I working with Laravel and postgres. I have a code:
$users->orderBy(\DB::raw("FIELD(status, $orderedStatuses)"));
After running, I get error: Undefined function FIELD() in postgres. How I can resolve this issue?
The problem is that the second onwards parameters to FIELD should be valid MySQL literals. In this case, assuming your status values are text, these parameters need to be CSV valid strings. You could use implode here as follows:
$items = "'" . implode("', '", $orderedStatuses) . "'";
// ...
$users->orderBy(\DB::raw("FIELD(status, $items)"));
Note that this approach may expose you to SQL injection. Assuming the list of fields to be used with FIELD are relatively small, it would be safer to use just ORDER BY using a CASE expression.
Edit:
As you are using Postgres, and not MySQL or MariaDB, there is no FIELD function available to you, even with raw SQL. So, you should instead order by a CASE expression, something like this:
ORDER BY CASE status WHEN 'start' THEN 1 WHEN 'middle' THEN 2 ELSE 3 END
Updated Laravel code:
$orderBy = "CASE status WHEN 'start' THEN 1 WHEN 'middle' THEN 2 ELSE 3 END";
$users->orderBy(\DB::raw($orderBy));
I am fetching a list of data using Eloquent method and trying to reverse the order of array, I am getting an error.
Here is the code :(Previous Code)
$temp = Product::paginate(20);
New Code
$temp = Product::paginate(20)->orderBy('id','desc');
Error :
Method Illuminate\Database\Eloquent\Collection::orderBy does not exist.
New method :
$temp = Product::paginate(20)->sortDesc();
Error :
Method Illuminate\Database\Eloquent\Collection::appends does not exist.
Can anyone help me?
use below syntax
Product::orderBy('id','desc')->paginate(20);
try to write it in this way,
use orderBy before the paginate
$temp = Product::orderBy('id','desc')->paginate(20);
->latest() fetches the most recent set of data from the Database. In short, it sorts the data fetched, using the 'created_at' column to chronologically order the data.
Product::latest()->paginate(20)
lets say I have 7 columns in table, and I want to select only two of them, something like this
SELECT `name`,`surname` FROM `table` WHERE `id` = '1';
In laravel eloquent model it may looks like this
Table::where('id', 1)->get();
but I guess this expression will select ALL columns where id equals 1, and I want only two columns(name, surname). how to select only two columns?
You can do it like this:
Table::select('name','surname')->where('id', 1)->get();
Table::where('id', 1)->get(['name','surname']);
You can also use find() like this:
ModelName::find($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;
I'm trying to count result from my query which is using multiple where query. But it doesn't seem to be working.
My syntax is:
$partialpaidquery=['month' => $maina];
$partialpaid=Bill::where($partialpaidquery)->where('paid','!=',0)->where('fee_status','<','amount')->count();
where clause upto where('paid','!=',0) seems to work but the third one is not working. What is the problem here? It actually should have returned 1. But it is returning 0.
Seems you are using wrong query :
You are comparing < string 'amount' instead of use variable $amount
like below:
$partialpaidquery=['month' => $maina];
$partialpaid=Bill::where($partialpaidquery)->where('paid','!=',0)->where('fee_status','<',$amount)->count();
Use your third where as
->whereRaw('fee_status < amount')
because the way you are using it , the amount column is being interpreted as string not column.
So I got a wierd bug (or maybe I'm just stupid), when I runs an active record query. Take a look at this:
$results = $this->db->
select('cd.casino_name, cd.casino_opened, cd.casino_latitude, cd.casino_longitude')->
from('casino_data as cd, casino_cities as cc')->
where('cd.city_id',$city_id)->
where('cd.city_id=cc.city_id')->
get()->result_array();
Then I got that:
Error Number: 1054
Unknown column 'cd.city_id=cc.city_id' in 'where clause'
SELECT `cd`.`casino_name`, `cd`.`casino_opened`, `cd`.`casino_latitude`, `cd`.`casino_longitude`
FROM (`m_casino_data` as cd, `m_casino_cities` as cc)
WHERE `cd`.`city_id` = 1
AND `cd`.`city_id=cc`.`city_id`
Filename: httpdocs/_dev/libraries/Test.php
Line Number: 649
Sh*t happened... Or in v2.0 CI has been changed something in the DB class?
help plz...thx
The problem is there with the where clause
$results = $this->db->
select('cd.casino_name, cd.casino_opened, cd.casino_latitude, cd.casino_longitude')->
from('casino_data as cd, casino_cities as cc')->
where('cd.city_id',$city_id)->
where('cd.city_id','cc.city_id')->//this would produce WHERE cd.city_id = cc.city_id
get()->result_array();
CodeIgniter's AR protecting works poorly sometimes. In this cases I think you should use an optional parameter FALSE to avoid autoprotecting. But not all function accepts this parameter - but where yes!
$this->db->where() accepts an optional third parameter. If you set it to FALSE, CodeIgniter will not try to protect your field or table names with backticks.
See documentation (you can find near 4. Custom string).