Truncate a table in Laravel 5

问题:

Description : I have a table full of tested data. Sometimes, I want to clear it out for new data. I can perform the truncate in the DBMS App like MySQL WorkBench, but I'm trying to achieve it within my application instead.

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Goal : to make a button to truncate a table in a database when on click.

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Here are my steps :

1 - Declare a route

Route::delete('visitor/truncate',array('as'=>'visitor.truncate', 'uses'=>'VisitorController@truncate'));

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2 - Create a truncate function in my VisitorController

public function truncate()
{

    $visitors = Visitor::all();
    $visitors ->truncate();

    return View::make('visitors.index')
        ->with('success', 'Truncate Done');
}

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3 - Create a button on my view

 {!! Form::model($visitors, array( 'route' => array('visitor.truncate'),'method' => 'DELETE')) !!}
          <button type="submit"  class="btn bgm-red btn-float waves-effect waves-effect waves-button waves-float"><i class="md md-remove"></i></button>
      {!! Form::close()!!}

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4 - Test

When I click on it, it get into my truncate() function in my controller, but I keep getting this error

Call to undefined method Illuminate\Database\Eloquent\Collection::truncate()

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Do I need include anything to use truncate() ?

Any hints on that will be much appreciated !

回答1:

The truncate method is part of the Query Builder. However Visitor::all() returns a Collection instance. You need to build the query using the following:

Visitor::query()->truncate();

回答2:

the following should work as well,

Visitor::truncate();

回答3:

From the Laravel Docs

https://laravel.com/docs/5.6/queries#deletes says:

If you wish to truncate the entire table, which will remove all rows and reset the auto-incrementing ID to zero, you may use the truncate method:

DB::table('users')->truncate();

回答4:

another way if you dont have a model class for the table - Laravel 5.4

DB:connection(database connection name)->table(table name)->truncate();