How to create a custom Eloquent query builder for complex database queries



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Creating a custom Eloquent query builder in Laravel can be a powerful way to handle complex database queries. This involves extending the base Eloquent query builder class and adding your own methods for specific query logic. Here's a step-by-step guide:

1. Create a New Eloquent Builder Class:

Create a new PHP file for your custom query builder, for example, CustomQueryBuilder.php. This file should be placed in a location that makes sense in your application structure.

php
// app/QueryBuilders/CustomQueryBuilder.php

namespace App\QueryBuilders;

use Illuminate\Database\Eloquent\Builder;

class CustomQueryBuilder extends Builder
{
    // Your custom methods will go here
}

2. Register the Custom Builder:

In your Eloquent model, override the newEloquentBuilder method to return an instance of your custom query builder.

php
// app/YourModel.php

namespace App;

use App\QueryBuilders\CustomQueryBuilder;

class YourModel extends \Illuminate\Database\Eloquent\Model
{
    protected function newEloquentBuilder($query)
    {
        return new CustomQueryBuilder($query);
    }
}

3. Add Custom Methods:

Now you can add your custom methods to the CustomQueryBuilder class. These methods can encapsulate complex queries or additional logic you need.

php
// app/QueryBuilders/CustomQueryBuilder.php

namespace App\QueryBuilders;

use Illuminate\Database\Eloquent\Builder;

class CustomQueryBuilder extends Builder
{
    public function complexQuery()
    {
        return $this->where('column', '=', 'value')
                    ->orWhere('another_column', '>', 100)
                    // Add your complex query logic here
                    ->orderBy('created_at', 'desc');
    }

    // Add more custom methods as needed
}

4. Use the Custom Builder in Your Code:

Now you can use your custom query builder in your code by calling the methods you defined.

php
$customResults = YourModel::complexQuery()->get();

Additional Resource Links:

Remember to adjust version numbers in the URLs based on the Laravel version you are using. Always refer to the official documentation for the most accurate and up-to-date information.

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