Laravel finds the sum of a certain column

Laravel is one of the most popular PHP frameworks currently. It provides many convenient methods that allow developers to complete tasks more efficiently. One of the commonly used functions is to perform sum operations on data in the database. In this article, we will explore how to sum a column using Laravel.

In Laravel, we can use Eloquent for database operations. Eloquent is Laravel's ORM (Object Relational Mapping) module, which can map database tables to object models to facilitate our operations. First, we need to define an Eloquent model in Laravel to map the table we want to operate. Suppose we want to sum a certain column "amount" in the table. The definition model code is as follows:

namespace App;

use IlluminateDatabaseEloquentModel;

class Transaction extends Model
{
    protected $table = 'transactions';
    protected $fillable = ['amount', 'description'];
}

In the above code, we define a model named "Transaction", which corresponds to the database The table is named "transactions". We define the fields in the table that can be batch assigned in the fillable attribute, including "amount" and "description".

Next, we can use the method provided by Eloquent to sum the "amount" column. We can write the following code in the controller:

namespace AppHttpControllers;

use AppTransaction;
use IlluminateHttpRequest;

class TransactionController extends Controller
{
    public function totalAmount()
    {
        $sum = Transaction::sum('amount');
        return view('transactions.total_amount', compact('sum'));
    }
}

In the above code, we use Laravel's dependency injection function to introduce the Request class and Transaction model. We then wrote a method called "totalAmount" that sums the "amount" column by calling the Transaction model's sum method. Finally, we pass the summation result to the view file "transactions.total_amount" for display.

Finally, we need to define a route in the routing file to access this method. Assuming that we want to bind this method to the route "/transactions/total-amount", we can add the following code in routes/web.php:

Route::get('/transactions/total-amount', 'TransactionController@totalAmount');

Now, we visit the URL "http" in the browser ://yourdomain.com/transactions/total-amount" to view the total of the "amount" column.

To summarize, Laravel provides a very convenient way to perform sum operations on data in the database. We can easily achieve this by just using the sum method of the Eloquent model.

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