diff --git "a/\345\220\264\351\207\217/20220524--php+mysql\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md" "b/\345\220\264\351\207\217/20220524--php+mysql\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
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index 0000000000000000000000000000000000000000..a3a5ee2be1b4cf16734b009154fb431f53d33d20
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+++ "b/\345\220\264\351\207\217/20220524--php+mysql\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
@@ -0,0 +1,185 @@
+```php
+<?php
+include_once('conn.php');
+$sql = "select * from `student_info` order by stu_id";
+$result = mysqli_query($conn,$sql);
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>学生管理系统</title>
+    <script>
+        function del(){
+            if(!window.confirm("确定要删除吗？")){
+                return false;
+            }
+        }
+    </script>
+</head>
+<body>
+<h1>学生管理系统-首页</h1>
+<table border="1" width="600">
+    <tr>
+        <th>学生编号</th>
+        <th>学生姓名</th>
+        <th>学生分数</th>
+        <th>操作</th>
+    </tr>
+<?php
+if(!mysqli_num_rows($result)) {//
+ echo "<tr align='center'><td colspan='4'>暂无数据！</td></tr>";
+}else {
+    while ($row = mysqli_fetch_assoc($result)) {
+        ?>
+        <tr align="center">
+            <td><?php echo $row['stu_id'] ?></td>
+            <td><?php echo $row['stu_name'] ?></td>
+            <td><?php echo $row['stu_score'] ?></td>
+            <td><a href="edit.php?stu_id=<?php echo $row['stu_id'] ?>">修改</a>|
+                <a href="delete.php?stu_id=<?php echo $row['stu_id'] ?>" onclick="return del();">删除</a></td>
+        </tr>
+        <?php
+    }
+}
+?>
+</table>
+<a href="add.php">添加图书</a>
+</body>
+</html>
+
+```
+
+```php
+<?php
+?>
+<html>
+<head>
+    <title>添加学生</title>
+</head>
+<h1>添加学生</h1>
+<form action="save.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>学生姓名</th><td><input type="text" name="stu_name"></td>
+        </tr>
+        <tr>
+            <th>学生分数</th><td><input type="text" name="stu_score"></td>
+        </tr>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp;
+                <input type="reset" value="取消"></td>
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+</form>
+</html>
+
+```
+
+```php
+<?php
+include_once ("conn.php");
+if(!isset($_GET['stu_id'])){
+    die("非法访问！");
+}
+$stu_id=$_GET['stu_id'];
+$sql = "select * from `student_info` where `stu_id`=$stu_id";// 从数据库查询id为$book_id的数据
+$result = mysqli_query($conn,$sql);
+$row = mysqli_fetch_assoc($result);
+?>
+<html>
+<head>
+    <title>修改学生信息</title>
+</head>
+<h1>修改学生信息</h1>
+<form action="update.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>学生姓名</th><td><input type="text" name="stu_name" value="<?php echo $row['stu_name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>学生分数</th><td><input type="text" name="stu_score" value="<?php echo $row['stu_score'] ?>"></td>
+        </tr>
+        <input type="text" name="stu_id" value="<?php echo $row['stu_id'] ?>" hidden>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp;
+                <input type="reset" value="取消"></td>
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+
+```
+
+```php
+<?php
+include_once('conn.php');
+$stu_id=$_GET['stu_id'];//
+$sql = "delete from `student_info` where stu_id=$stu_id";
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "删除成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+```
+
+```php
+<?php
+
+error_reporting(E_ALL ^ E_WARNING);
+$conn =mysqli_connect('localhost','root','root','student') or die("服务器连接失败！");
+mysqli_query($conn,'set names utf8');
+
+```
+
+```php
+<?php
+include_once('conn.php');
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+$stu_id=$_POST['stu_id'];// 学生id
+$stu_name=$_POST['stu_name'];// 学生姓名
+$stu_score=$_POST['stu_score'];// 学生分数
+$sql = "update `student_info` set `stu_name`='$stu_name',stu_score=$stu_score
+                where stu_id=$stu_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
+<?php
+include_once('conn.php');
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+$stu_name=$_POST['stu_name'];// 姓名
+$stu_score=$_POST['stu_score'];// 分数
+$sql = "insert into `student_info` (stu_name,stu_score)
+ values ('$stu_name',$stu_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！";
+}
+```
+
+```mysql
+CREATE DATABASE student CHARSET utf8;
+use student;
+CREATE table student_info(
+stu_id int PRIMARY key auto_increment,
+stu_name VARCHAR(20) not null,
+stu_score DECIMAL(5,2) not null
+);
+INSERT into student_info VALUES (1,"陈小龙",98.5),(2,"吴大虫",75.5),(3,"陈得胜",66);
+```
+
