Home php教程 php手册 关于PHP中PDO抽象层,采用rowCount();方法出现返回结果为0的解决

关于PHP中PDO抽象层,采用rowCount();方法出现返回结果为0的解决

Jun 06, 2016 pm 07:45 PM
pdo php about out abstract method use

在学PHP的过程中,遇到一些问题,但不是全部都能够顺利得到解决,就在PDO抽象层,采用rowCount();方法出现数据能够正常查询出来的情况下返回结果为0,在网上搜了一天,没有一个具体的说明和解决方案,很多朋友在问,但却没有人回答,因此在这里稍微说说具体

在学PHP的过程中,遇到一些问题,但不是全部都能够顺利得到解决,就在PDO抽象层,采用rowCount();方法出现数据能够正常查询出来的情况下返回结果为0,在网上搜了一天,没有一个具体的说明和解决方案,很多朋友在问,但却没有人回答,因此在这里稍微说说具体的情况及最终的解决方案,不一定每个人都适用,但是希望能给和我遇到同样问题和在学习中纠结的朋友们一点帮助。

情况描述:

条件:采用$_sql = "SELECT id FROM dda_ddq WHERE name='123' LIMIT 1";语句进行查询,能正常打印出查询的结果集。

症状:利用rowCount();方法在本地能够打印出1,但上传到服务器后打印出0;

经过查询网上资料得出问题原因:

本地测试环境:5.0.51a 

Mysql 5.0.45, PHP 5.2.5 returned 1
在线测试环境:5.1.48

Mysql 5.1.30, PHP 5.1.6 returned 0

看到这里大部分的初级朋友应该明白了为什么本地代码可以正常运行,在线代码就出问题了吧。

解决方法其实非常简单,通过查询PHP5的帮助文档后,采用columnCount();但发现无论有无数据都只返回1值;

最后采用了判断语句的解决方法,勉强能用了,个人感觉应该还有更好的方法,只是我初学还不知道而已;

 if($_st->fetchObject()){
   return "1";
  }else {
   return "";
  }

稍微优化了一下

return $_st->fetchObject() ? 1 : 0;

因此希望能和在PHP学习中的朋友们多多交流。

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
4 weeks ago By 尊渡假赌尊渡假赌尊渡假赌
Hello Kitty Island Adventure: How To Get Giant Seeds
3 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)

CakePHP Project Configuration CakePHP Project Configuration Sep 10, 2024 pm 05:25 PM

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

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

CakePHP Date and Time CakePHP Date and Time Sep 10, 2024 pm 05:27 PM

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

CakePHP File upload CakePHP File upload Sep 10, 2024 pm 05:27 PM

To work on file upload we are going to use the form helper. Here, is an example for file upload.

CakePHP Routing CakePHP Routing Sep 10, 2024 pm 05:25 PM

In this chapter, we are going to learn the following topics related to routing ?

Discuss CakePHP Discuss CakePHP Sep 10, 2024 pm 05:28 PM

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

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

CakePHP Creating Validators CakePHP Creating Validators Sep 10, 2024 pm 05:26 PM

Validator can be created by adding the following two lines in the controller.

See all articles