diff --git "a/\346\242\201\346\265\251/20220523-mysql.md" "b/\346\242\201\346\265\251/20220523-mysql.md"
index f1ed0c6cf6d5dc09fb7f89e71f9fa8c647158dd4..8739823d0853567f5f6829dce5a6994f00479cfc 100644
--- "a/\346\242\201\346\265\251/20220523-mysql.md"
+++ "b/\346\242\201\346\265\251/20220523-mysql.md"
@@ -95,7 +95,7 @@ $num = mysqli_affected_rows($a);//返回最近一次query操作受影响的行
 
 if($num==0){
 
-echo "没有对应数据";
+echo "么有受影响的行";
 
 }else if($num<0){
 
@@ -183,7 +183,7 @@ $res_xg = mysqli_query($a,$sql_xg) or die("修改数据失败！错误为：".my
 //查询
 $sql_cx = "select * from `user`";
 $res_cx = mysqli_query($a,$sql_cx) or die("执行错误".mysqli_error($a));
-$all_res =mysqli_fetch_assoc($res_cx);
+
 //打印结果
 while($c=mysqli_fetch_assoc($res_cx)){
     echo $c['id']."|".$c['name']."|".$c['score']."<br>";
diff --git "a/\346\242\201\346\265\251/20220524.md" "b/\346\242\201\346\265\251/20220524.md"
new file mode 100644
index 0000000000000000000000000000000000000000..41aca3438613c31cae43fc2fe0ade3ec7fa228e6
--- /dev/null
+++ "b/\346\242\201\346\265\251/20220524.md"
@@ -0,0 +1,226 @@
+# 作业
+
+```php+HTML
+<?php
+//主页
+error_reporting(E_ALL^E_WARNING);//隐藏除warning以为的错误警告
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','studentt');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+//查询uesr表的全部信息
+$sql="select * from `user` order by id";
+//执行上面的语句，返回一个结果集
+$res =mysqli_query($conn,$sql);
+?>
+
+<html>
+    <head>
+        <meta charset="utf-8">
+        <title>学生成绩表</title>
+    </head>
+    <body>
+    <h1 align="center">学生成绩表</h1>
+    <table border="1" width="600" align="center">
+        <tr align="center">
+            <th>学生编号</th>
+            <th>学生姓名</th>
+            <th>学生成绩</th>
+            <th>操作</th>
+        </tr>
+        <?php
+        //判断上面返回的结果集是否有数据
+            if(!mysqli_num_rows($res)){//结果集为空执行下面语句
+                echo "<tr align='center'><td colspan='5'>没有数据</td></tr>";
+            }else{//否则把结果集转变为关联数组循环输出
+                while($a = mysqli_fetch_assoc($res)){
+        ?>
+        <tr align="center">
+            <td><?php echo $a['id']; ?></td>
+            <td><?php echo $a['name']; ?></td>
+            <td><?php echo $a['score']; ?></td>
+            <td>
+<!--
+在连接路径后面加？表示用get传输
+如  href="./?id=3"表示把id=3用get方式在浏览器的url上传输
+-->
+                <a href="edit.php?id=<?php echo $a['id']; ?>">修改</a>|
+                <a href="delete.php?id=<?php echo $a['id']; ?>">删除</a></td>
+        </tr>
+        <?php
+                }
+            }
+        ?>
+    </table>
+    <p style="text-align: center"><a href="add.php" >添加信息</a></p>
+    </body>
+</html>
+```
+
+```php+HTML
+<?php
+//添加信息
+?>
+<html>
+<head>
+    <title>添加信息</title>
+
+</head>
+<h1>添加学生成绩</h1>
+<!--创建一个表单来收集新加的信息，把收集的信息传给save.php-->
+<form action="save.php" method="post">
+    <table border="1" width="300">
+
+        <tr>
+            <th>学生姓名</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>学生成绩</th><td><input type="text" name="score"></td>
+        </tr>
+
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+```
+
+```php+HTML
+<?php
+//保存添加的信息到数据库
+error_reporting(E_ALL^E_WARNING);//隐藏除warning以为的错误警告
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','studentt');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+//如果不是从添加信息界面里的提交按钮过来的会拒绝访问
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+//从add.php的表单里获取post传输的信息
+$student_name=$_POST['name'];// 姓名
+$student_score=$_POST['score'];// 成绩
+
+
+// 定义要执行sql语句。
+$sql = "insert into `user` (name,score)
+ values ('$student_name','$student_score')";
+//echo $sql;
+// 执行sql语句操作
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "添加成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "添加失败！";
+}
+```
+
+```php+HTML
+<?php
+//修改信息
+error_reporting(E_ALL^E_WARNING);//隐藏除warning以为的错误警告
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','studentt');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+
+$student_id=$_GET['id'];
+//sql语句
+$sql = "select * from `user` where `id`=$student_id";
+//执行sql语句
+$res = mysqli_query($conn,$sql);
+//将查询到的要修改的那行信息转为数组
+$row = mysqli_fetch_assoc($res);
+?>
+
+
+<html>
+<head>
+    <title>修改学生信息</title>
+
+</head>
+<!--创建一个修改信息用的表单,把收集的信息传给update.php-->
+<h1>修改信息</h1>
+<form action="update.php" method="post">
+    <table border="1" width="300">
+        <tr>
+            <th>学生名称</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>学生成绩</th><td><input type="text" name="score" value="<?php echo $row['score'] ?>"></td>
+        </tr>
+        <input type="text" name="id" value="<?php echo $row['id'] ?>" hidden><!--hidden是隐藏这条信息的意思-->
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+```
+
+```php
+<?php
+//保存修改完的信息到数据库
+error_reporting(E_ALL^E_WARNING);//隐藏除warning以为的错误警告
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','studentt');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+
+
+if (!isset($_POST['submit'])) {
+    die("非法访问！");
+}
+//从edit.php界面获取新的信息
+$student_name = $_POST['name'];// 学生姓名
+$student_score= $_POST['score'];// 成绩
+
+// 定义要执行sql语句。
+$sql = "update `user` set `name`='$student_name',score='$student_score'";
+//echo $sql;
+// 执行sql语句操作
+$res = mysqli_query($conn, $sql);
+if ($res) {
+    echo "修改成功！<a href='./index.php'>返回首页</a>";
+} else {
+    echo "修改失败！";
+}
+```
+
+```php
+<?php
+//删除信息
+error_reporting(E_ALL^E_WARNING);//隐藏除warning以为的错误警告
+//连接数据库
+$conn = mysqli_connect
+('127.0.0.1','root','colourdragon','studentt');
+//设置字符集
+mysqli_query($conn,"set names utf8");
+
+
+
+
+//用get得到要删除的学生id
+$student_id = $_GET['id'];
+//创建sql删除语句
+$sql = "delete from `user` where id=$student_id";
+//执行上面的sql语句
+$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！";
+}
+```
+
