It is not difficult to write Laravel applications using Eloquent ORM. Its core lies in mapping database tables into PHP objects to reduce the writing of original SQL. 1. Create model and migration files can be generated in one click through the Artisan command and define field and table name mappings. 2. The operations of adding, deleting, modifying and searching are concise, and support all, find, where and other methods for querying, and implementing data operations through new, save, and delete. 3. The association model can handle one-to-many and many-to-one relationships, and define posts and user methods in the model to achieve association access. 4. Query scope is used to encapsulate common query conditions, such as defining scopePublished method to only check published articles to improve code reusability and readability. Mastering these four core points can deal with most Laravel development scenarios.
It is actually not difficult to write Laravel applications using Eloquent ORM. It essentially maps database tables and PHP objects, so that you can complete operations such as adding, deleting, modifying and checking without writing too much original SQL. As long as you understand the relationship between the model and the database, you can basically get started.
Create models and migrate files
The first step in using Eloquent in Laravel is to create the model and the corresponding database migration file. You can use the Artisan command to generate it at once:
php artisan make:model Post -mf
This creates a Post model, a migration file, and a factory (used to generate test data). In the migration file, you only need to define fields, such as:
Schema::create('posts', function (Blueprint $table) {
$table->id();
$table->string('title');
$table->text('content');
$table->timestamps();
}); After performing the migration, your database tables are ready. The model will correspond to the plural form of the table name by default (such as Post corresponding to posts ). If your table name is inconsistent, you can add a sentence to the model:
protected $table = 'my_posts';
Basic addition, deletion, modification and search operations
Eloquent provides a very concise way to do basic queries. For example, you want to find all articles:
$posts = Post::all();
Check articles with an ID:
$post = Post::find(1);
For conditional query, you can use where :
$posts = Post::where('title', 'like', '%Laravel%')->get();
Adding new data is also very simple:
$post = new Post(); $post->title = 'My First Post'; $post->content = 'Hello world!'; $post->save();
If you update, check it out first and then change the field to save:
$post = Post::find(1); $post->title = 'Updated Title'; $post->save();
The same goes for deletion:
$post = Post::find(1); $post->delete();
Use the association model to handle relationships
One of the major advantages of Eloquent is that it can easily handle the relationship between tables. For example, if a user has multiple articles, you can define it in the User model:
public function posts()
{
return $this->hasMany(Post::class);
}Then you can pick up the user's articles like this:
$user = User::find(1);
foreach ($user->posts as $post) {
echo $post->title;
}Conversely, if the article belongs to a user, write it in the Post model:
public function user()
{
return $this->belongsTo(User::class);
} In this way, you can directly access data such as $post->user->name .
Simplify common queries with query scope
If you have some common query conditions, such as only searching for published articles, you can define a local scope:
public function scopePublished($query)
{
return $query->where('published', true);
}Then call it directly when using:
$posts = Post::published()->get();
This makes the code clearer and easier to reuse.
Basically that's it. Eloquent has many functions, but the above content can already cover most daily development needs. As long as the model and database structure are in line with each other, it is still easy to use.
The above is the detailed content of How to use Eloquent ORM in Laravel?. For more information, please follow other related articles on the PHP Chinese website!
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