){
+    ?>
+    <tr>
+        <td><?php echo $arry['id']?></td>
+        <td><?php echo $arry['name']?></td>
+        <td><?php echo $arry['age']?></td>
+        <td><?php echo $arry['address']?></td>
+        <td><a href="set.php?id=<?php echo $arry['id'] ?>">修改</a>| <a href="del.php?id=<?php echo $arry['id'] ?>" >删除</a></td>
+    </tr>
+    <?php
+    }
+    ?>
+</table>
+<a href="add.php">添加学生信息</a>
+</body>
+</html>
+<html>
+<head>
+    <title>添加学生信息</title>
+</head>
+<body>
+<h1>添加学生信息</h1>
+<form action="getadd.php" method="post" name="add">
+    <table border="1" width="250">
+        <tr><th>姓名</th><td><input type="text" name="name" id=""></td></tr>
+        <tr><th>年龄</th><td><input type="text" name="age" id=""></td></tr>
+        <tr><th>地址</th><td><input type="text" name="address" id=""></td></tr>
+        <tr align="center"><td colspan="2"><input type="submit" value="提交" >| <input type="reset" value="重置"></td></tr>
+    </table>
+</form>
+</body>
+</html>
+<?php
+$name = $_POST['name'];
+$age = $_POST['age'];
+$address = $_POST['address'];
+include_once('stoo.php');// 引入数据库配置文件（包含）
+$sql = "insert into `user` value (null,'$name',$age,'$address')";
+$ret = mysqli_query($link, $sql);
+if ($ret) {
+    echo "添加成功<a href='main.php'>返回主页</a>";
+} else {
+    echo "<script>alert('添加失败!');history.go(-1);</script>";
+}
+
+<?php
+include_once ("stoo.php");
+
+$id=$_GET['id'];
+    $sql="select * from`user` where `id` =$id;";
+    $ret=mysqli_query($link,$sql);
+    $arr=mysqli_fetch_assoc($ret);
+    ?>
+    <html>
+    <head>
+        <title> 修改学生信息</title>
+    </head>
+    <body>
+    <form action="getset.php" method="post">
+        <table border="1">
+            <tr><th>学号</th> <td> <?php echo $arr['id'] ?></td> <input value="<?php echo $arr['id'] ?>" hidden name="id" type="text"> </tr>
+            <tr><th>姓名</th><td> <input type="text" name="name" value="<?php echo $arr['name'] ?>"></td> </tr>
+
+            <tr><th>年龄</th><td><input type="text" name="age" value="<?php echo $arr['age'] ?>"></td> </tr>
+            <tr><th>住址</th><td><input type="text" name="address" value="<?php echo $arr['address'] ?>"></td> </tr>
+
+            <tr align="center"> <td colspan="2"><input type="submit" value="提交">  </td></tr>
+
+        </table>
+    </form>
+    </body>
+
+    </html>
+        
+<?php
+$id= $_POST['id'];
+$name = $_POST['name'];
+$age = $_POST['age'];
+$address= $_POST['address'];
+include_once ('stoo.php');
+$sql = "update `user` set `name`='$name',`age`=$age,`address`='$address' where `id`=$id";
+$result = mysqli_query($link,$sql);
+
+if($result){
+    echo "修改成功<a href='main.php'>返回主页</a>";
+}else{
+    echo "<script>alert('修改失败!');history.go(-1);</script>";
+}
+
+<?php
+$id= $_GET['id'];
+include_once ('stoo.php');
+$sql = "delete from `user` where id=$id ";
+//执行语句
+$ret  = mysqli_query($link,$sql);
+// 判断执行是否成功
+if($ret){
+    echo "删除成功<a href='main.php'>返回主页</a>";
+}else{
+    echo "<script>alert('删除失败!');history.go(-1);</script>";
+}
+```
+
