Table of Contents
回复讨论(解决方案)
Home Backend Development PHP Tutorial php通过query查询两个字段的信息就会无法找到网页

php通过query查询两个字段的信息就会无法找到网页

Jun 23, 2016 pm 01:26 PM

<?phpheader("Content-Type:text/html;charset=utf-8");try{$pdo=new pdo('mysql:host=localhost;dbname=lsj','root','lsjhxl123') or die("链接失败");;$pdo->setAttribute(PDO::ATTR_ERRMODE,2);$aa=$pdo->query("set names utf8");//$pdo->exec("insert into test values(2,'bb','cccccc')") or die("失败");$res=$pdo->query("select name from test where id = 11");//修改为查询 name,id两个字段,就错误}catch(PDOException $err){	echo $err->getMessage();}$result=$res->fetchall(PDO::FETCH_ASSOC);print_r($result);;?>
Copy after login


执行这个可以正确得到结果Array ( [0] => Array ( [name] => aa ) )。
但是如果select name from test where id = 11变成select name,id from test where id = 11,,就直接连不上localhost,无法找到网页了


回复讨论(解决方案)

你用ID查询的,还要显示ID.你这个id不是主键?

其它字段呢?只要两个任意字段都有问题?

你用ID查询的,还要显示ID.你这个id不是主键?





其它字段呢?只要两个任意字段都有问题?



没有设置主键,只有select × from test 也是查不出来;
任意单个字段都行,任任意多个字段都不行

试试重新设计下你的表结构。。。你的建表语句拉出来看看

你直接跑sql语句可以吗?不用通过php代码来执行

name id中间是不是误用中文标点了

你这个逗号不对呦

header("Content-Type:text/html;charset=utf-8");try{$pdo=new pdo('mysql:host=localhost;dbname=test','root','root') or die("链接失败");;$pdo->setAttribute(PDO::ATTR_ERRMODE,2);$aa=$pdo->query("set names gbk");//$pdo->exec("insert into test values(2,'bb','cccccc')") or die("失败"); $res=$pdo->query("select id, goodprice from price where id = 15");//修改为查询 name,id两个字段,就错误}catch(PDOException $err){    echo $err->getMessage();} $result=$res->fetchall(PDO::FETCH_ASSOC);print_r($result);
Copy after login
Copy after login


上面的代码你写的代码测试没有问题啊

1.先确定你数据库中是否有id字段。
2.使用这句试,估计你的写法混杂了中文符号。

$res=$pdo->query("select id,name from test where id=11");
Copy after login

header("Content-Type:text/html;charset=utf-8");try{$pdo=new pdo('mysql:host=localhost;dbname=test','root','root') or die("链接失败");;$pdo->setAttribute(PDO::ATTR_ERRMODE,2);$aa=$pdo->query("set names gbk");//$pdo->exec("insert into test values(2,'bb','cccccc')") or die("失败"); $res=$pdo->query("select id, goodprice from price where id = 15");//修改为查询 name,id两个字段,就错误}catch(PDOException $err){    echo $err->getMessage();} $result=$res->fetchall(PDO::FETCH_ASSOC);print_r($result);
Copy after login
Copy after login


上面的代码你写的代码测试没有问题啊



最后也不知道为什么,重装了Apache,php,mysql,最后奇葩的好了
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

Hot AI Tools

Undresser.AI Undress

Undresser.AI Undress

AI-powered app for creating realistic nude photos

AI Clothes Remover

AI Clothes Remover

Online AI tool for removing clothes from photos.

Undress AI Tool

Undress AI Tool

Undress images for free

Clothoff.io

Clothoff.io

AI clothes remover

AI Hentai Generator

AI Hentai Generator

Generate AI Hentai for free.

Hot Article

R.E.P.O. Energy Crystals Explained and What They Do (Yellow Crystal)
2 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Repo: How To Revive Teammates
1 months ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌

Hot Tools

Notepad++7.3.1

Notepad++7.3.1

Easy-to-use and free code editor

SublimeText3 Chinese version

SublimeText3 Chinese version

Chinese version, very easy to use

Zend Studio 13.0.1

Zend Studio 13.0.1

Powerful PHP integrated development environment

Dreamweaver CS6

Dreamweaver CS6

Visual web development tools

SublimeText3 Mac version

SublimeText3 Mac version

God-level code editing software (SublimeText3)

11 Best PHP URL Shortener Scripts (Free and Premium) 11 Best PHP URL Shortener Scripts (Free and Premium) Mar 03, 2025 am 10:49 AM

Long URLs, often cluttered with keywords and tracking parameters, can deter visitors. A URL shortening script offers a solution, creating concise links ideal for social media and other platforms. These scripts are valuable for individual websites a

Working with Flash Session Data in Laravel Working with Flash Session Data in Laravel Mar 12, 2025 pm 05:08 PM

Laravel simplifies handling temporary session data using its intuitive flash methods. This is perfect for displaying brief messages, alerts, or notifications within your application. Data persists only for the subsequent request by default: $request-

Build a React App With a Laravel Back End: Part 2, React Build a React App With a Laravel Back End: Part 2, React Mar 04, 2025 am 09:33 AM

This is the second and final part of the series on building a React application with a Laravel back-end. In the first part of the series, we created a RESTful API using Laravel for a basic product-listing application. In this tutorial, we will be dev

Simplified HTTP Response Mocking in Laravel Tests Simplified HTTP Response Mocking in Laravel Tests Mar 12, 2025 pm 05:09 PM

Laravel provides concise HTTP response simulation syntax, simplifying HTTP interaction testing. This approach significantly reduces code redundancy while making your test simulation more intuitive. The basic implementation provides a variety of response type shortcuts: use Illuminate\Support\Facades\Http; Http::fake([ 'google.com' => 'Hello World', 'github.com' => ['foo' => 'bar'], 'forge.laravel.com' =>

cURL in PHP: How to Use the PHP cURL Extension in REST APIs cURL in PHP: How to Use the PHP cURL Extension in REST APIs Mar 14, 2025 am 11:42 AM

The PHP Client URL (cURL) extension is a powerful tool for developers, enabling seamless interaction with remote servers and REST APIs. By leveraging libcurl, a well-respected multi-protocol file transfer library, PHP cURL facilitates efficient execution of various network protocols, including HTTP, HTTPS, and FTP. This extension offers granular control over HTTP requests, supports multiple concurrent operations, and provides built-in security features.

12 Best PHP Chat Scripts on CodeCanyon 12 Best PHP Chat Scripts on CodeCanyon Mar 13, 2025 pm 12:08 PM

Do you want to provide real-time, instant solutions to your customers' most pressing problems? Live chat lets you have real-time conversations with customers and resolve their problems instantly. It allows you to provide faster service to your custom

Announcement of 2025 PHP Situation Survey Announcement of 2025 PHP Situation Survey Mar 03, 2025 pm 04:20 PM

The 2025 PHP Landscape Survey investigates current PHP development trends. It explores framework usage, deployment methods, and challenges, aiming to provide insights for developers and businesses. The survey anticipates growth in modern PHP versio

Notifications in Laravel Notifications in Laravel Mar 04, 2025 am 09:22 AM

In this article, we're going to explore the notification system in the Laravel web framework. The notification system in Laravel allows you to send notifications to users over different channels. Today, we'll discuss how you can send notifications ov

See all articles