Home Backend Development PHP Problem What should I do if PHP fails to modify database data?

What should I do if PHP fails to modify database data?

Oct 19, 2022 am 09:16 AM
php database

Solution for unsuccessful modification of database data in php: 1. Open the corresponding PHP file; 2. Obtain the user account and password and connect to the database; 3. Use the username variable to modify the data in the data table; 4. View Error message; 5. Check whether $db is connected correctly and modify it; 6. Check whether the table field name involved in sql in the prepare method is incorrect and modify it correctly.

What should I do if PHP fails to modify database data?

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

What should I do if php fails to modify the database data?

Problem description:

PHP cannot modify the database data

I have been stuck in ERROR for a whole day, please help me.
The core error report is as shown in the figure:

What should I do if PHP fails to modify database data?

The complete code is here:

<?php 
header(&#39;Content-Type:textml;charset=utf-8&#39;); $username=&#39;游客&#39;; 
//获取用户输入的账号和密码并连接数据库 
$account=$_POST[&#39;account&#39;]; $password=$_POST[&#39;password&#39;]; 
$db=new mysqli(&#39;localhost&#39;,&#39;root&#39;,&#39;12345678&#39;,&#39;newsmanage&#39;); 
//查询数据库是否已经有相同账号 
$query1=$db->prepare("SELECT account FROM user"); 
$query1->bind_result($theaccount); $query1->execute(); 
while($query1->fetch()) { if ($account == $theaccount) { echo &#39;<script>alert("该账号已被注册!");
location.href="register.html"</script>&#39;; exit(); } } 
//将用户输入的账号和密码写入数据库 
$add=$db->prepare("INSERT INTO user VALUES (null,&#39;general&#39;,null,?,?)"); 
$add->bind_param(&#39;ss&#39;,$account, $password); $add->execute(); 
//数据库对添加的新用户自动生成唯一ID,查寻此ID并赋值变量 
$query2=$db->prepare("SELECT userid FROM user WHERE account=&#39;$account&#39;"); 
$query2->bind_result($userid); $query2->execute(); $query2->fetch(); 
//用username变量修改数据表中的数据 
$edit=$db->prepare("UPDATE user SET username=? WHERE account=?"); 
$edit->bind_param(&#39;ss&#39;,$username,$account); $edit->execute(); 
//报错提示:Call to a member function bind_param() on boolean in echo &#39;<script>alert("恭喜您,注册成功!");
location.href="../login/login.html"</script>&#39;;
Copy after login

Problem analysis:

The error message has made it very clear, saying that you used a member function on a bool value. This error message indicates that your $db->prepare() method failed to execute and returned false instead of the mysqli_stmt object. Please confirm whether $db is connected correctly and whether the table field names involved in the sql in the prepare method are incorrect. and other questions that I can't think of at the moment. . .

Recommended learning: "PHP Video Tutorial"

The above is the detailed content of What should I do if PHP fails to modify database data?. For more information, please follow other related articles on the PHP Chinese website!

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)
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. Best Graphic Settings
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
R.E.P.O. How to Fix Audio if You Can't Hear Anyone
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
WWE 2K25: How To Unlock Everything In MyRise
1 months 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)

PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian Dec 24, 2024 pm 04:42 PM

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

How To Set Up Visual Studio Code (VS Code) for PHP Development How To Set Up Visual Studio Code (VS Code) for PHP Development Dec 20, 2024 am 11:31 AM

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

How do you parse and process HTML/XML in PHP? How do you parse and process HTML/XML in PHP? Feb 07, 2025 am 11:57 AM

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

PHP Program to Count Vowels in a String PHP Program to Count Vowels in a String Feb 07, 2025 pm 12:12 PM

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Explain JSON Web Tokens (JWT) and their use case in PHP APIs. Apr 05, 2025 am 12:04 AM

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

7 PHP Functions I Regret I Didn't Know Before 7 PHP Functions I Regret I Didn't Know Before Nov 13, 2024 am 09:42 AM

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

Explain late static binding in PHP (static::). Explain late static binding in PHP (static::). Apr 03, 2025 am 12:04 AM

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases? Apr 03, 2025 am 12:03 AM

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.

See all articles