posts<\/code> table with some basic columns in the MySQL database.<\/p>\nCREATE<\/span> TABLE<\/span> `posts<\/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 `content`<\/span> text<\/span> COLLATE utf8_unicode_ci NOT NULL<\/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>\nAUTO-LOADER<\/h2>\n
It always a good idea to autoload the libraries and helpers which are commonly used in the application. Open the config\/autoload.php<\/code> file, specify the library and helper files to autoload.<\/p>\n\r\n$autoload<\/span>[<\/span>'libraries'<\/span>] = array(<\/span>'database'<\/span>, <\/span>'session'<\/span>);<\/span>\r\n$autoload<\/span>[<\/span>'helper'<\/span>] = array(<\/span>'url'<\/span>);<\/span>\r\n<\/pre>\nCreate Model<\/h2>\n
Open the application\/models\/<\/code> directory and create a new file called Post.php<\/code> for Post model. The Post model class has the following methods to handle the database related operations (fetch, insert, update, and delete).<\/p>\n\n- getRows()<\/b> : Fetch all the posts data from the database. If ID given, it returns only the perticular post data.<\/li>\n
- insert()<\/b> : Insert post data into the database.<\/li>\n
- update()<\/b> : Update post data in the database.<\/li>\n
- delete()<\/b> : Delete post data from the database.<\/li>\n<\/ul>\n
<?php <\/span>if ( ! <\/span>defined<\/span>(<\/span>'BASEPATH'<\/span>)) exit(<\/span>'No direct script access allowed'<\/span>);
class <\/span>Post <\/span>extends <\/span>CI_Model<\/span>{
<\/span>\/*
* Get posts
*\/
<\/span>function <\/span>getRows<\/span>(<\/span>$id <\/span>= <\/span>\"\"<\/span>){
if(!empty(<\/span>$id<\/span>)){
<\/span>$query <\/span>= <\/span>$this<\/span>-><\/span>db<\/span>-><\/span>get_where<\/span>(<\/span>'posts'<\/span>, array(<\/span>'id' <\/span>=> <\/span>$id<\/span>));
return <\/span>$query<\/span>-><\/span>row_array<\/span>();
}else{
<\/span>$query <\/span>= <\/span>$this<\/span>-><\/span>db<\/span>-><\/span>get<\/span>(<\/span>'posts'<\/span>);
return <\/span>$query<\/span>-><\/span>result_array<\/span>();
}
}
<\/span>\/*
* Insert post
*\/
<\/span>public function <\/span>insert<\/span>(<\/span>$data <\/span>= array()) {
<\/span>$insert <\/span>= <\/span>$this<\/span>-><\/span>db<\/span>-><\/span>insert<\/span>(<\/span>'posts'<\/span>, <\/span>$data<\/span>);
if(<\/span>$insert<\/span>){
return <\/span>$this<\/span>-><\/span>db<\/span>-><\/span>insert_id<\/span>();
}else{
return <\/span>false<\/span>;
}
}
<\/span>\/*
* Update post
*\/
<\/span>public function <\/span>update<\/span>(<\/span>$data<\/span>, <\/span>$id<\/span>) {
if(!empty(<\/span>$data<\/span>) && !empty(<\/span>$id<\/span>)){
<\/span>$update <\/span>= <\/span>$this<\/span>-><\/span>db<\/span>-><\/span>update<\/span>(<\/span>'posts'<\/span>, <\/span>$data<\/span>, array(<\/span>'id'<\/span>=><\/span>$id<\/span>));
return <\/span>$update<\/span>?<\/span>true<\/span>:<\/span>false<\/span>;
}else{
return <\/span>false<\/span>;
}
}
<\/span>\/*
* Delete post
*\/
<\/span>public function <\/span>delete<\/span>(<\/span>$id<\/span>){
<\/span>$delete <\/span>= <\/span>$this<\/span>-><\/span>db<\/span>-><\/span>delete<\/span>(<\/span>'posts'<\/span>,array(<\/span>'id'<\/span>=><\/span>$id<\/span>));
return <\/span>$delete<\/span>?<\/span>true<\/span>:<\/span>false<\/span>;
}
}<\/span><\/pre>\nCreate Controller<\/h2>\n
Open the application\/controllers\/<\/code> directory and create a new file called Posts.php<\/code> for Posts controller. The Posts controller class has the following methods to perform CRUD operations (view, add, edit, and delete).<\/p>\n\n- __construct()<\/b> : Loads the required library, helper, and model.<\/li>\n
- index()<\/b> :\n
\n- Get status messages from the session.<\/li>\n
- Retrieve posts data from database using getRows() method of Post model.<\/li>\n
- Load post list view.<\/li>\n<\/ul>\n<\/li>\n
- view()<\/b> :\n
\n- Retrieve post data based on the ID using getRows() method of Post model.<\/li>\n
- Load post details view.<\/li>\n<\/ul>\n<\/li>\n
- add()<\/b> :\n
\n- If post submitted, the post data passes to insert() method for insertion.<\/li>\n
- Load post create form view.<\/li>\n<\/ul>\n<\/li>\n
- edit()<\/b> :\n
\n- If post submitted, the post data passes to update() method for update.<\/li>\n
- Load post edit form view.<\/li>\n<\/ul>\n<\/li>\n
- delete()<\/b> : Remove post data using delete() method of Post model.<\/li>\n<\/ul>\n
The CodeIgniter’s form_validation library is used to validate the submitted data on add and edit request.<\/p>\n
<?php <\/span>if ( ! <\/span>defined<\/span>(<\/span>'BASEPATH'<\/span>)) exit(<\/span>'No direct script access allowed'<\/span>);
class <\/span>Posts <\/span>extends <\/span>CI_Controller <\/span>{
function <\/span>__construct<\/span>() {
<\/span>parent<\/span>::<\/span>__construct<\/span>();
<\/span>$this<\/span>-><\/span>load<\/span>-><\/span>helper<\/span>(<\/span>'form'<\/span>);
<\/span>$this<\/span>-><\/span>load<\/span>-><\/span>library<\/span>