问一下关于mysqli的store_result()和PDO的fetch_all()的区别解决方法
问一下关于mysqli的store_result()和PDO的fetch_all()的区别
这两个函数的功能都是一次性把结果集取回到本地吧?
那为什么store_result()在教材上写的是可以提高脚本效率,而fetch_all()是不建议使用,因为它的效率低。
为什么两个功能一样的函数,会有这么大不同呢?
谢谢!
------解决方案--------------------
你那是什么教材?
为什么要把不同的东西放在一起比较?
------解决方案--------------------
哪里一样了,PDO的fetchAll()和mysqli的fetch_all()差不多一个功能。都是将结果集全部转换为数组或对象。
但store_result()就是另一回事了:
如果需要对所有记录而不只是一小部分进行处理,可以调用mysqli_stmt对象中的store_result()方法,把所有结果一次全部传回到PHP程序中。这样做不仅更有效率,而且能减轻服务器的负担。store_result()方法是可选的,除了读取数据不改变任何东西。

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

AI Hentai Generator
Generate AI Hentai for free.

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



Recently, during the development of Vue applications, I encountered a common problem: "TypeError: Failedtofetch" error message. This problem occurs when using axios to make HTTP requests and the backend server does not respond to the request correctly. This error message usually indicates that the request cannot reach the server, possibly due to network reasons or the server not responding. What should we do after this error message appears? Here are some workarounds: Check your network connection due to

When writing web applications using PHP, a MySQL database is often used to store data. PHP provides a way to interact with the MySQL database called MySQLi. However, sometimes when using MySQLi, you will encounter an error message, as shown below: PHPFatalerror:Calltoundefinedfunctionmysqli_connect() This error message means that PHP cannot find my

Solution to php unable to connect to mysqli: 1. Open the "php.ini" file; 2. Find "mysqli.reconnect"; 3. Change "mysqli.reconnect = OFF" to "mysqli.reconnect = on".

PDOPDO is an object-oriented database access abstraction layer that provides a unified interface for PHP, allowing you to use the same code to interact with different databases (such as Mysql, postgresql, oracle). PDO hides the complexity of underlying database connections and simplifies database operations. Advantages and Disadvantages Advantages: Unified interface, supports multiple databases, simplifies database operations, reduces development difficulty, provides prepared statements, improves security, supports transaction processing Disadvantages: performance may be slightly lower than native extensions, relies on external libraries, may increase overhead, demo code uses PDO Connect to mysql database: $db=newPDO("mysql:host=localhost;dbnam

If you encounter the following error message when using PHP to connect to a MySQL database: PHPWarning:mysqli_connect():(HY000/2002):Connectionrefused, then you can try to solve this problem by following the steps below. To confirm whether the MySQL service is running normally, you should first check whether the MySQL service is running normally. If the service is not running or fails to start, it may cause a connection refused error. you can

The running file of mysql is mysqld; mysqld is an executable file, which represents the Mysql server program. Executing this file can directly start a server process; and mysqld_safe is a startup script, which will indirectly call mysqld and also start a monitor. process.
![Microsoft Store cannot be opened and displays 'Sorry! Something went wrong, but we got it right' - [Detailed Solution]](https://img.php.cn/upload/article/000/887/227/171151687965989.jpg?x-oss-process=image/resize,m_fill,h_207,w_330)
Some users want to find their favorite apps in the Microsoft Store and download and install them, but find that the Microsoft Store cannot be opened, and it also prompts "Sorry! Something went wrong, but we did it right." So how should we solve it so that it can be opened? Is the Microsoft Store back up and running? The editor has compiled two methods below, I hope they can help you very well! Method one can press Win+R→enter cmd and then hold down ctrl+shift→click OK (click Yes after UAC pops up) and then the cmd window pops up (administrator mode) and then copy and paste the following content: netshwinsockresetnetshintipresetipconfig/releaseipconfig/renewi

How to use MySQLi to establish a database connection in PHP: Include MySQLi extension (require_once) Create connection function (functionconnect_to_db) Call connection function ($conn=connect_to_db()) Execute query ($result=$conn->query()) Close connection ( $conn->close())
