Detailed explanation of addition, deletion, modification and query of laravel framework

Laravel is an excellent PHP framework. Its operation is very simple and elegant, and it can greatly improve development efficiency. In the Laravel framework, common operations are addition, deletion, modification, and search. These operations are introduced in detail below.

1. Data structure design

In Laravel, the definition of data structure is carried out using migration files. We need to first define the fields, types, relationships, etc. of the data table. For example, if we want to define an article table, we can use the following migration file:

Schema::create('articles', function (Blueprint $table) {
    // 自增ID
    $table->increments('id');
    // 文章标题
    $table->string('title');
    // 文章内容
    $table->text('content');
    // 作者ID
    $table->integer('user_id')->unsigned();
    // 创建时间和更新时间
    $table->timestamps();
});

2. Add data

Laravel's data addition operation uses the ORM provided by Eloquent, and you only need to define yourself model, you can easily operate on the database. The following is an example of an article adding operation:

use App\Models\Article;
use App\Models\User;

// 创建一个新的文章
$article = new Article([
    'title' => 'Laravel 增删改查操作',
    'content' => '这篇文章详细介绍了Laravel框架的增删改查操作。',
]);

// 添加一个作者
$author = User::find(1);
$article->author()->associate($author);

// 保存文章
$article->save();

3. Deleting data

Deleting data is also performed using the ORM provided by Eloquent. You only need to define the relevant operations in the model. The following is an example of an article deletion operation:

use App\Models\Article;

// 根据ID查找文章
$article = Article::find(1);

// 删除这篇文章
$article->delete();

4. Modify data

Modifying data also uses the ORM provided by Eloquent. You only need to define the relevant operations in the model. The following is an example of an article modification operation:

use App\Models\Article;
use App\Models\User;

// 根据ID查找文章
$article = Article::find(1);

// 更新文章的标题
$article->title = 'Laravel框架的增删改查操作';

// 添加一个作者
$author = User::find(1);
$article->author()->associate($author);

// 保存文章
$article->save();

5. Query data

Laravel provides a very powerful query syntax, which can easily query data that meets the conditions. The following are some common query operations:

• Find all articles

use App\Models\Article;

$articles = Article::all();

• Find the first article

$article = Article::first();

• Find articles that meet the conditions

$articles = Article::where('title', 'like', '%Laravel%')->orderBy('created_at', 'desc')->get();

• Find articles by a certain author

$user = User::find(1);
$articles = $user->articles;

Summary

This article introduces the common articles in the Laravel framework Add, delete, modify and query operations, and demonstrate the use of these operations through examples. The Laravel framework is simple and elegant in operation, and can greatly improve development efficiency in actual development.

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