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@@ -0,0 +1,318 @@
+# 作业
+
+```php+HTML
+<?php
+session_start();
+$user = $_SESSION['username']?:$_COOKIE['username'];
+if(isset($user)  && $user=="admin"){
+    echo "学生管理系统首页";
+    echo "欢迎您：".$user;
+    echo "很高兴为您服务";
+    echo "<a href='logout.php'>注销</a>";
+}else{
+    echo "你还没有登录！<a href='login.html'>马上去登录</a>";
+}
+
+```
+
+
+
+```html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <title>学生管理系统登录界面</title>
+</head>
+<body>
+<h1>学生管理系统登录界面</h1>
+<form action="login.php" method="post">
+    <table border="0" cellpadding="" cellspacing="">
+        <tr>
+            <td>用户名：</td><td><input type="text" name="username" id=""></td>
+        </tr>
+        <tr>
+            <td>密码：</td><td><input type="password" name="password" id=""></td>
+        </tr>
+        <tr>
+            <td> </td><td><input type="checkbox" name="auto" value="yes">7天内自动登录</td>
+        </tr>
+        <tr>
+            <td><input type="submit" value="登录"></td>
+        </tr>
+    </table>
+</form>
+</body>
+</html>
+```
+
+```php
+<?php
+session_start();
+$username = 'lhq';
+$passwrod = '0303030';
+if($_POST['username']==$username && $_POST['password']==$passwrod){
+    echo "登录成功！";
+    $_SESSION['username']=$username;
+    if($_POST['auto']=='yes'){
+        setcookie('username',"admin",time()+60*60*24*7);
+    }
+    echo "<a href ='index02.php'>返回首页</a>";
+     echo "  ";
+    echo "<a href='index.php'>进入学生管理系统</a>";
+}else{
+    die("登录失败！");
+}
+```
+
+```php+HTML
+<?php
+session_start();
+unset($_SESSION['username']);
+setcookie('username','',time()-1);
+echo "注销成功"<a href='login.html'>重新登录</a>";;
+```
+
+MySQL
+
+```
+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
+);
+```
+
+连接数据库
+
+```
+ar:
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/24
+ * Time: 16:55
+ */
+error_reporting(E_ALL ^ E_WARNING);
+$ar=mysqli_connect('127.0.0.1','root','123456','student');
+mysqli_query($ar,'set names utf8');
+```
+
+首页
+
+```
+index:
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/24
+ * Time: 16:40
+ */
+include_once('ar.php');
+$sql="select*from 'user' ";
+$result = mysqli_query($ar,$sql);
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>学生成绩管理系统</title>
+    <script>
+        function del(){
+            if(!window.confirm("确定删除吗？")){
+                return false;
+            }
+        }
+    </script>
+</head>
+<body>
+<h1>学生成绩管理系统-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>
+        <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($result)) {//
+        echo "<tr align='center'><td colspan='3'>暂无数据！</td></tr>";
+    }else {
+        while ($row = mysqli_fetch_assoc($result)) {
+            ?>
+            <tr align="center">
+                <td><?php echo $row['user_id'] ?></td>
+                <td><?php echo $row['user_name'] ?></td>
+                <td><?php echo $row['user_price'] ?></td>
+                <td><a href="edit.php?user_id=<?php echo $row['user_id'] ?>">修改</a>|
+                    <a href="delete.php?user_id=<?php echo $row['user_id'] ?>" onclick="return del();">删除</a></td>
+            </tr>
+            <?php
+        }
+    }
+    ?>
+</table>
+<a href="add.php">添加学生</a>
+</body>
+</html>
+```
+
+删除
+
+```
+delete
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/24
+ * Time: 17:20
+ */
+include_once('ar.php');
+$user_id=$_GET['user_id'];
+$sql = "delete from `user` where user_id=$user_id";
+$ret = mysqli_query($ar,$sql);
+if($ret){
+    echo "删除成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+```
+
+添加
+
+```
+add:
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/24
+ * Time: 17:19
+ */
+?>
+<html>
+<head>
+    <title>添加学生</title>
+
+</head>
+<h1>添加学生</h1>
+<form action="save.php" method="post">
+    <table border="1" width="300">
+        <!--        <tr>-->
+        <!--            <th>学生编号</th><td><input type="text" name="user_id"></td>-->
+        <!--        </tr>-->
+        <tr>
+            <th>学生名称</th><td><input type="text" name="user_name"></td>
+        </tr>
+        <tr>
+            <th>学生成绩</th><td><input type="text" name="user_score"></td>
+        </tr>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+    </form>
+</html>
+```
+
+修改
+
+```
+edit:
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/24
+ * Time: 17:20
+ */
+include_once("./ar.php");
+if(!isset($_GET['user_id'])){
+    die("非法访问！");
+}
+$user_id=$_GET['user_id'];
+$sql= "select * from `user` where `user_id`=$user_id";
+$result = mysqli_query($ar,$sql);
+$row = mysqli_fetch_assoc($result);
+?>
+<html>
+<head>
+    <title>修改学生</title>
+
+</head>
+<h1>修改学生</h1>
+<form action="update.php" method="post">
+    <table border="1" width="300">
+        <!--        <tr>-->
+        <!--            <th>学生编号</th><td><input type="text" name="user_id"></td>-->
+        <!--        </tr>-->
+        <tr>
+            <th>学生名称</th><td><input type="text" name="user_name" value="<?php echo $row['user_name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>学生成绩</th><td><input type="text" name="user_score" value="<?php echo $row['user_score'] ?>"></td>
+        </tr>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html><?php
+```
+
+更新
+
+```
+update
+<?php
+/**
+ * 
+ */
+include_once('ar.php');
+
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+$user_id=$_POST['user_id'];
+$user_name=$_POST['user_name'];
+$user_score=$_POST['book_price'];
+$sql = "update `user` set `user_name`='$user_name',user_score=$user_score,'   where user_id=$user_id";
+$ret = mysqli_query($ar,$sql);
+if($ret){
+    echo "修改成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+save:
+<?php
+/**
+ * 
+ */
+include_once('ar.php');
+
+if(!isset($_POST['submit'])){
+    die("非法访问！");
+}
+
+$user_name=$_POST['book_name'];
+$user_score=$_POST['user_score'];
+$sql = "insert into `user` (user_name,user_score)
+ values ('$user_name','$user_score')";
+$ret = mysqli_query($ar,$sql);
+if($ret){
+    echo "添加成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "添加失败！";
+}
+    
+```
\ No newline at end of file
