CodeIgniter provides some built-in helpers to make easy to implement some useful functionality in the web application. Download Helper<\/b> is one of them that lets you integrate file download feature quickly in CodeIgniter. In this CodeIgniter tutorial, we will show you how easily you can download file or image from database<\/b> using Download Helper.<\/p>\n
The Download Helper have a Here we’ll provide an example script to download files or images from database in CodeIgniter<\/b> application. The following functionalities will be implemented in this script.<\/p>\n Create a directory where you want to store the uploaded files. The uploaded files are stored in the To store the files information a table is needed into MySQL database. The following SQL creates a Files controller handles the files listing and download functionality. It contains three functions The File model handles all the database related works and it contains one function force_download()<\/code> function that generates server headers which force data to be downloaded to your computer. You can download existing file from the server using force_download()<\/code> function. The force_download()<\/code> function accepts 3 parameters – $filename<\/code> (string), $data<\/code> (mixed), and $set_mime<\/code> (bool). To download the existing file you’ll need to use the force_download()<\/code> function like the following.<\/p>\nforce_download<\/span>(<\/span>'\/path\/to\/photo.jpg'<\/span>, <\/span>NULL<\/span>);<\/span><\/pre>\n\n
uploads\/files\/<\/code>).<\/li>\nFile Upload Directory<\/h2>\n
uploads\/files<\/code> directory of the application root.<\/p>\nDatabase Table Creation<\/h2>\n
files<\/code> table with some basic required fields.<\/p>\nCREATE<\/span> TABLE<\/span> `files<\/span>` (\r\n `id`<\/span> int<\/span>(11<\/span>) NOT NULL<\/span> AUTO_INCREMENT,\r\n `title`<\/span> varchar<\/span>(255<\/span>) COLLATE utf8_unicode_ci NOT NULL<\/span>,\r\n `file_name`<\/span> varchar<\/span>(255<\/span>) COLLATE utf8_unicode_ci NOT NULL<\/span>,\r\n `created`<\/span> datetime NOT NULL<\/span>,\r\n `modified`<\/span> datetime NOT NULL<\/span>,\r\n `status`<\/span> enum('1'<\/span>,'0'<\/span>) COLLATE utf8_unicode_ci NOT NULL<\/span> DEFAULT '1'<\/span>,\r\n PRIMARY KEY<\/span> (`id`<\/span>)\r\n) ENGINE=<\/span>InnoDB DEFAULT CHARSET=<\/span>utf8 COLLATE=<\/span>utf8_unicode_ci;\r\n<\/pre>\nController (Files.php)<\/h2>\n
__construct()<\/code>, index()<\/code>, and download()<\/code>.
\n__construct()<\/code> – The File model is loaded for fetching files data from the database.
\nindex()<\/code> – The file’s data is fetched from the database using File model and passed to the view.
\ndownload()<\/code> – The requested file is downloaded based on the provided ID from the directory.
\nIn download()<\/code> function, the file information is fetched from the database and force_download()<\/code> is used to download the respective file from the directory.<\/p>\n<?php <\/span>if ( ! <\/span>defined<\/span>(<\/span>'BASEPATH'<\/span>)) exit(<\/span>'No direct script access allowed'<\/span>);
<\/span>\/**
* Files management class created by CodexWorld
*\/
<\/span>class <\/span>Files <\/span>extends <\/span>CI_Controller <\/span>{
function <\/span>__construct<\/span>() {
<\/span>parent<\/span>::<\/span>__construct<\/span>();
<\/span>$this<\/span>-><\/span>load<\/span>-><\/span>model<\/span>(<\/span>'file'<\/span>);
}
public function <\/span>index<\/span>(){
<\/span>$data <\/span>= array();
<\/span>\/\/get files from database
<\/span>$data<\/span>[<\/span>'files'<\/span>] = <\/span>$this<\/span>-><\/span>file<\/span>-><\/span>getRows<\/span>();
<\/span>\/\/load the view
<\/span>$this<\/span>-><\/span>load<\/span>-><\/span>view<\/span>(<\/span>'files\/index'<\/span>, <\/span>$data<\/span>);
}
public function <\/span>download<\/span>(<\/span>$id<\/span>){
if(!empty(<\/span>$id<\/span>)){
<\/span>\/\/load download helper
<\/span>$this<\/span>-><\/span>load<\/span>-><\/span>helper<\/span>(<\/span>'download'<\/span>);
<\/span>\/\/get file info from database
<\/span>$fileInfo <\/span>= <\/span>$this<\/span>-><\/span>file<\/span>-><\/span>getRows<\/span>(array(<\/span>'id' <\/span>=> <\/span>$id<\/span>));
<\/span>\/\/file path
<\/span>$file <\/span>= <\/span>'uploads\/files\/'<\/span>.<\/span>$fileInfo<\/span>[<\/span>'file_name'<\/span>];
<\/span>\/\/download file from directory
<\/span>force_download<\/span>(<\/span>$file<\/span>, <\/span>NULL<\/span>);
}
}
}<\/span><\/pre>\nModel (File.php)<\/h2>\n
getRows()<\/code>. The getRows()<\/code> function get records from the files<\/code> table and returns the requested data.<\/p>\n<?php <\/span>if ( ! <\/span>defined<\/span>(<\/span>'BASEPATH'<\/span>)) exit(<\/span>'No direct script access allowed'<\/span>);
class <\/span>File <\/span>extends <\/span>CI_Model<\/span>{
<\/span>\/*
* get rows from the files table
*\/
<\/span>function <\/span>getRows<\/span>(<\/span>$params <\/span>= array()){
<\/span>$this<\/span>-><\/span>db<\/span>-><\/span>select<\/span>(<\/span>'*'<\/span>);
<\/span>$this<\/span>-><\/span>db<\/span>-><\/span>from<\/span>(<\/span>'files'<\/span>);
<\/span>$this<\/span>-><\/span>db<\/span>-><\/span>where<\/span>(<\/span>'status'<\/span>,<\/span>'1'<\/span>);
<\/span>$this<\/span>-><\/span>db<\/span>-><\/span>order_by<\/span>(<\/span>'created'<\/span>,<\/span>'desc'<\/span>);
if(<\/span>array_key_exists<\/span>(<\/span>'id'<\/span>,<\/span>$params<\/span>) && !empty(<\/span>$params<\/span>[<\/span>'id'<\/span>])){
<\/span>$this<\/span>-><\/span>db<\/span>-><\/span>where<\/span>(<\/span>'id'<\/span>,<\/span>$params<\/span>[<\/span>'id'<\/span>]);
<\/span>\/\/get records
<\/span>$query <\/span>= <\/span>$this<\/span>-><\/span>db<\/span>-><\/span>get<\/span>();
<\/span>$result <\/span>