php通过query查询两个字段的信息就会无法找到网页
<?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);;?>
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);
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");
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);
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

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics











PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

In PHP, password_hash and password_verify functions should be used to implement secure password hashing, and MD5 or SHA1 should not be used. 1) password_hash generates a hash containing salt values to enhance security. 2) Password_verify verify password and ensure security by comparing hash values. 3) MD5 and SHA1 are vulnerable and lack salt values, and are not suitable for modern password security.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
