Collection
Collection
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
<?php
/**实例
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/html" xmlns="http://www.w3.org/1999/html">
<head>
<meta charset="UTF-8">
<title>用户查询</title>
</head>
<body>
<h2>用户查询</h2>
<form action="query.php" method="post">
<label>
<p>用户id:<input type="text" name="id" placeholder="请输入查询的id"></p>
<p><button>提交</button></p>
</label>
</form>
</body>
</html>
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* Created by PhpStorm.
* User: XuanGG
* Date: 2018/6/3
* Time: 22:24
*/
header("Content-Type: text/html; charset=UTF-8");
//创建连接参数: 因为连接参数不会经常变化,所以推荐使用常量
header("Content-Type: text/html; charset=UTF-8");
define ('DB_HOST', 'localhost');
define ('DB_USER', 'root');
define ('DB_PASS', 'root');
define ('DB_NAME', 'php');
define ('DB_CHAR', 'utf8');
$dbc = @mysqli_connect(DB_HOST, DB_USER, DB_PASS, DB_NAME);
//连接失败一定会返回错误编号,可以根据编号判断,也可用 $db是否为false进行判断
if (!mysqli_errno($dbc)) {
echo '1';
}else{echo '连接失败'.mysqli_connect_error($dbc);
}
mysqli_select_db($dbc, DB_NAME); //选择要操作的数据库
mysqli_set_charset($dbc, DB_CHAR); //设置客户端默认字符编码集
实例
<?php
/**
* Created by PhpStorm.
* User: XuanGG
* Date: 2018/6/3
* Time: 22:38
*/
header("Content-Type: text/html; charset=UTF-8");
include('conf1.php');
$id= $_POST['id'];
$sql = "SELECT * FROM `USER` WHERE `user_id`={$id}";
$query =@ mysqli_query($dbc,$sql);
if(mysqli_num_rows($query)==1){
echo '成功';
}
?>
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?>点击 "运行实例" 按钮查看在线实例
query:
