<code>function fetch($query='', $type = 'BOTH') { $result_type="PDO::FETCH_".$type; $query->setFetchMode($result_type);//这报错,$query是pdo的query结果 $result_arr=$query->fetch(); return $result_arr; } </code>
PDOStatement::setFetchMode(): SQLSTATE[HY000]: General error: mode must be an integer
这个是什么问题?本地测试没问题,放空间报错
回复内容:
<code>function fetch($query='', $type = 'BOTH') { $result_type="PDO::FETCH_".$type; $query->setFetchMode($result_type);//这报错,$query是pdo的query结果 $result_arr=$query->fetch(); return $result_arr; } </code>
PDOStatement::setFetchMode(): SQLSTATE[HY000]: General error: mode must be an integer
这个是什么问题?本地测试没问题,放空间报错
no code, no truth.
你得把代码和数据库从你的项目中抽出来并尽量简化,以便于其它人在自己的电脑上重现你遇到的问题,再来分析。
PDO扩展在Windows环境和Linux环境的行为不相同,有的代码在Windows环境是不报错的(warning、notice全打开也不报),但在linux环境就会报错的,我7年前遇到过。
改一行代码:
<code>$query->setFetchMode(constant($result_type)); </code>
PDOStatement::setFetchMode方法必须传入第一个int型的mode参数啊,你肯定没传或者传的不是int型的。至于本地测试没报错,可能是service的错误输出级别跟空间的不一样。
<code>PDOStatement::setFetchMode ( int $mode ); //mode //The fetch mode must be one of the PDO::FETCH_* constants. </code>
一个更好的方法,有图有真相:
你理解错文档的意思了,那是要你填一个PDO的常量,不是字符串。

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

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 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 makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

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.

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.


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