How Laravel generates SQL queries

laravel wherein
laravel db::query
laravel eloquent
laravel raw query with parameters
laravel eloquent join
print query in laravel
simple select query in laravel
laravel collection

I have created a one-to-many relationship. Here are the model classes.

class Photo extends Model
{
    public function user(){
        return $this->belongsTo('App\User');
    }
}

class User extends Authenticatable
{ 
    public function photos(){
        return $this->hasMany('App\Photo');
    }
}

Then I try to retrieve photos:

$photos = User::find(1)->photos->where('photo', 'ut.jpg')->first();

Here is a query log I got. I do not see the photo='ut.jpg'. So how laravel generate SQL?

select * from `photos` where `photos`.`user_id` = 1 and `photos`.`user_id` is not null

Try this

$photos = User::find(1)->photos()->where('photo', 'ut.jpg')->first();

must be use ->photos() instead of ->photos.

For see sql query use

$sql = User::find(1)->photos()->where('photo', 'ut.jpg')->toSql();

How Do I Get the Query Builder to Output Its Raw SQL Query as a , I want to get the raw SQL query string that the database query builder above will generate. In this example, it would be SELECT * FROM users . How do I do this? A message from our CEO about the future of Stack Overflow and Stack Exchange. Read now.

You queried all photos by using this:

$photos = User::find(1)->photos->where('photo', 'ut.jpg')->first();

By using User::find(1)->photos you receive a Laravel Collection. Those collections have a where method as well. So basically, you are running SQL to get all photos of User 1 and then you just filter that collection to only show you the item with photo ut.jpg.

Instead, you can use brackets to get the relationship, and then query that. Your query then becomes

$photos = User::find(1)->photos()->where('photo', 'ut.jpg')->first();

Instead of naming it $photos you should name it $photo, as you are querying with first - which will result only in one object (or null).

Database: Query Builder - Laravel, The database query builder provides a convenient, fluent interface to creating and running database queries. The query above will produce the following SQL: Yes. Whether you are a beginner and want to learn how Laravel Eloquent or Query Builder work under the hood or you simply need to generate an SQL for some other purpose, you can definitely go and extract that SQL query. The way to do that is quick and easy: To output to the screen the last queries ran you can use this:

Can you please try this:

$photo = 'ut.jpg';

$photos = User::find(1)->whereHas('photos', function ($query) use($photo){
return $query->where('photo', $photo);
})->first();

Query Builder - Laravel, There are a few ways to show the SQL queries that are generated and executed by Laravel. toSql() - You can replace ->get() (or ->paginate() ) with ->toSql() to� To print a single query, use toSql() method of laravel to get the query to be executed like. App\User::where('balance','>',0)->where()->toSql(); Method 2. Laravel can optionally log in memory all queries that have been run for the current request.

your query $photos = User::find(1)->photos->where('photo', 'ut.jpg')->first(); is incorrect, laravel didnt see the where condition if you do this

User::whereHas('photos', function($q) {
      $q->where('photo', 'ut.jpg');

})->where('id',1)->first();

thats the correct query to get the user photo

How to show (or log) all SQL queries executed by Laravel (SOLVED , Laravel provides a fantastic database query builder and ORM system named query and would like to see the actual SQL being generated. Default Log file Log in the default log file “laravel.log” located at “storage/logs”. To log SQL queries, we have to add the following code snippet in the “AppServiceProvider.php” file in the “boot ()” function, located at “app/Providers”.

You could: Run A Select Query

$photos = DB::select('select * from photos where id = ?', [1]);

All this is well-documented in : --https://laravel.com/docs/5.0/database

Debugging Queries in Laravel ― Scotch.io, Laravel has a great database mechanism called Eloquent, also a powerful Query Builder, but sometimes it makes sense to just use plain SQL, in the form of Raw Queries. Want to generate Laravel adminpanel in minutes? 3. Using Laravel Debugbar. The third and most recommended option is by installing the Laravel Debugbar by the composer. It will provide you a detailed view of each and every query. composer require barryvdh/laravel-debugbar. If you familiar with other option to get Raw SQL query then please share it through comments.

5 Ways to Use Raw Database Queries in Laravel – Quick Admin Panel, Yes. Whether you are a beginner and want to learn how Laravel Eloquent or Query Builder work under the hood or you simply need to generate� Let’s run the raw SQL query that would be generated by Laravel: SELECT * FROM `tasks` WHERE `tasks`.`user_id` = 1 AND `tasks`.`user_id` IS NOT NULL Running this query takes ~1 sec on my machine. Not great. To help us debug the issue with this query we can use the MySQL EXPLAIN statement to help

How to Have Laravel Eloquent or Query Builder Output Raw SQL , Get code examples like "sql queries in laravel" instantly right from your google search results with the Grepper Chrome Extension. The simplest method to see the query generated is by utilizing a ->toSql () method. All that we need to do is replace the closing ->get () with ->toSql (). Then printing out the results with the dd (), die and dump, helper. Here is the updated query:

sql queries in laravel Code Example, Get started today with this Laravel Eloquent tutorial. There is no need to write SQL queries at all. All you This creates the migration file. Running Raw SQL Queries. Once you have configured your database connection, you may run queries using the DB facade. The DB facade provides methods for each type of query: select, update, insert, delete, and statement. Running A Select Query. To run a basic query, you may use the select method on the DB facade:

Comments
  • Possible duplicate of Laravel where on relationship object
  • I took the example from the documentation laravel.com/docs/5.8/eloquent-relationships#one-to-many. $comment = App\Post::find(1)->comments()->where('title', 'foo')->first(); The result that i got is correct. But the query not.
  • @user3351236 $comment = App\Post::find(1)->comments()->where('title', 'foo')->first(); the where condition is on the post not the comment and the one you did was on the photo not the user