diff --git "a/\350\213\217\346\275\207/22020525-\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md" "b/\350\213\217\346\275\207/22020525-\345\255\246\347\224\237\347\256\241\347\220\206\347\263\273\347\273\237.md"
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@@ -0,0 +1,263 @@
+# 作业
+
+mysql
+
+```mysql
+create table user(
+	id int primary key auto_increment,
+	name varchar(30) not null,
+	age int not null,
+	address varchar(200) not null
+);
+```
+
+连接
+
+```php
+<?php
+$link=mysqli_connect('127.0.0.1','root','root','student');
+mysqli_query($link,"set names utf8");
+```
+
+界面
+
+```php
+<?php
+include_once('link.php');
+
+$sql = "select * from user ";
+$ret = mysqli_query($link, $sql);
+?>
+
+<html>
+    <head>
+        <title>学生管理系统</title>
+        <meta charset="utf-8">
+        <script>
+            function del(){
+                if(!window.confirm("确定要删除吗？")){
+                    return false;
+                }
+            }
+        </script>
+    </head>
+
+    <body>
+    <h1>学生管理系统</h1>
+        <table border='2' width='500' >
+                <tr>
+                    <th>编号</th>
+                    <th>姓名</th>
+                    <th>年龄</th>
+                    <th>籍贯</th>
+                    <th>管理</th>
+                </tr>
+            <?php
+                while ($arr = mysqli_fetch_assoc($ret)) {
+                    ?>
+                    <tr align='center'>
+                        <td><?php echo $arr['id'] ?></td>
+                        <td><?php echo $arr['name'] ?></td>
+                        <td><?php echo $arr['age'] ?></td>
+                        <td><?php echo $arr['address'] ?></td>
+                        <td><a href="update.php?id=<?php echo $arr['id'] ?>">修改</a> |
+                            <a href="delete.php?id=<?php echo $arr['id'] ?>" onclick="return del()">删除</a> </td>
+                    </tr>
+                    <?php
+                };
+            ?>
+        </table>
+        <a href="add.php">添加学生数据</a>
+    </body>
+</html>
+```
+
+添加
+
+```html
+<html>
+<head><title>添加系统</title></head>
+<script>
+    function check(){
+        if(add.name.value=='' || add.age.value=='' ||add.address.value==''){
+            alert("内容填写不完整！！");
+            return false;
+        }
+    }
+</script>
+<body>
+<h1>学生添加系统</h1>
+<form action="save.php" name="add" method="post">
+    <table border="1" width="250">
+        <tr>
+            <th>
+                姓名
+            </th>
+            <td>
+                <input type="text" name='name' >
+            </td>
+        </tr>
+
+        <tr>
+            <th>
+                年龄
+            </th>
+            <td>
+                <input type="text" name='age' >
+            </td>
+        </tr>
+
+        <tr>
+            <th>
+                籍贯
+            </th>
+            <td>
+                <input type="text" name='address' >
+            </td>
+        </tr>
+
+        <tr align="center">
+            <td colspan="2">
+                <input type="submit" value="提交"onclick="return check()">
+                <input type="reset" value="重置">
+            </td>
+        </tr>
+    </table>
+
+</form>
+</body>
+</html>
+```
+
+```php
+<?php
+$name=$_POST['name'];
+$age=$_POST['age'];
+$address=$_POST['address'];
+
+include_once ('link.php');
+
+$sql=" insert into `user` value (null,'$name',$age,'$address')";
+
+
+$ret=mysqli_query($link,$sql);
+
+if ($ret){
+    echo "添加成功 <a href='index.php'>返回学生管理系统</a>";
+}else{
+    echo "<script>alert('添加失败');history.go(-1);</script> ";
+}
+```
+
+修改
+
+```html
+<?php
+$id=$_GET['id'];
+
+include_once ('link.php');
+
+$sql="select * from `user` where id='$id' ";
+$ret=mysqli_query($link,$sql);
+$arr=mysqli_fetch_assoc($ret);
+?>
+
+
+
+<html>
+<head><title>修改系统</title></head>
+<body>
+<h1>学生修改系统</h1>
+<form action="update_save.php" name="add" method="post">
+    <table border="1" width="250">
+        <tr>
+            <th>
+                编号
+            </th>
+            <td align="center">
+                <?php echo $arr['id'] ?>
+                <input type="hidden" value="<?php echo $arr['id'] ?>" name="id">
+            </td>
+        </tr>
+
+        <tr>
+            <th>
+                姓名
+            </th>
+            <td align="center">
+                <input type="text" name="name">
+            </td>
+        </tr>
+
+        <tr>
+            <th>
+                年龄
+            </th>
+            <td align="center">
+                <input type="text" name='age' >
+            </td>
+        </tr>
+
+        <tr>
+            <th>
+                籍贯
+            </th>
+            <td align="center">
+                <input type="text" name='address' >
+            </td>
+        </tr>
+
+        <tr align="center">
+            <td colspan="2">
+                <input type="submit" value="提交">
+            </td>
+        </tr>
+    </table>
+
+</form>
+</body>
+</html>
+```
+
+```php
+<?php
+$id=$_POST['id'];
+$name=$_POST['name'];
+$age=$_POST['age'];
+$address=$_POST['address'];
+
+include_once ('link.php');
+
+$sql=" update `user` set `name`='$name',`age`=$age,`address`='$address' where `id`=$id";
+
+
+$ret=mysqli_query($link,$sql);
+
+if ($ret){
+    echo "修改成功 <a href='index.php'>返回学生管理系统</a>";
+}else{
+    echo "<script>alert('修改失败');history.go(-1);</script> ";
+}
+```
+
+删除
+
+```php
+<?php
+$id=$_GET['id'];
+
+
+include_once ('link.php');
+
+$sql="delete from `user` where `id`=$id";
+
+
+$ret=mysqli_query($link,$sql);
+
+if ($ret){
+    echo "删除成功 <a href='index.php'>返回学生管理系统</a>";
+}else{
+    echo "<script>alert('删除失败');history.go(-1);</script> ";
+}
+```
+
