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+![2022-5-23 10-41-39](https://tva1.sinaimg.cn/large/e6c9d24egy1h2jp8ryl3wj218g0p0q5o.jpg)
+
+```php
+//连接数据库 文件名：sjkxx
+<?php
+error_reporting(  E_ALL ^ E_WARNING);
+$a=mysqli_connect(localhost,root,root,student )
+or die("连接失败，错误：".mysqli_connect_error());
+mysqli_query($a,'set names utf8');
+
+```
+
+
+
+```php
+//页面首页  文件名：xsxxsy
+
+<?php
+include_once('sjkxx.php');
+$sql = "select * from user order by id";
+$result = mysqli_query($a,$sql);
+?>
+
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>学生信息管理系统</title>
+    <script>
+        function del(){
+            if (!window.confirm("确定删除？")){
+                return false;
+            }
+        }
+    </script>
+</head>
+<body>
+<h1>学生信息管理首页</h1>
+<table border="1" width="600">
+    <tr>
+        <th>学生编号</th>
+        <th>学生姓名</th>
+        <th>学生成绩</th>
+        <th>操作</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['id'] ?></td>
+                <td><?php echo $row['name'] ?></td>
+                <td><?php echo $row['score'] ?></td>
+                <td><a href="xg.php?id=<?php echo $row['id'] ?>">修改</a>|
+                    <a href="sc.php?id=<?php echo $row['id'] ?>" onclick="return del();">删除</a>
+                </td>
+            </tr>
+            <?php
+        }
+    }
+    ?>
+</table>
+<a href="tj.php">添加学生信息</a>
+</body>
+</html>
+```
+
+```php
+//添加页面  文件名：tj
+<?php
+
+?>
+
+<html>
+    <head>
+        <title>添加学生信息</title>
+    </head>
+    <body>
+    <h1>添加学生信息</h1>
+    <form action="tj1.php" method="post">
+        <table border="1" width="300">
+            <tr>
+                <th>学生姓名</th><td><input type="text" name="name"></td>
+            </tr>
+            <tr>
+                <th>成绩</th><td><input type="text" name="score"></td>
+            </tr>
+            <tr>
+                <td colspan="2" align="center"><input type="submit" name='submit' value="提交"> &nbsp;&nbsp;
+                    &nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+            </tr>
+        </table>
+        <a href="./xsxxsy.php">返回</a>
+    </body>
+</html>
+```
+
+```php
+//添加  文件名：tj1
+<?php
+include_once('sjkxx.php');
+if(!isset($_POST['submit'])){
+    die("错误途径！");
+}
+$name=$_POST['name'];
+$score=$_POST['score'];
+$sql = "insert into user (name,score)
+ values ('$name',$score)";
+$ret = mysqli_query($a,$sql);
+if($ret){
+    echo "添加成功！<a href='./xsxxsy.php'>返回首页</a>";
+}else{
+    echo "添加失败！";
+}
+```
+
+```php
+//修改页面  文件名：xg
+<?php
+include_once ("sjkxx.php");
+if(!isset($_GET['id'])){
+    die("错误途径！");
+}
+$id=$_GET['id'];
+$sql = "select * from user where id=$id";
+$result = mysqli_query($a,$sql);
+$row = mysqli_fetch_assoc($result);
+?>
+
+<html>
+    <head>
+        <title>修改学生信息</title>
+    </head>
+    <body>
+    <h1>修改学生信息</h1>
+    <form action="xg1.php" method="post">
+        <table border="1" width="300">
+            <tr>
+                <th>图书名称</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+            </tr>
+            <tr>
+                <th>图书价格</th><td><input type="text" name="score" value="<?php echo $row['score'] ?>"></td>
+            </tr>
+            <input type="text" name="id" value="<?php echo $row['id'] ?>" hidden>
+            <tr>
+                <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;
+                    &nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消">
+                </td>
+            </tr>
+        </table>
+        <a href="./xsxxsy.php">返回</a>
+    </body>
+</html>
+```
+
+```php
+//修改  文件名：xg1
+<?php
+include_once('sjkxx.php');
+if(!isset($_POST['submit'])){
+    die("错误途径！");
+}
+$id=$_POST['id'];
+$name=$_POST['name'];
+$score=$_POST['score'];
+$sql = "update user set name='$name',score=$score where id=$id";
+$ret = mysqli_query($a,$sql);
+if($ret){
+    echo "修改成功！<a href='./xsxxsy.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+```
+
+```php
+//删除  文件名：sc
+<?php
+include_once('sjkxx.php');
+$id=$_GET['id'];
+$sql = "delete from user where id=$id";
+$ret = mysqli_query($a,$sql);
+if($ret){
+    echo "删除成功！<a href='xsxxsy.php'>返回首页</a>";
+}else{
+    echo "删除失败！";
+}
+
+```
+
