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
I have an existing laravel model, with many where conditions chained to it.
i.e WHERE username='john' AND (updated_at > "2017-01-01" OR ... ) AND ...
I don't know how many previous queries there are, and i don't have access to them. I only have access to the model instance after it has received some where conditions.
i.e i have a function that receives a model as its parameter, and i want
to add an OR condition to already existing wheres
function notDeleted($model) {
// model has already a bunch of where/or where conditions at this point
// i want return rows, that match either all the previous conditions
// OR this new condition that i add inside this function.
}
I would like to add an OR condition, in the following way.
Select * from users WHERE ( (query1 AND query2 AND ...) OR deleted_at IS NULL);
if u simply use
->orWhere, then the query will be
select * from users where query1 AND query2 AND ... OR deleted_at is null
Note: the table names, columns etc are made up for SO post, my actual use case is a bit more complicated.
I had a similar problem and this is how I solved it:
// Create new \Illuminate\Database\Query\Builder with current wheres in a group
$new_query = $query_builder->getQuery()->forNestedWhere();
$new_query->addNestedWhereQuery($query_builder->getQuery());
// Add the new query in another group
$new_query->whereIn($fk_field,
function($q) use ($index_name, $args) {
// Ignore the Sphinx stuff, just add your new condition here.
$q->select(\DB::raw(SphinxSearch::getRawSelect($index_name)))
->where('query', SphinxSearch::getRawQueryString($args));
});
// Replace original \Illuminate\Database\Eloquent\Builder's internal
// \Illuminate\Database\Query\Builder with the new one
$query_builder->setQuery($new_query);
Put the criteria you want to wrap in a closure:
$model->where(function($query) {
$query->where('field', 'value')
->where('field2', 'value');
})
->orWhereNull('deleted_at');
Try to wrap where condition like this below
SomeModel::where(function($q){
$q->where(query1 AND query2 AND ...)
->orWhere(deleted_at IS NULL);
})->get();
Above code is just a sample. You need to modify to your requirements.
For more information check this link Nested Parameter Grouping
lets say I have 7 columns in table, and I want to select only two of them, something like this
SELECT `name`,`surname` FROM `table` WHERE `id` = '1';
In laravel eloquent model it may looks like this
Table::where('id', 1)->get();
but I guess this expression will select ALL columns where id equals 1, and I want only two columns(name, surname). how to select only two columns?
You can do it like this:
Table::select('name','surname')->where('id', 1)->get();
Table::where('id', 1)->get(['name','surname']);
You can also use find() like this:
ModelName::find($id, ['name', 'surname']);
The $id variable can be an array in case you need to retrieve multiple instances of the model.
By using all() method we can select particular columns from table like as shown below.
ModelName::all('column1', 'column2', 'column3');
Note: Laravel 5.4
You first need to create a Model, that represent that Table and then use the below Eloquent way to fetch the data of only 2 fields.
Model::where('id', 1)
->pluck('name', 'surname')
->all();
Also Model::all(['id'])->toArray() it will only fetch id as array.
Get value of one column:
Table_Name::find($id)->column_name;
you can use this method with where clause:
Table_Name::where('id',$id)->first()->column_name;
or use this method for bypass PhpStorm "Method where not found in App\Models":
Table_Name::query()->where('id','=',$id)->first()->column_name;
in query builder:
DB::table('table_names')->find($id)->column_name;
with where cluase:
DB::table('table_names')->where('id',$id)->first()->column_name;
or
DB::table('table_names')->where('id',$id)->first('column_name');
last method result is array
You can use get() as well as all()
ModelName::where('a', 1)->get(['column1','column2']);
From laravel 5.3 only using get() method you can get specific columns of your table:
YouModelName::get(['id', 'name']);
Or from laravel 5.4 you can also use all() method for getting the fields of your choice:
YourModelName::all('id', 'name');
with both of above method get() or all() you can also use where() but syntax is different for both:
Model::all()
YourModelName::all('id', 'name')->where('id',1);
Model::get()
YourModelName::where('id',1)->get(['id', 'name']);
To get the result of specific column from table,we have to specify the column name.
Use following code : -
$result = DB::Table('table_name')->select('column1','column2')->where('id',1)->get();
for example -
$result = DB::Table('Student')->select('subject','class')->where('id',1)->get();
use App\Table;
// ...
Table::where('id',1)->get('name','surname');
if no where
Table::all('name','surname');
If you want to get a single value from Database
Model::where('id', 1)->value('name');
Also you can use pluck.
Model::where('id',1)->pluck('column1', 'column2');
You can use Table::select ('name', 'surname')->where ('id', 1)->get ().
Keep in mind that when selecting for only certain fields, you will have to make another query if you end up accessing those other fields later in the request (that may be obvious, just wanted to include that caveat). Including the id field is usually a good idea so laravel knows how to write back any updates you do to the model instance.
You can get it like
`PostModel::where('post_status', 'publish')->get(['title', 'content', 'slug', 'image_url']`)
link
you can also used findOrFail() method here it's good to used
if the exception is not caught, a 404 HTTP response is automatically sent back to the user. It is not necessary to write explicit checks to return 404 responses when using these method not give a 500 error..
ModelName::findOrFail($id, ['firstName', 'lastName']);
While most common approach is to use Model::select,
it can cause rendering out all attributes defined with accessor methods within model classes. So if you define attribute in your model:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class User extends Model
{
/**
* Get the user's first name.
*
* #param string $value
* #return string
*/
public function getFirstNameAttribute($value)
{
return ucfirst($value);
}
}
And then use:
TableName::select('username')->where('id', 1)->get();
It will output collection with both first_name and username, rather than only username.
Better use pluck(), solo or optionally in combination with select - if you want specific columns.
TableName::select('username')->where('id', 1)->pluck('username');
or
TableName::where('id', 1)->pluck('username'); //that would return collection consisting of only username values
Also, optionally, use ->toArray() to convert collection object into array.
If you want to get single row and from the that row single column, one line code to get the value of the specific column is to use find() method alongside specifying of the column that you want to retrieve it.
Here is sample code:
ModelName::find($id_of_the_record, ['column_name'])->toArray()['column_name'];
If you need to get one column calling pluck directly on a model is the most performant way to retrieve a single column from all models in Laravel.
Calling get or all before pluck will read all models into memory before plucking the value.
Users::pluck('email');
->get() much like ->all() (and ->first() etc..) can take the fields you want to bring back as parameters;
->get/all(['column1','column2'])
Would bring back the collection but only with column1 and column2
You can use the below query:
Table('table')->select('name','surname')->where('id',1)->get();
If you wanted to get the value of a single column like 'name', you could also use the following:
Table::where('id', 1)->first(['name'])->name;
For getting multiple columns (returns collection) :
Model::select('name','surname')->where('id', 1)->get();
If you want to get columns as array use the below code:
Model::select('name','surname')->where('id', 1)->get()->toArray();
If you want to get a single column try this:
Model::where('id', 1)->first(['column_name'])->column_name;
Im using Eloquent. But I'm having trouble understanding Eloquent syntax. I have been searching, and trying this cheat sheet: http://cheats.jesse-obrien.ca, but no luck.
How do i perform this SQL query?
SELECT user_id FROM notes WHERE note_id = 1
Thanks!
If you want a single record then use
Note::where('note_id','1')->first(['user_id']);
and for more than one record use
Note::where('note_id','1')->get(['user_id']);
If 'note_id' is the primary key on your model, you can simply use:
Note::find(1)->user_id
Otherwise, you can use any number of syntaxes:
Note::where('note_id', 1)->first()->user_id;
Note::select('user_id')->where('note_id', 1)->first();
Note::whereNoteId(1)->first();
// or get() will give you multiple results if there are multiple
Also note, in any of these examples, you can also just assign the entire object to a variable and just grab the user_id attribute when needed later.
$note = Note::find(1);
// $user_id = $note->user_id;
Seems like such a simple thing, but I can't get my query to return the number of records in a group. Here's my statement:
public function getGroupCount($user_id)
{
$q = Doctrine_Query::create()
->select('ss.*')
->from('SalarySurvey ss')
->where('ss.user_id=?', $user_id)
->groupBy('created_at')
->execute();
return $q->rowCount();
}
rowCount() does not work in the above query.
It might also be helpful to know that this is being used in a foreach statement.
As CappY suggested, this is not possible in Doctrine 1.2, as far as I know. As a work-around, I was able to finally get a count for each grouping by adding another field to the table and setting that field the same for each group at save time. Then I changed my query to pull that field and just did a simple:
$q->count();
Never work with Doctrine 1.2, but can't U use php's count function or SELECT COUNT() AS 'cnt' ?
return count($q);