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+##### 主页
+
+```php
+<?php
+include_once('conn.php');
+
+
+$sql = "select * from `user`";
+$result = mysqli_query($conn,$sql);
+?>
+
+<html>
+<head>
+    <meta charset="utf8">
+    <title>学生信息表</title>
+    <script>
+        function del() {
+            if (!window.confirm("确定要删除吗？")) {
+                return false;
+            }
+        }
+    </script>
+</head>
+<body>
+<h1>学生信息表-首页</h1>
+<table border="1" width="300">
+    <tr>
+        <th>学号</th>
+        <th>姓名</th>
+        <th>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['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 $row['id'] ?>" onclick="return del();">删除</a></td>
+            </tr>
+            <?php
+        }
+    }
+    ?>
+</table>
+<a href="add.php">添加学生信息</a>
+</body>
+</html>
+```
+
+##### 添加
+
+##### add文件
+
+```php
+<?php
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>添加学生信息</title>
+</head>
+<h1>添加学生信息</h1>
+<form action="save.php" method="post">
+    <table border="1" width="100">
+        <tr>
+            <th>姓名</th><td><input type="text" name="name"></td>
+        </tr>
+        <tr>
+            <th>分数</th><td><input type="text" name="score"></td>
+        </tr>
+        <tr>
+            <td colspan="4" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+
+    </table>
+    <a href="demo02.php">返回</a>
+
+</form>
+
+</html>
+```
+
+##### save
+
+```php
+<?php
+
+include_once('conn.php');
+
+if (!isset($_POST['submit'])){
+    die("非法访问!");
+}
+
+
+$name=$_POST['name'];
+$score=$_POST['score'];
+
+$sql="insert `user`  (`name`,`score`) values ('$name',$score)";
+$result = mysqli_query($conn,$sql);
+if ($result){
+    echo "添加成功！<a href='./demo02.php'>返回首页</a>";
+}else{
+    "添加失败!";
+}
+```
+
+#####  修改数据
+
+##### edit文件
+
+```php
+<?php
+include_once ("conn.php");
+if (!isset($_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>修改学生信息</title>
+</head>
+<h1>修改学生信息</h1>
+<form action="update.php" method="post">
+    <table border="1" width="100">
+        <tr>
+            <th>姓名</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>分数</th><td><input type="text" name="score"  value="<?php echo $row['score'] ?>"></td>
+        </tr>
+        <input type="text" name="id" value="<?php echo $row['id'] ?>" hidden>
+        <tr>
+            <td colspan="4" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+
+    </table>
+    <a href="demo02.php">返回</a>
+
+</form>
+</html>
+```
+
+##### update
+
+```php
+<?php
+
+
+include_once('conn.php');
+
+if (!isset($_POST['submit'])){
+    die("非法访问!");
+}
+
+$id=$_POST['id'];
+$name=$_POST['name'];
+$score=$_POST['score'];
+
+$sql="update `user` set 'name'='$name',score=$score where id=$id";
+$ret = mysqli_query($conn,$sql);
+if ($ret){
+    echo "修改成功！<a href='./demo02.php'>返回首页</a>";
+}else{
+    "修改失败!";
+}
+```
+
+#####  删除数据
+
+##### delete文件
+
+```php
+<?php
+include_once('conn.php');
+$id=$_GET['id'];
+$sql = "delete from `user` where id=$id";
+$ret = mysqli_query($conn,$sql);
+if ($ret){
+    echo "删除成功！<a href='demo02.php'>返回首页</a>";
+}else{
+    echo "删除失败!";
+}
+```
+
+##### 链接mysql文件
+
+```php
+<?php
+
+error_reporting(E_ALL ^ E_WARNING);
+//连接服务器和数据库文件
+$conn = mysqli_connect("localhost","root","root","student") or die("服务器连接失败!");
+//字符集
+mysqli_query($conn,'set names utf8');
+```
+
+##### mysql
+
+```mysql
+create database student charset utf8;
+use student;
+
+CREATE TABLE user(
+id int PRIMARY KEY auto_increment,
+name VARCHAR(20) not null,
+score decimal not null
+);
+```
+
