PHP框架CodeIgniter入门使用(2)
PHP框架CodeIgniter入门使用(2)
本文参考 链接 介绍CodeIgniter如何将Controller连接Model层(操作数据库),实现读取新闻条目功能。通过本文串通Controller和Model以及View之间如何协同,控制。
一,创建Model
有一点需要明确,关于数据库的操作在model层,而非Controller层,Controller只负责业务控制逻辑,从model里取数据然后送给view。phpmyadmin里:
CREATE TABLE news ( id int(11) NOT NULL AUTO_INCREMENT, title varchar(128) NOT NULL, slug varchar(128) NOT NULL, text text NOT NULL, PRIMARY KEY (id), KEY slug (slug) );
在models文件夹下新建News_model:
load->database(); } public function get_news($slug = FALSE){ if($slug == false){ $query = $this->db->get('news'); return $query->result_array(); } $query = $this->db->get_where('news', array('slug' => slug)); return $query->row_array(); } }
二新建Controller
News.php
load->model(news_model); $this->load->helper('url_helper'); } /** * 显示所有新闻 */ public function index(){ $data['news'] = $this->news_model->get_news(); $data['title'] = 'News archive'; $this->load->view('templates/header', $data); $this->load->view('news/index', $data); $this->load->view('templates/footer'); } /** * 显示某一个slug的新闻 * @param null $slug */ public function view($slug = NULL) { $data['news_item'] = $this->news_model->get_news($slug); if (empty($data['news_item'])) { show_404(); } $data['title'] = $data['news_item']['title']; $this->load->view('templates/header', $data); $this->load->view('news/view', $data); $this->load->view('templates/footer'); } }
1,Controller如何加载Model?
在News的构造函数里通过load->model('')里将model目录下对应名字的model加载进来,然后再使用时通过$this->news_model进行调用。
2,Model的名字是不区分大小写的,即真正的model可以大写,在load的时候可以写成小写。
3,Controller如何跟view层发生关系?
通过$this->load->view('')加载view文件夹下的文件,传递一个array。在Controller里的array的key,在view下就是对应的变量名字。关于传递数据这块可以参考 CI的模版解析类部分。
4,通过代码可以看到,News这个控制器加载了view/news文件夹下的index.php 和view.php
三,新建index.php
>View article
注意:此处用了site_url设置超链接,用意是地址栏里输入news/slug能直接跳转到news/view/slug,因此要设置路由。
view.php
'.$news_item['title'].''; echo $news_item['text'];
四,修改routes.php
在原来基础上,增加以下两句:
$route['news'] = 'news'; $route['news/(:any)'] = 'news/view/$1';
五,配置数据库
在database.php里配置下数据库相关信息。
经过以上5步,一切ok。
浏览器输入:http://localhost/~yanzi/CodeIgniter/index.php/news
点击超链接后http://localhost/~yanzi/CodeIgniter/index.php/news/slug1111 转到以下:

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 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

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

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

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,

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

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

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 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.
