diff --git "a/\345\262\221\346\230\245\346\237\263/2022.5.24-PHP\350\277\236\346\216\245\346\225\260\346\215\256\345\272\223.md" "b/\345\262\221\346\230\245\346\237\263/2022.5.23-PHP\350\277\236\346\216\245\346\225\260\346\215\256\345\272\223.md"
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@@ -0,0 +1,191 @@
+```sql
+CREATE DATABASE student CHARSET utf8;
+use student;
+CREATE table user(
+id int PRIMARY key auto_increment,
+name VARCHAR(20) not null,
+score DECIMAL(5,2) not null
+);
+INSERT into user VALUES (1,"陈小龙",98.5),(2,"吴大虫",75.5),(3,"陈得胜",66);
+```
+
+```php
+<?php
+include_once('conn.php');
+$sql = "select * from `bookinfo` order by student_id";
+$result = mysqli_query($conn,$sql);
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>学生信息系统</title>
+    <script>
+        function del(){
+            if(!window.confirm("确定要删除吗？")){
+                return false;
+            }
+        }
+    </script>
+</head>
+<body>
+<h1>学生信息系统-首页</h1>
+<table border="1" width="600">
+    <tr>
+        <th>学生编号</th>
+        <th>学生名称</th>
+        <th>学生成绩</th>
+    </tr>
+<?php
+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['student_id'] ?></td>
+            <td><?php echo $row['student_name'] ?></td>
+            <td><?php echo $row['student_name'] ?></td>
+
+            <td><a href="edit.php?book_id=<?php echo $row['student_id'] ?>">修改</a>|
+                <a href="delete.php?book_id=<?php echo $row['student_id'] ?>" onclick="return del();">删除</a></td>
+        </tr>
+        <?php
+    }
+}
+?>
+</table>
+<a href="add.php">添加学生</a>
+</body>
+</html>
+
+
+```
+
+```php
+<?php
+
+error_reporting(E_ALL ^ E_WARNING);
+
+$conn =mysqli_connect('127.0.0.1','root','root','student') or die("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！");
+}
+
+$student_name=$_POST['student_name'];
+$student_id=$_POST['student_id'];
+$student_score=$_POST['student_score'];
+$sql = "insert into `studentinfo` (student_name,student_id,student_score)
+ values ($student_name,'$student_id','$student_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>
+<head>
+    <title>添加学生</title>
+
+</head>
+<h1>添加学生</h1>
+<form action="save.php" method="post">
+    <table border="1" width="100">
+        <tr>
+            <th>学生编号</th><td><input type="text" name="student_id"></td>
+        </tr>
+        <tr>
+            <th>学生姓名</th><td><input type="text" name="student_name"></td>
+        </tr>
+        <tr>
+            <th>学生成绩</th><td><input type="text" name="student_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
+include_once ("./conn.php");
+if(!isset($_GET['book_id'])){
+    die("非法访问！");
+}
+$book_id=$_GET['student_id'];
+
+$sql = "select * from `studentinfo` where `student_id`=$student_id";
+$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="100">
+        <tr>
+            <th>学生编号</th><td><input type="text" name="student_id" value="<?php echo $row['student_id'] ?>"></td>
+        </tr>
+        <tr>
+            <th>学生姓名</th><td><input type="text" name="student_name" value="<?php echo $row['student_name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>学生成绩</th><td><input type="text" name="student_score" value="<?php echo $row['student_score'] ?>"></td>
+        </tr>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+</form>
+</html>
+                
+                
+<?php               
+include_once('conn.php');
+$book_id=$_GET['student_score'];
+$sql = "delete from `bookinfo` where student_id=$student_id";
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "删除成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "删除失败！";
+}
+
+
+
+<?php
+include_once('conn.php');
+
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+$student_id=$_POST['student_id'];
+$student_name=$_POST['student_name'];
+$student_score=$_POST['student_score'];
+$sql = "update `studentinfo` set `student_id`='$student_id',`student_name`='$student_name',`student_score`='$student_score'";
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "修改成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+```
+
