Exemplu simplu de aplicatie CRUD cu MySQL in Laravel

Curs Php-mysql

In acest tutorial vom crea si testa o aplicatie CRUD simpla cu Laravel (Create-Read-Update-Delete) folosind date stocate intr-o Baza de Date MySQL, folosind clasa DB pentru interogari SQL.
- Acest exemplu il puteti folosi ca punct de inceput pentru un CMS.

• Pentru a descarca fisierele cu codurile prezentate aici, clic pe: Laravel MySQL Exemplu CRUD.

1. Cream un resource controller numit PagesMysql.
Copiati urmatorul cod si salvati-l in "app/Http/Controllers/PagesMysql.php".

<?php
namespace App\Http\Controllers;

use Illuminate\Support\Facades\DB;
use App\Http\Controllers\Controller;
use Illuminate\Http\Request;

//resource controller to Insert, Update, Show, delete pages in mysql
class PagesMysql extends Controller {
 protected $table ='pages';

 //create the table if not exists
 //@return string
 public function createTable(){
 $sql ='CREATE TABLE IF NOT EXISTS '. $this->table .' (id INT UNSIGNED AUTO_INCREMENT PRIMARY KEY, title VARCHAR(100), description VARCHAR(150), content MEDIUMTEXT, dtreg TIMESTAMP NOT NULL DEFAULT NOW()) CHARACTER SET utf8 COLLATE utf8_general_ci';
 if(DB::statement($sql)) return 'Table: '. $this->table .' successfully created.<br><a href="/mysql">Main Page</a>';
 else return 'Unable to create table: '. $this->table;
 }

 //@return view() with list of pages
 public function index(){
 $pages = DB::select('select id, title from '. $this->table);
 return view('pages.index',['title'=>'Pages List', 'pages'=>$pages]);
 }

 //Show the form for creating a new page
 //@return view
 public function create(){
 return view('pages.form_insert', ['title'=>'Create New Page']);
 }

 //Insert /Store a newly created page
 //@return string
 public function store(Request $request){
 $re ='No valid request';
 if($request->has(['title', 'description', 'content'])){
 $sql ='INSERT INTO '. $this->table .' (title, description, content) VALUES (:title, :description, :content)';
 $vals =['title'=>$request->title, 'description'=>$request->description, 'content'=>$request->content];

 if(DB::insert($sql, $vals)){
 $idpg = DB::getPdo()->lastInsertId(); //auto-increment id for newly created page
 $re ='Record inserted successfully.<br><a href="/page/'. $idpg .'">See the page</a>';
 }
 else $re = 'Unable to insert data in table: '. $this->table;
 }
 return $re;
 }

 //Display the specified page
 //@param int $id
 //@return view
 public function show($id){
 $page = DB::select('select title, description, content from '. $this->table .' where id =:id LIMIT 1', ['id'=>$id]);

 //keep data for variables in view
 $page =[
 'title'=>$page[0]->title,
 'description'=>$page[0]->description,
 'content'=>$page[0]->content
 ];
 return view('pages.page', $page);
 }

 //Show the form for editing the specified page
 //@param int $id
 //@return view
 public function edit($id){
 $page = DB::select('select id, title, description, content from '. $this->table .' where id =:id LIMIT 1', ['id'=>$id]);

 //keep data for variables in view
 $page =[
 'title'=>'Edit page',
 'id'=>$page[0]->id,
 'f_title'=>$page[0]->title,
 'f_description'=>$page[0]->description,
 'f_content'=>$page[0]->content
 ];
 return view('pages.form_update', $page);
 }

 //Update the specified resource in storage.
 //@param Request $request
 //@param int $id
 //@return string
 public function update(Request $request, $id){
 $re ='No valid request';
 if($request->has(['title', 'description', 'content'])){
 $sql ='UPDATE '. $this->table .' SET title=:title, description=:description, content=:content WHERE id=:id';
 $vals =['title'=>$request->title, 'description'=>$request->description, 'content'=>$request->content, 'id'=>$id];

 if(DB::update($sql, $vals)){
 $re ='Record updated successfully.<br><a href="/page/'. $id .'">See the page</a>';
 }
 else $re = 'Unable to update data in table: '. $this->table;
 }
 return $re;
 }

 //Remove the specified page
 //@param int $id
 //@return string
 public function destroy($id){
 $nrd = DB::delete('delete from '. $this->table .' where id =:id LIMIT 1', ['id'=>$id]);
 if($nrd >.0) return 'Record deleteed successfully.<br><a href="/mysql">Click Here</a> to go back.';
 else return 'Unable to delete data in table: '. $this->table;
 }
}

2. Creati un director numit "pages" in directorul resources/views/. In directorul "pages/" vom crea cinci fisiere blade template pentru aceasta aplicatie.

a) Creati un template pt. sectiunea <head> a paginilor, in fisierul: resources/views/pages/head.blade.php. Copiati urmatorul cod in acel fisier. Acest fisier va fi inclus in celelalte.

<!doctype html>
<html lang="{{app()->getLocale()}}">
<head>
<meta charset="utf-8">
<title>{{$title}}</title>
</head>
<body>
<h1>{{$title}}</h1>

b) Creati inca un fisier template in: resources/views/pages/index.blade.php si copiati urmatorul cod in acel fisier. Va afisa o pagina cu un link catre formularul de adaugare date in mysql, si o lista cu paginile existente in baza de date.

@include('pages.head')

<a href="{{route('mysql.create')}}" title='Create New Page'>Create New Page</a>
<div id='pages'>
@if($pages && count($pages)>0)
 <ol>
 @foreach($pages as $page)
 <li><a href="/page/{{$page->id}}">{{$page->title}}</a> - <a href="/mysql/{{$page->id}}/edit">Edit</a> - <form method="post" action="/mysql/{{$page->id}}" style='display:inline'>{{ csrf_field() }} {{method_field('DELETE')}} <input type='submit' value='DELETE'/></form></li>
 @endforeach
 </ol>
@endif
</div>

</body>
</html>

c) Acum cream al treilea fisier view in "pages/". Copiati si salvati acest cod in: resources/views/pages/page.blade.php.
- Acest view va arata datele paginii cand e accesata o adresa de forma: 'page/{id}'.

@include('pages.head')

Description: {{$description}}
<h3>Content</h3>
{!!$content !!}
</body>
</html>

d) Creati formularul pentru introducere date in MySQL. Copiati si salvati acest cod in: resources/views/pages/form_insert.blade.php.
- Acest view este returnat cand e accesata pagina: /mysql/create

@include('pages.head')

<form method="post" action="/mysql">
{{ csrf_field() }}

Title: <input type='text' name='title' required /><br>
Description: <input type='text' name='description' /><br>
Content:<br>
<textarea name='content'>Content</textarea><br>
<input type='submit' value='Store'/>
</form>

</body>
</html>

e) Creati formularul pentru update date in MySQL. Copiati si salvati acest cod in: resources/views/pages/form_update.blade.php.
- Acest view este returnat cand e accesata o pagina de forma: /mysql/{id}/edit

@include('pages.head')

<form method="post" action="/mysql/{{$id}}">
{{ csrf_field() }}
{{method_field('PUT')}}

 Title: <input type='text' name='title' value='{{$f_title}}' required /><br>
 Description: <input type='text' name='description' value='{{$f_description}}' /><br>
 Content:<br>
 <textarea name='content'>{!!$f_content!!}</textarea><br>
<input type='submit' value='Update'/>
</form>

</body>
</html>

3. Acum se defineste codul pt. Route care foloseste controller-ul PagesMysql; adaugati urmatorul cod in fisierul routes/web.php:

//calls the method to create the table in mysql
Route::get('mysql/createtable','PagesMysql@createTable');

//on /page/{id} request, calls the method to show page data
Route::get('page/{id}','PagesMysql@show')->where('id', '[0-9]+');

/*
This resource handle multiple requests to Insert, Update, Show, delete pages in mysql
Automatically calls methods according to request
*/
Route::resource('mysql','PagesMysql');

Folosire aplicatie CRUD

Acum puteti folosi aceasta aplicatie simpla CRUD pentru a stoca, edita si sterge date de pagini web in mysql.

1. Mai intai, accesati urmatoarea adresa URL pentru a crea tabelul in baza de date: - Rezultat: 2. Vizitati acest URL (sau apasati pe link-ul "Main Page"): - Rezultatul va aparea precum se vede in imaginea urmatoare:


3. Apasati pe link-ul Create New Page. Va deschide o pagina cu un formular pentru a aduga datele unei noi pagini; cum se vede in aceasta imagine:


4. Adaugati date in campurile formularului, apoi apasati pe butonul "Store" pentru a trimite formularul. Ar trebui sa returneze un raspuns ca acesta: - Daca apasati pe link-ul "See the page", va deschide pagina pe care tocmai ati creat-o.

5. Acum, accesati din nou adresa: - Va afisa un link catre pagina pe care ati creat-o, si butoane Edit si Delete; ca in aceasta imagine:


Acum, puteti crea inca o pagina, sau edita si sterge pagina existenta.

- Daca apasati pe link-ul "Edit", va afisa o pagina cu un formular ca in aceasta imagine:


• Pentru a descarca fisierele cu codurile prezentate aici, apasati pe: Laravel MySQL Exemplu CRUD.

<ul>
 <li>http://coursesweb.net/html/</li>
 <li>http://www.marplo.net/html/</li>
</ul>

.some_class {
  display: list-item;
}

var obj = {
 "courses": ["php", "javascript", "ajax"]
};
var jsonstr = JSON.stringify(obj);
alert(jsonstr);    // {"courses":["php","javascript","ajax"]}

$strhtml = '<body><div id="dv1">CoursesWeb.net</div></body>';
$dochtml = new DOMDocument();
$dochtml->loadHTML($strhtml);
$elm = $dochtml->getElementById("dv1");
echo $elm->nodeValue;    // CoursesWeb.net

I`m living here.
- Traiesc /Locuiesc aici.

Estoy viviendo aquí.
- Traiesc /Locuiesc aici.