Backend DevelopmentPHP ProblemHow does PHP+Mysql implement database addition, deletion, modification and query?How does PHP+Mysql implement database addition, deletion, modification and query?
PHP Mysql method to implement database addition, deletion, modification and query: 1. Create the entry file [index.html] to connect to the database and query data; 2. Click the Add button and add data through [addnews.html]; 3. Click Delete button, delete through the server file [action-del.php].
PHP Mysql method to implement database addition, deletion, modification and query:
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 the database and 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>
<h2 id="新闻后台管理系统">新闻后台管理系统</h2>
<div>
<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 to go through the pageaddnews.htmlAdd data
<!DOCTYPE html>
<html>
<head>
<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>2.2 Create a server file to handle adding newsaction-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 and delete it through the server fileaction-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
<!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>4.2 Through the server file action-editnews.php Modification processing
Modification processing through the server file action-editnews.php
<?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");Related learning recommendations:PHP programming from entry to proficiency
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