diff --git "a/\351\231\210\351\233\205\346\245\240/20220524-\345\255\246\347\224\237\344\277\241\346\201\257\347\256\241\347\220\206\347\263\273\347\273\237\347\275\221\351\241\265\347\211\210.md" "b/\351\231\210\351\233\205\346\245\240/20220524-\345\255\246\347\224\237\344\277\241\346\201\257\347\256\241\347\220\206\347\263\273\347\273\237\347\275\221\351\241\265\347\211\210.md"
new file mode 100644
index 0000000000000000000000000000000000000000..d4650aa65b7b35f4f1d6aa14e696ebd5620be0b1
--- /dev/null
+++ "b/\351\231\210\351\233\205\346\245\240/20220524-\345\255\246\347\224\237\344\277\241\346\201\257\347\256\241\347\220\206\347\263\273\347\273\237\347\275\221\351\241\265\347\211\210.md"
@@ -0,0 +1,214 @@
+```php
+//index.php
+<?php
+include_once('conn.php');// 包含数据库文件
+$sql = "select * from `user` order by id";
+$result = mysqli_query(conn,$sql);//执行上面的语句,返回一个结果集
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>学生信息管理系统</title>
+    <script>
+        function del(){
+            if(!window.confirm("确定要删除吗？")){
+                return false;
+            }
+        }
+    </script>
+</head>
+<body>
+<h1>学生信息管理系统-首页</h1>
+<table border="1" width="600">
+    <tr>
+        <th>学号</th>
+        <th>名字</th>
+        <th>成绩</th>
+        <th>操作</th>
+    </tr>
+<?php
+// 循环之前可以做个判断，结果集是否为空。
+if(!mysqli_num_rows($result)) {//
+ echo "<tr align='center'><td colspan='5'>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 $row['id'] ?>" onclick="return del();">删除</a></td>
+        </tr>
+        <?php
+    }
+}
+?>
+</table>
+<a href="add.php">添加信息</a>
+</body>
+</html>
+
+
+
+//conn.php
+<?php
+/**
+ * 建立一个专门用来连接服务器和数据库的文件
+ */
+error_reporting(E_ALL ^ E_WARNING);
+// 连服务器
+$conn =mysqli_connect('localhost','root','root','students') or die("服务器连接失败！");
+// 设置字符utf8
+mysqli_query($conn,'set names utf8');
+
+
+
+
+//add.php
+<?php
+?>
+<html>
+<head>
+    <title>添加信息</title>
+
+</head>
+<h1>添加信息</h1>
+<form action="save.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>名字</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>成绩</th><td><input type="text" name="score"></td>
+        </tr>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+
+
+
+
+//delete.php
+<?php
+include_once('conn.php');
+$id=$_GET['id'];
+
+
+// 定义要执行sql语句。
+$sql = "delete from `user` where id=$id";
+//echo $sql;
+// 执行sql语句操作
+$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！";
+}
+
+
+
+
+//edit.php
+<?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>修改信息</title>
+
+</head>
+<h1>修改信息</h1>
+<form action="update.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>名字</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>成绩</th><td><input type="text" name="score" value="<?php echo $row['score'] ?>"></td>
+        </tr>
+        <input type="text" name="id" value="<?php echo $row['id'] ?>" hidden>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+
+
+//update.php
+<?php
+include_once('conn.php');
+
+if (!isset($_POST['submit'])) {
+    die("非法访问！");
+}
+$id = $_POST['id'];
+$name = $_POST['name'];
+$score = $_POST['score'];
+
+
+// 定义要执行sql语句。
+$sql = "update `user` set `name`='$name',score=$score  where id=$id";
+//echo $sql;
+// 执行sql语句操作
+$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！";
+}
+
+
+
+
+
+//save.php
+
+<?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 = $_POST['name'];
+$score = $_POST['score'];
+
+
+// 定义要执行sql语句。
+$sql = "insert into `user` (name,score)
+ values ('$name',$score)";
+//echo $sql;
+// 执行sql语句操作
+$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！";
+}
+```
+
