From 17fc185be8b7a36f07ea9df8f5676b2d594e4590 Mon Sep 17 00:00:00 2001
From: unknown <3113368166@qq.com>
Date: Tue, 24 May 2022 22:22:11 +0800
Subject: [PATCH] text

---
 .../20220524\344\275\234\344\270\232.md"      | 229 ++++++++++++++++++
 1 file changed, 229 insertions(+)
 create mode 100644 "\350\260\242\345\250\237/20220524\344\275\234\344\270\232.md"
diff --git "a/\350\260\242\345\250\237/20220524\344\275\234\344\270\232.md" "b/\350\260\242\345\250\237/20220524\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..ecac89e
--- /dev/null
+++ "b/\350\260\242\345\250\237/20220524\344\275\234\344\270\232.md"
@@ -0,0 +1,229 @@
+```mysql
+create database student charset utf8;
+use student;
+create table user(
+id int primary key auto_increment,
+name varchar(20) not null,
+score decimal(3,1) not null
+);
+```
+
+```php
+//conn.php
+<?php
+
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/24
+ * Time: 16:28
+ */
+//先判断错误代码
+error_reporting(E_ALL ^ E_WARNING);
+
+//连接服务器
+$conn = mysqli_connect('localhost', 'root', 'root', 'student') or die("服务器连接失败！");
+
+//设置字符集
+mysqli_query($conn, 'set names utf8');
+```
+
+```php
+//index.php
+<?php
+
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/24
+ * Time: 16:27
+ */
+//包含数据库文件
+include_once ('conn.php');
+
+//把表里所有的数据查出来
+$sql="select * from `user` order by id";
+
+//执行上面的语句，返回一个结果集
+$result=mysqli_query($conn,$sql);
+?>
+
+<html>
+<head>
+<title>学生信息系统</title>
+    <body>
+<h1>学生信息系统</h1>
+<table border="1" width="300">
+    <tr>
+        <th>学生账号</th>
+        <th>姓名</th>
+        <th>成绩</th>
+        <th>操作</th>
+    </tr>
+
+    <?php
+    //循环之前先做判断，结果集是否为空
+    if(!mysqli_num_rows($result)) {//
+        echo "<tr align='center'><td>暂无数据！</td></tr>";
+    }else {
+        while ($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 $row['id'] ?>" onclick="return del();">删除</a></td>
+            </tr>
+            <?php
+        }
+    }
+    ?>
+
+
+</table>
+<a href="add.php">添加学生账户</a>
+</body>
+</head>
+
+</html>
+```
+
+```php
+//add.php
+<?php
+
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/24
+ * Time: 17:03
+ */
+include_once('conn.php');
+?>
+
+<html>
+<head>
+    <title>添加学生账户</title>
+</head>
+<h1>添加学生账户</h1>
+<form action="update.php" method="post"></form>
+<table border="1">
+
+    <tr>
+        <th>学生账号</th>
+        <td><input type="text" name="id"></td>
+    </tr>
+    <th>姓名</th>
+    <td><input type="text" name="name"></td>
+    </tr>
+    <th>成绩</th>
+    <td><input type="text" name="score"></td>
+    </tr>
+    <tr>
+        <td colspan="2" align="center"><input type="submit" name="submit" value="提交">&nbsp;&nbsp;&nbsp;<input
+                type="reset" value="取消"></td>
+    </tr>
+
+
+</table>
+<a href="index.php">返回首页</a>
+
+
+</html>
+```
+
+```php
+//edit.php
+<?php
+include_once ("./conn.php");
+if(!isset($_GET['id'])){
+    die("非法访问！");
+}
+$id=$_GET['id'];
+
+$sql = "select * from `user` where `id`=$id";// 从数据库查询id为$id的数据
+$result = mysqli_query($conn,$sql);
+$row = mysqli_fetch_assoc($result);
+?>
+<html>
+<head>
+    <title>修改数据</title>
+
+</head>
+<h1>修改数据</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 $row['id'] ?>" hidden>
+        <tr>
+            <td colspan="2" align="center"><input type="submit" name='submit' value="提交">&nbsp;&nbsp;&nbsp;&nbsp;
+                <input type="reset" value="取消"></td>
+
+        </tr>
+    </table>
+    <a href="index.php">返回</a>
+
+</form>
+</html>
+```
+
+```php
+//update.php
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Administrator
+ * Date: 2022/5/24
+ * Time: 17:18
+ */
+include_once ('conn.php');
+if (!isset($_POST['submit'])){
+    die("非法访问");
+
+}
+$id=$_POST['id'];//学生账号
+$name=$_POST['name'];//姓名
+$score=$_POST['score']; //成绩
+
+
+//要执行的SQL语句
+$sql="insert into 'user'('id','name','score') values('$id','$name','$score')";
+echo $sql;
+$result=mysqli_query($conn,$sql);
+if ($result){
+    echo "添加成功 <a href='index.php'>返回首页</a>";
+}else
+{
+    echo "添加失败！";
+}
+```
+
+```php
+//delete.php
+<?php
+/**
+ * 接收表单数据。并提交到数据库
+ */
+// 包含数据库连接文件
+
+include_once('conn.php');
+$id=$_GET['id'];//  得到要删除的图书id
+
+
+// 定义要执行sql语句。
+$sql = "delete from `user` where id=$id";
+//echo $sql;
+// 执行sql语句操作
+$ret = mysqli_query($conn,$sql);
+if($ret){
+    echo "删除成功！<a href='./index.php'>返回首页</a>";
+}else{
+    echo "删除失败！";
+}
+```
\ No newline at end of file
-- 
Gitee

