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.
https://github.com/caochangkui/php-mysql-test
Create A news list database:
<?php
define("HOST","localhost");
define("USER","root");
define("PASS","********");
define("DBNAME","news");<!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>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: 
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>添加新闻</title>
</head>
<style type="text/css">
form{
margin: 20px;
}
</style>
<body>
<form action="action-addnews.php" method="post">
<label>标题：</label><input type="text" name="title">
<label>关键字：</label><input type="text" name="keywords">
<label>作者：</label><input type="text" name="autor">
<label>发布时间：</label><input type="date" name="addtime">
<label>内容：</label><input type="text" name="content">
<input type="submit" value="提交">
</form>
</body>
</html><?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");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");<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>修改新闻</title>
</head>
<body>
<?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);
?>
<form action="action-editnews.php" method="post">
<label>新闻ID: </label><input type="text" name="id" value="<?php echo $sql_arr['id']?>">
<label>标题：</label><input type="text" name="title" value="<?php echo $sql_arr['title']?>">
<label>关键字：</label><input type="text" name="keywords" value="<?php echo $sql_arr['keywords']?>">
<label>作者：</label><input type="text" name="autor" value="<?php echo $sql_arr['autor']?>">
<label>发布时间：</label><input type="date" name="addtime" value="<?php echo $sql_arr['addtime']?>">
<label>内容：</label><input type="text" name="content" value="<?php echo $sql_arr['content']?>">
<input type="submit" value="提交">
</form>
</body>
</html>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());
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