Eloquent ORM和Query Builder在Laravel中的主要區(qū)別在于操作方式和適用場景。1. Eloquent基于模型，提供面向?qū)ο蟮臄?shù)據(jù)交互方式，適合處理模型邏輯和關系；Query Builder直接操作數(shù)據(jù)庫表，適合快速獲取或操作數(shù)據(jù)。2. Query Builder性能更高，因為它不實例化完整模型對象，適用于大數(shù)據(jù)量或復雜連接；Eloquent適合需要模型功能的場景。3. Eloquent支持定義和使用模型關系（如hasMany、belongsTo），并提供懶加載功能；Query Builder需手動管理連接和相關數(shù)據(jù)。4. 對于復雜的SQL查詢，Query Builder更靈活；Eloquent適合標準的CRUD操作和結(jié)構(gòu)化模型系統(tǒng)。

Eloquent ORM and Query Builder in Laravel serve similar purposes—interacting with your database—but they do it in different ways, and choosing between them depends on what you need to accomplish.

What’s the Main Difference?

Eloquent is an Object-Relational Mapper (ORM). That means it maps your database tables to PHP classes, and rows to instances of those classes. It gives you a more expressive, object-oriented way to work with data.

The Query Builder, on the other hand, provides a fluent interface for creating and running database queries without needing to write raw SQL. It works directly with the database tables, not models.

So if you want to work with model objects and relationships, use Eloquent. If you just need to fetch or manipulate data quickly and efficiently, especially when performance matters or joins get complex, go with Query Builder.

1. Working with Models vs. Raw Tables

Eloquent ORM revolves around models. You define a User model, and from there you can access properties like $user->name, or call methods like User::find(1).

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

This makes it ideal for situations where you want to encapsulate logic inside a model, like formatting attributes or defining relationships.

Query Builder doesn’t care about models. It works directly with tables:

$user = DB::table('users')->where('id', 1)->first();
echo $user->name;

It returns plain stdClass objects, which are fine if you don’t need any model-specific behavior.

Use Eloquent when you want to work with rich model objects and relationships.
Use Query Builder when you just need data and want to avoid overhead.

2. Performance Considerations

Eloquent has some overhead because it builds full model instances. For simple queries or large datasets, that might be unnecessary.

The Query Builder tends to be faster because it doesn’t instantiate full model objects. It’s also better suited for heavy joins or custom SQL constructs.

For example, this query using Eloquent might load extra data:

$orders = Order::with('user')->get();

But if all you need is a list of order IDs and user emails, using Query Builder would be more efficient:

$results = DB::table('orders')
    ->join('users', 'orders.user_id', '=', 'users.id')
    ->select('orders.id', 'users.email')
    ->get();

If performance matters or you’re selecting specific fields, Query Builder may be better.
If you need full model functionality, stick with Eloquent.

3. Relationships and Lazy Loading

One of Eloquent’s biggest strengths is how it handles relationships. You can define a hasMany() or belongsTo() relationship once in your model and then easily access related data:

class User extends Model {
    public function posts() {
        return $this->hasMany(Post::class);
    }
}

$user = User::find(1);
foreach ($user->posts as $post) {
    echo $post->title;
}

The Query Builder doesn’t support relationships natively. You’d have to manually join tables and manage the data yourself.

Lazy loading is another Eloquent feature: it only loads related data when you actually access it. But be careful—it can cause N 1 query issues if used incorrectly.

Use Eloquent when dealing with related data.
Use Query Builder when you're handling joins manually or avoiding eager/lazy loading pitfalls.

4. Flexibility and Custom Queries

Sometimes you need to write complex queries or subqueries that are hard to express using Eloquent’s syntax. In those cases, Query Builder offers more flexibility.

For example, building a union or a nested where clause is often easier with Query Builder:

$users = DB::table('users')
    ->where('votes', '>', 100)
    ->orWhere(function ($query) {
        $query->where('name', 'John')
              ->where('votes', '>', 50);
    })
    ->get();

While Eloquent can handle many advanced scenarios, sometimes the Query Builder feels cleaner and more direct.

Use Query Builder for complex or highly customized SQL.
Use Eloquent for standard CRUD operations and when working within a structured model system.

That’s basically it. Both tools are powerful in their own right, and knowing when to use each will make your Laravel code cleaner and more efficient.

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