I'm working in Laravel and I'm interested in checking the SQL statements generated by a Eloquent query that includes a with() statement. For some reason I'm getting only the main query. For example, when I run
class Child extends EloquentVersioned {
public function childRequests()
{
return $this->hasMany('ChildRequest');
}
}
$childQuery = Child::orderBy('last_name')->orderBy('first_name')->with( 'childRequests');
return $childQuery->toSql();
I get back:
select `children`.* from `children` order by `last_name` asc, `first_name` asc
How do I get back the SQL for the with('childRequests') query?
Actually, when using with then Laravel uses another query for that so you are not getting that query output but if you use DB::getQueryLog() then you'll get all the query logs and to get your log you may run the actual query, for example:
Child::orderBy('last_name')->orderBy('first_name')->with( 'childRequests')->get();
Now try this:
dd(DB::getQueryLog()); // an array of all queries
You'll get an output of your queries and you may find the last query using:
$queries = DB::getQueryLog();
dd(end($queries)); // only last query
Troubleshooting
If you get no results on DB::getQueryLog() then the Query Logger may be disabled at all and you have to use DB::enableQueryLog() before.
Related
Laravel Version: 8.0
PHP Version: 7.3.0
Database Driver & Version: MySQL 5.7.34
Describe the Bug
When I use paginate for pagination the data it call the count( * ) query every time even I pass the column name like count(['id']), and the count( * ) query scan all row in the table.
Table name is users and it has 45 column
Route
Route::get("users", "UsersController#index");
Controller
namespace App\Http\Controllers\Api\V1;
class UsersController extends Controller
{
public function index()
{
return User::paginate(10 , ['id']);
}
}
Call users route
Telescope showing me that two queries
Actual result
Expected result
Steps To Solution:
The following image shows that I had done changes as per our functionality, It will take the first column name from the passed in the paginate method array of $columns params and that query does not scan all columns of the users tables.
Final Results:
I have tired to solving this issue any other way or idea then please let me know
Its not recommended to ever touch the vendor files, you can always just override the functionality inside of your model, you can also pass in the columns to override the getCountForPagination() and you can also pass the columns to simplePaginate() that doesn't invoke any counting!
In order to optimize the query to count and paginate, you can do it like this:
//We will call the query on the model
$program = Program::query()->getQuery();
//count the query by specific columns
$thePaginationCount = $program->getCountForPagination(['id']);
//paginate the results using simplePaginate and select the columns we want:
$thePaginatedProgram = $program->simplePaginate(10, ['id', 'name']);
return 'test: '.$thePaginatedProgram;
Will result like this:
select count(`id`) as aggregate from `programs`
select `id`, `name` from `programs` limit 11 offset 0
As you can see it will only load what we specify and its very efficient!
Final Note:
If you just want to paginate without the count, you can always call Model::simplePaginate($amount, [$columns...])
https://laravel.com/docs/9.x/pagination#simple-pagination
in sql query this commando do exactly i wanted:
SELECT
v.id,
(
SELECT sv.status_id
FROM status_viagem sv
WHERE sv.viagem_id = v.id
ORDER BY sv.created_at DESC LIMIT 1 ) AS status_id
FROM viagens v
Here is the sql results:
But i have no idea how can i do this using Laravel eloquent
Basically, a viagem entry can has a lot of status, but i need to get each viagem and their last status entry from status_viagem table (the pivot table)
by the way viagem/viagens means travel.
My class mapping:
class Viagem extends Model
{
...
public function status()
{
return $this->belongsToMany('App\Status')->withTimestamps();
}
...
}
class Status extends Model
{
public function viagens()
{
return $this->belongsToMany('App\Viagem')->withTimestamps();
}
}
The belongsToMany at both classes gets me a many-to-many:
can someone help me? thanks
---------- Temporary Solution -------
Thanks for all help guys. In fact i can't find a nice solution using only eloquent.
Step 1/3 - To bypass this situation i first execute the above sql to grab only the viagens under the desired status_id (last status_viagem entry):
$viagens_ids = DB::select(
"SELECT viagem_id FROM (
SELECT
v.id AS viagem_id,
(
SELECT sv.status_id
FROM status_viagem sv
WHERE sv.viagem_id = v.id
ORDER BY sv.id DESC LIMIT 1 ) AS status_id
FROM viagens v
) AS tt
WHERE tt.status_id = {$status->id}"
);
Step 2/3 - then i used the array_map to organize my viagens ids
$a = array_map(
function($obj) { return $obj->viagem_id; },
$viagens_ids
);
Step 3/3 - And at last i used elequent whereIn to fetch my viagens:
Viagem::with( 'status')->whereIn('id', $a)->get();
In fact i have solved the problem by a-old-sashion-way but i not happy with it because i wish i learn how to do it using eloquent. what bad to me.
There are many ways to query in laravel. I have created a test project for you to try. The gist are:
1. Eloquent ORM
Eloquent ORM is Laravel's magic which have some limitations in eager loading - which i just come across while contemplating your question for hours. It wont play nicely with first(), last(), and some more functions in the constrained eager loading closure.
In your case, our almost there can be fixed:
App\Models\Viagem::with(['status' => function($query){
return $query->orderBy('pivot_created_at', 'desc');
}])
->get()
It will return entire field for Viagem and Status including its pivot table (the status_viagem).
However, if you wanted to retrieve only viagem.id and status_viagem.status_id, you can map() it as such:
App\Models\Viagem::with(['status' => function($query){
return $query->orderBy('pivot_created_at', 'desc');
}])
->get()
->map(function($data){
$o = new stdClass();
$o->id = $data->id;
$o->status_id = $data->status->first()->id;
return $o;
});
Please take note that the statement above require sql query to be ran twice. Eager loading basically works by querying all the Viagem first then queries the Status and map them in memory based on the foreign keys. You can observe that replacing get with toSql will only give you the first query. Please enable Query Logging to see the second query.
2. Query Builder
Embarking from Ryan Adhitama Putra answer, you could do something like:
App\Models\Viagem::join('status_viagem', 'viagens.id', '=', 'status_viagem.viagem_id')
->orderBy('status_viagem.created_at', 'desc')
->groupBy(['status_viagem.status_id', 'viagens.id'])
->select(['viagens.id', 'status_viagem.status_id'])
->get();
This query builder approach guaranteed to be ran only once, you can replace the get() with toSql() to see the resulting query.
3. Raw Queries
Throwing DB::raw() can help sometime, but i really did not want to mention it.
I am not sure what viagens and viagem represent, but I think one of the relationships has to be belongsToMany() and the other hasMany().
then after you set relationships correctly, you can use Eloquent like this :
$status_id = Viagem::with('status')->orderBy('created_at', 'desc')->first()->pluck('status_id');
Try this.
$status_id = Viagem::join('status','viagem.id','status_viagem.viagem_id')
->select('viagem.id','status_viagem.status_id')
->get();
some make me confusing in laravel when i use all() data is showing but when i select find or where data not showing when i use dd function in laravel
//$regency = Regency::find(1101);
//$regency = Regency::where('number','=',$prov_id);
$regency = DB::table('regencies')->where('province_id', $prov_id);
dd($regency);
i try use eloquent and query builder but still same result.
those is result in dd if i using query builder, but why when i use select all data is showing
What you are showing is the Query Builder you need to execute it with ->get() to get the Collection.
You have to get the data from the query builder in order to receive the results as a collection of objects
// $regency = Regency::findOrFail(1101);
// $regency = Regency::where('number', $prov_id)->get();
$regency = DB::table('regencies')->where('province_id', $prov_id)->get();
dd($regency);
Writing a query builder just produces the SQL query but doesn't actually execute/run it
Hope this helps
I am working on laravel 5.4. I am trying to get data from database using below query:
$obj = \Illuminate\Support\Facades\DB::table('A')
->join('B', 'A.Intake', '=', 'B.Id')
->join('C', 'B.StreamId', '=', 'C.StreamId')
->select(\Illuminate\Support\Facades\DB::raw('DISTINCT(C.StreamId) As StreamId'))
->where('A.YearId', $yearId);
$streamIds = $obj->get()->toArray();
The above query is returning empty results. I have also debug the query generated by laravel. Below is the raw query generating by laravel on the basis of above conditions:
select DISTINCT(C.StreamId) As StreamId from A
inner join B on A.Intake = B.CentreStreamId
inner join C on B.StreamId = C.StreamId
where A.YearId = '12'
When I run the above raw query directly in my database, then it returns me some records. But when I try to get records in laravel then it returns me empty results.
I am not able to get the issue with the above query. Can someone please tell me why it is returning empty results set? If there is any issue with above query builder syntax then please correct my query.
Thanks in Advance.
Here is my controller code;
$temp_table_data = $temp_table
->setTempTable($generated_temp_table)
->newQuery()
->with(['payment' => function ($query) use ($column_values) {
$query->select($column_values);
}])->get();
My toSql query is right below it;
$sql = str_replace(['%', '?'], ['%%', "'%s'"], $temp_table->toSql());
$fullSql = vsprintf($sql, $temp_table->getBindings());
print_r($fullSql);
My code prints out;
select * from `selected_postcodes_1434968225_1`
Where are the details of the payments information that I am "with"ing? If I want to print out the raw query now, to show another developer, to get some help, what am I supposed to do here?
The eager loaded relationships are fetched in a separate query. You can use DB::getQueryLog() to get all run queries. Note that you have to enable it first using with DB::enableQueryLog().
Another alternative is the Laravel Debugbar package that shows you all queries and much more.