From ca4042ecec0f35fc76f071c0cf05e9bdc8bcbfb4 Mon Sep 17 00:00:00 2001
From: unknown <2576065650@qq.com>
Date: Tue, 24 May 2022 23:25:49 +0800
Subject: [PATCH] d

---
 ...36\345\210\240\346\224\271\346\237\245.md" |  14 ++
 ...37\344\277\241\346\201\257\350\241\250.md" | 220 ++++++++++++++++++
 2 files changed, 234 insertions(+)
 create mode 100644 "\350\246\203\346\270\270/20220524-\345\255\246\347\224\237\344\277\241\346\201\257\350\241\250.md"
diff --git "a/\350\246\203\346\270\270/20220523-MySQL\345\242\236\345\210\240\346\224\271\346\237\245.md" "b/\350\246\203\346\270\270/20220523-MySQL\345\242\236\345\210\240\346\224\271\346\237\245.md"
index 258a74f..387ed5d 100644
--- "a/\350\246\203\346\270\270/20220523-MySQL\345\242\236\345\210\240\346\224\271\346\237\245.md"
+++ "b/\350\246\203\346\270\270/20220523-MySQL\345\242\236\345\210\240\346\224\271\346\237\245.md"
@@ -19,6 +19,20 @@
 
 
 
+### 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
+);
+```
+
+### PHP
+
 ```php
 <?php
 //链接MySQL服务器
diff --git "a/\350\246\203\346\270\270/20220524-\345\255\246\347\224\237\344\277\241\346\201\257\350\241\250.md" "b/\350\246\203\346\270\270/20220524-\345\255\246\347\224\237\344\277\241\346\201\257\350\241\250.md"
new file mode 100644
index 0000000..fdd4c89
--- /dev/null
+++ "b/\350\246\203\346\270\270/20220524-\345\255\246\347\224\237\344\277\241\346\201\257\350\241\250.md"
@@ -0,0 +1,220 @@
+# 作业
+
+### 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
+);
+```
+
+
+
+### index.php
+
+```php
+<?php
+ //建立一个专门用来链接服务器和数据库的文件
+error_reporting(E_ALL^E_WARNING);
+$conn = mysqli_connect("localhost","root","root","student") or die ("连接失败，错误为：".mysqli_connect_errno());
+mysqli_query($conn,"set names utf8");
+```
+
+
+
+### demo.php
+
+```php
+<?php
+include_once ('index.php');
+$sql="select * from `user` ";//把user表里的所有数据查询出来
+$result=mysqli_query($conn,$sql)//执行上面的语句，返回一个结果集
+?>
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>学生信息管理</title>
+</head>
+<body>
+<h1>学生信息首页</h1>
+<table border="1" width="300">
+    <tr>
+        <th>学号</th>
+        <th>姓名</th>
+        <th>成绩</th>
+        <th>操作</th>
+    </tr>
+    <?php
+    //循环之前作个判断，结果是否为空
+    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 $row['id'] ?>">删除</a></td>
+            </tr>
+            <?php
+        }
+    }
+    ?>
+</table>
+<a href="add.php">添加信息</a>
+</body>
+</html>
+```
+
+
+
+### add.php
+
+```php
+<?php
+
+?>
+
+<html>
+<head>
+    <meta charset="utf-8">
+    <title>添加学生信息</title>
+</head>
+
+<h1>添加学生信息</h1>
+<form action="save.php" method="post" >
+<table border="1" width="300">
+
+    <tr>
+        <th>姓名</th><td><input type="text" name="name"></td>
+    </tr>
+
+    <tr>
+        <th>成绩</th><td><input type="text" name="score"></td>
+    </tr>
+    <tr>
+        <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+    </tr>
+</table>
+    <a href="demo.php">返回</a>
+</form>
+
+</html>
+```
+
+
+
+### save.php
+
+```php
+<?php
+include_once ('index.php');//接收表单数据，并提交到数据库
+
+if(!isset($_POST['submit'])){
+    die("非法访问");
+}
+
+$name=$_POST['name'];
+$score=$_POST['score'];
+
+$sql="insert into `user` (`name`,`score`)values ('$name',$score)";
+$result=mysqli_query($conn,$sql);
+if($result){
+    echo "添加成功！<a href='demo.php'>返回首页</a>";
+}else{
+    echo "添加失败！";
+}
+```
+
+
+
+### edit.php
+
+```php
+<?php
+include_once ("index.php");
+if(!isset($_GET['id'])){
+    die("非法访问！");
+}
+$id=$_GET['id'];
+$sql = "select * from `user` where `id`=$id";// 从数据库查询id为$book_id的数据
+$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="300">
+        <tr>
+            <th>姓名</th><td><input type="text" name="name" value="<?php echo $row['name'] ?>"></td>
+        </tr>
+        <tr>
+            <th>成绩</th><td><input type="text" name="score" value="<?php echo $row['score'] ?>"></td>
+        </tr>
+
+        <input type="text" name="id" value="<?php echo $row['id'] ?>" hidden>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp; <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="demo.php">返回</a>
+
+</form>
+</html>
+```
+
+
+
+### update.php
+
+```php
+<?php
+include_once('index.php');
+if(!isset($_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='demo.php'>返回首页</a>";
+}else{
+    echo "修改失败！";
+}
+```
+
+
+
+### delete.php
+
+```php
+<?php
+
+include_once('index.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='demo.php'>返回首页</a>";
+}else{
+    echo "删除失败！";
+}
+```
\ No newline at end of file
-- 
Gitee

