I'm trying to learn about laravel / eloquent orm.
How does one implement an existing database/table with eloquent. Any examples out there? Everything out there shows how to create database/tables. I'd like to use existing data structure and implement classes.
Try reading the docs, creating tables is only handled by migrations. Eloquent can work with any pre existing schema
Pretty much top of the Laravel Eloquent page http://laravel.com/docs/4.2/eloquent#basic-usage
class User extends Eloquent {
protected $table = 'my_users';
}
Related
I am very new to Laravel and quite confuse with the model and database thing. I understand that a model represent one table. So I created a model using artisan command without migration and it created the code as follow.
namespace App;
use Illuminate\Database\Eloquent\Model;
class RegCars extends Model
{
//
}
Since I have a different table name, so I add protected $table = 'regcars'; and assume that this model can now access the table by running query such as RegCars::where('user_id', $user_id); from controller. But I wasn't able to get anything by running it.
So I am wondering, how does this model able to run the query? Is the migration needed in order to do this? Is there still other area I need to set before I can run any query?
highly recommend to read docs or at least watch a tutorial.
what you get is a query build not a model or a collection of models. laravel(eloquent) doesnt exactly know what you want so you query database then get the data by methods that laravel gives you if assume you want a RegCars you need a method like first:
RegCars::where('user_id', $user_id)->first(); // now you have model
more info: https://laravel.com/docs/8.x/eloquent
is there any way to get the defined relationships in eloquent model. I have a situation where I need to get the model relationships so I can update all other eloquent models that relies on a specific id before delete it
There's no unified method to iterate over all registered relationships of a class. You can, however, access all the currently loaded relationships of a model instance (via the ->relations attribute or the getRelations() method), but that's not what you're up to. I'd suggest you take a look at laravel's documentation on inserting and updating relationships. So far that's the best laravel provides out of the box, the rest is developing approaches.
Try this function:
public function getRelations()
You can use
$model->getRelations()
function to get all relations
Also refer below link for details https://laravel.com/api/5.7/Illuminate/Database/Eloquent/Concerns/HasRelationships.html#method_getRelations
class Product extends Model
{
/**
* Table name
* #var string
*/
protected $table = 'products';
/**
* #return \Illuminate\Database\Eloquent\Relations\BelongsTo
*/
public function buyerSupplier()
{
return $this->belongsTo('App\Models\Buyer', 'buyer_id');
}
}
Above is example code, if I call $this->buyerSupplier()->get() will it run MySQL?
Please, someone, tell me how this Laravel relationship is working?
The answer is Yes Laravel runs mysql queries behind the scene, here is a brief description from Laravel Official documents,
Laravel's database query builder provides a convenient, fluent interface to creating and running database queries. It can be used to perform most database operations in your application and works on all supported database systems.
The Laravel query builder uses PDO parameter binding to protect your application against SQL injection attacks. There is no need to clean strings being passed as bindings.
And about the relationships queries Laravel uses Eloquent:
Eloquent relationships are defined as methods on your Eloquent model classes. Since, like Eloquent models themselves, relationships also serve as powerful query builders, defining relationships as methods provides powerful method chaining and querying capabilities.
And for more details about how to choose between relationships methods
read more from Laravel Official Documents
Simple question here:
In laravel 5.3 how would I pull the comments from a database table? Is there a clean way of doing it using some of the out-of-the-box features that laravel provides??
Thank you in advance.
Laravel 5.2-5.3, as far as I know, comes with a built-in package called doctrine that allows you to interact with a lot more within a database and it's tables than eloquent. I believe the framework members will eventually add more to the system so you can make more dynamic use of a DB and tables etc.
For the time being this is how I implement accessing the structure (comments included) of a database table:
$settings = SomeModel::where($items_match)->get(); //Making use of Eloquent
$columns = DB::connection('database_name_here')
->getDoctrineSchemaManager()
->listTableDetails('table_name_here');
foreach ($settings as $key => $value) {
if ($comments[$key] = $columns->getColumn($key)->getComment()) {
}
}
It's fairly clean and get's the job done. The only downside I see is it's a double hit to the DB which I'm thoroughly against, I'm working on a way to combine the 2 implementations in laravel so that it's only 1 query doing both jobs.
I am very beginner to PHP and Laravel.
I am using laravel 5 eloquent ORM. I have an array $caseIDs and want to fetch the data from db where caseID (column name) matches from one of the $caseIDs elements. Can I use where() method of eloquent ORM? or How can i do it?
You need to use whereIn which simulates a WHERE IN('comma','separated','values')
YourModel::whereIn('caseID', $caseIDs)