How to modify sql in php: 1. Connect to the database and query the data; 2. Add data through the page addnews.html; 3. Through "mysql_query("UPDATE news SET title='$title'...) ” statement can be modified to update the data.
The operating environment of this article: Windows 7 system, PHP version 7.1, DELL G3 computer
How to modify sql in php?
PHP Mysql implements database addition, deletion, modification and query
PHP and Mysql can perform simple addition, deletion, modification and query on the database. This article introduces the news Backend management of the list.
Project address
https://github.com/caochangkui/php-mysql-test
Mysql database creation
Create A news list database:
1. Query the database
1.1. Create the file dbconfig.php and save the constants
<?php
define("HOST","localhost");
define("USER","root");
define("PASS","********");
define("DBNAME","news");1.2. Create the entry file index.html (connect to database, query data)
<!DOCTYPE html><html><head>
<meta charset="UTF-8">
<title>新闻后台管理系统</title></head><style type="text/css">.wrapper {width: 1000px;margin: 20px auto;}h2 {text-align: center;}.add {margin-bottom: 20px;}.add a {text-decoration: none;color: #fff;background-color: green;padding: 6px;border-radius: 5px;}td {text-align: center;}</style><body>
<div class="wrapper">
<h2 id="新闻后台管理系统">新闻后台管理系统</h2>
<div class="add">
<a href="addnews.html">增加新闻</a>
</div>
<table width="960" border="1">
<tr>
<th>ID</th>
<th>标题</th>
<th>关键字</th>
<th>作者</th>
<th>发布时间</th>
<th>内容</th>
<th>操作</th>
</tr>
<?php
// 1.导入配置文件
require "dbconfig.php"; // 2. 连接mysql
$link = @mysql_connect(HOST,USER,PASS) or die("提示：数据库连接失败！"); // 选择数据库
mysql_select_db(DBNAME,$link); // 编码设置
mysql_set_charset('utf8',$link); // 3. 从DBNAME中查询到news数据库，返回数据库结果集,并按照addtime降序排列
$sql = 'select * from news order by id asc'; // 结果集
$result = mysql_query($sql,$link); // var_dump($result);die;
// 解析结果集,$row为新闻所有数据，$newsNum为新闻数目
$newsNum=mysql_num_rows($result); for($i=0; $i<$newsNum; $i++){
$row = mysql_fetch_assoc($result); echo "<tr>"; echo "<td>{$row['id']}</td>"; echo "<td>{$row['title']}</td>"; echo "<td>{$row['keywords']}</td>"; echo "<td>{$row['autor']}</td>"; echo "<td>{$row['addtime']}</td>"; echo "<td>{$row['content']}</td>"; echo "<td>
<a href='javascript:del({$row['id']})'>删除</a>
<a href='editnews.php?id={$row['id']}'>修改</a>
</td>"; echo "</tr>";
} // 5. 释放结果集
mysql_free_result($result);
mysql_close($link); ?>
</table>
</div>
<script type="text/javascript">
function del (id) { if (confirm("确定删除这条新闻吗？")){ window.location = "action-del.php?id="+id;
}
} </script></body></html>The page is as shown: 
2. Add news
2.1 Click the Add button , add data through the page addnews.html
nbsp;html>
<meta>
<title>添加新闻</title>
<style>
form{
margin: 20px;
}
</style>
2.2 Create the server-side file action-addnews.php
<?php // 处理增加操作的页面
require "dbconfig.php";
// 连接mysql
$link = @mysql_connect(HOST,USER,PASS) or die("提示：数据库连接失败！");
// 选择数据库
mysql_select_db(DBNAME,$link);
// 编码设置
mysql_set_charset('utf8',$link);
// 获取增加的新闻
$title = $_POST['title'];
$keywords = $_POST['keywords'];
$autor = $_POST['autor'];
$addtime = $_POST['addtime'];
$content = $_POST['content'];
// 插入数据
mysql_query("INSERT INTO news(title,keywords,autor,addtime,content) VALUES ('$title','$keywords','$autor','$addtime','$content')",$link) or die('添加数据出错：'.mysql_error());
header("Location:demo.php");3. Delete news
Click the delete button, Delete through the server-side file action-del.php
<?php // 处理删除操作的页面
require "dbconfig.php";
// 连接mysql
$link = @mysql_connect(HOST,USER,PASS) or die("提示：数据库连接失败！");
// 选择数据库
mysql_select_db(DBNAME,$link);
// 编码设置
mysql_set_charset('utf8',$link);
$id = $_GET['id'];
//删除指定数据
mysql_query("DELETE FROM news WHERE id={$id}",$link) or die('删除数据出错：'.mysql_error());
// 删除完跳转到新闻页
header("Location:demo.php");4. Modify news
4.1 Click the modify button and jump to the file editnews.php for modification
nbsp;html>
<meta>
<title>修改新闻</title>
<?php require "dbconfig.php";
$link = @mysql_connect(HOST,USER,PASS) or die("提示：数据库连接失败！");
mysql_select_db(DBNAME,$link);
mysql_set_charset('utf8',$link);
$id = $_GET['id'];
$sql = mysql_query("SELECT * FROM news WHERE id=$id",$link);
$sql_arr = mysql_fetch_assoc($sql);
?>
4.2 Modify through the server-side file action-editnews.php
Modify through the server-side file action-editnews.php [Recommended learning: "PHP Video Tutorial"]
<?php // 处理编辑操作的页面
require "dbconfig.php";
// 连接mysql
$link = @mysql_connect(HOST,USER,PASS) or die("提示：数据库连接失败！");
// 选择数据库
mysql_select_db(DBNAME,$link);
// 编码设置
mysql_set_charset('utf8',$link);
// 获取修改的新闻
$id = $_POST['id'];
$title = $_POST['title'];
$keywords = $_POST['keywords'];
$autor = $_POST['autor'];
$addtime = $_POST['addtime'];
$content = $_POST['content'];
// 更新数据
mysql_query("UPDATE news SET title='$title',keywords='$keywords',autor='$autor',addtime='$addtime',content='$content' WHERE id=$id",$link) or die('修改数据出错：'.mysql_error());
header("Location:demo.php");The above is the detailed content of How to modify sql in php. For more information, please follow other related articles on the PHP Chinese website!
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