diff --git "a/\346\233\276\351\235\222\345\207\244/20220524-\344\275\234\344\270\232.md" "b/\346\233\276\351\235\222\345\207\244/20220524-\344\275\234\344\270\232.md"
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index 0000000000000000000000000000000000000000..79433cb6a1686d51c22f09d2f53c01292a2efa96
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+```php+HTML
+<?php
+include_once('conn.php');
+$sql = " select * from `user` order by id  ";
+$result=mysqli_query($conn,$sql);
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+        <title>学生管理系统</title>
+
+
+
+
+
+
+
+</head>
+<body>
+<h1>学生管理系统-首页</h1>
+<table border="1" width="600">
+  <tr>
+      <th>学生ID</th>
+      <th>学生姓名</th>
+      <th>学生分数</th>
+      <th>操作</th>
+
+
+  </tr>
+    <?php
+//
+    if (!mysqli_num_rows($result)){
+        echo "<tr align='center'><td colspan='3'>暂无数据</td></tr>";
+    }else{
+        while ($row = mysqli_fetch_assoc($result)){
+     ?>
+    <tr align="center">
+        <td><?php echo $row['id'] ?></td>
+        <td><?php echo $row['name'] ?></td>
+        <td><?php echo $row['score'] ?></td>
+
+
+        <td>
+            <a href="edit.php?id=<?php echo $row['id'] ?>">修改</a>
+            <a href="delete.php?id=<?php echo $row['id'] ?>">删除</a>
+        </td>
+    </tr>
+<?php
+        }
+    }
+?>
+</table>
+ <a href="add.php">添加学生</a>
+</body>
+</html>
+
+
+```
+
+
+
+```php+HTML
+<?php
+?>
+<html>
+<head>
+    <title>添加学生</title>
+
+</head>
+<h1>添加学生</h1>
+<form action="save.php" method="post">
+    <table border="1" width="300">
+
+
+
+        <tr>
+            <th>学生姓名</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>学生分数</th><td><input type="text" score="score"></td>
+        </tr>
+
+
+
+
+
+
+        <tr>
+       <td colspan="2" align="center"><input type="submit" name='submit' value="提交"> <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+```
+
+```php+HTML
+<?php
+/**
+ * 接收表单数据 并提交到数据库
+ */
+//包含数据库连接文件
+include_once('conn.php');
+
+if (!isset($_POST['submit'])){
+    die("非法访问！");
+}
+
+$name=$_POST['name'];//学生姓名
+$score=$_POST['score'];//学生分数
+
+
+
+//定义要执行sql语句
+$sql ="insert into `user`(name,score) values ('name',score)";
+
+
+
+$ret = mysqli_query($conn,$sql);
+if ($ret){
+    echo "添加成功！<a href='index.php'>返回首页</a>";
+}else{
+    echo "添加失败！";
+}
+```
+
+```php+HTML
+<?php
+
+
+include_once("./conn.php");
+if (!isset($_GET['id'])){
+    die("非法访问！");
+}
+$id = $_GET['id'];
+
+$sql = "select * from `user` where `id`=$id";
+$result = mysqli_query($conn,$sql);
+$row = mysqli_fetch_assoc($result);
+?>
+<html>
+<head>
+    <title>修改学生</title>
+
+</head>
+<h1>修改学生</h1>
+<form action="update.php" method="post">
+    <table border="1" width="300">
+
+
+
+        <tr>
+            <th>学生姓名</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>学生分数</th><td><input type="text" score="score"></td>
+        </tr>
+
+
+
+
+
+
+        <input type="text" name="id" value="<?php echo $row[id] ?>" hidden>
+        <tr>
+            <td colspan="2"><input type="submit" name='submit' value="提交"> <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+```
+
+```php+HTML
+<?php
+/**
+ * 接收表单数据。并提交到数据库
+ */
+// 包含数据库连接文件
+include_once('conn.php');
+
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+$id =$_POST['id'];//学号
+$name =$_POST['name'];//学生姓名
+$score =$_POST['score'];//学生分数
+
+
+
+//定义要执行sql语句
+$sql ="update `user` set `name`=`$name`, score=$score
+               where id=$id";
+
+
+
+$ret = mysqli_query($conn,$sql);
+if ($ret){
+    echo "修改成功！<a href='index.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+```
+
+```php+HTML
+<?php
+/** 接收表单数据 并提交到数据库  */
+// 包含数据库连接文件
+
+include_once ('conn.php');
+$id =$_GET['id'];// 得到要删除的学生ID
+
+
+
+
+// 定义要执行sql语句
+$sql = "delete from `user`  where id=$id";
+
+
+$ret = mysqli_query($conn,$sql);
+if ($ret){
+    echo "删除成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "删除失败！";
+}
+```
+
+```php+HTML
+<?php
+/*
+ * 连接服务器和数据库的文件
+ */
+error_reporting(E_ALL ^E_WARNING);
+//连接服务器
+$conn = mysqli_connect('localhost','root','123456','student')or die("连接服务器失败！");
+//设置字符集utf8;
+mysqli_query($conn,'set names utf8');
+```
+
