I have a distance calculation query that works, i.e. it returns the closest points, but it simply yields an array of distances. What I want to do is retrieve the ids of the points stored in the array so I can access further data.
Here's the query:
$Eastings = $asset->Eastings;
$Northings = $asset->Northings;
$micromarket_size = 10000;
$competitors = DB::table('homes')
-> select(DB::raw('SQRT(POW('.$Eastings.' - `Eastings`,2) + POW('.$Northings.' - `Northings`,2)) AS distance'))
-> having('distance', '<', $micromarket_size)
-> get();
And trying to access the id like so:
$competitors->id;
yields an error trying to get property of non-object
Your select query is not requesting the id field:
->select(array('id', DB::raw('SQRT(POW('.$Eastings.' - `Eastings`,2) + POW('.$Northings.' - `Northings`,2)) AS distance')))
You get array of stdObjects using DB::table()->get(), thus if you want to retrieve only one model replace get() with first(). Otherwise get single element from array.
Related
I've been trying this query
Model::find()
->innerJoin('TranslationTable', 'TranslationTable.model_id = Model.id')
->where(['IN', 'translation_code', $arrayOfTranslationCodes])
->asArray()
->all();
The translation table contains multiple rows with the same ID but with different translation codes.
This query only returns the first matching locale for a given ID. How would I retrieve the other translation codes for a given ID?
This is the solution that I came to:
$query = Model::find()
-> innerJoin('TranslationTable', 'TranslationTable.model_id = Model.id');
foreach ($arrayOfTranslationCodes as $translation)
{
$query->andWhere(['OR', 'translation_code', $translation])
}
$queryResponse = $query->asArray()->all();
This allowed me to find rows with the same id, but have different translations. You need to store the $query->asArray()->all(); as $query itself just returns the active query.
i want to get difference between two values. i get my last entered value in bill no and get difference with input value.
this is my controller function model
$restPaymentSales = DB::table('sales')
->select('rest_payment')
->where('bill_no', $request->input('bill_no'))
->orderBy('created_at', 'desc')
->first();
$payment = $request->input('payment');
$doubleVal = doubleval($payment);
and i wrote calculation like this
$restSales = $restPaymentSales->child['rest_payment'] - $doubleVal;
but it shows me this error
Trying to get property of non-object
my table row like this
rest_payment -> double(11,2)
how can i fix this issue. basically i want to get difference between table last value order by date and input value.
Update your calculation from:
$restSales = $restPaymentSales->child['rest_payment'] - $doubleVal;
TO
$restSales = $restPaymentSales->rest_payment - $doubleVal;
I'm new to Laravel and here's my issue.
I have a table currentpercentage.
This is the structure of the table currentpercentage
currentpercentage(**id**, name, total_cap, current_usage, created_at, updated_at)
I'm trying to calculate percentage of current usage; based on total_cap and current usage.
total_cap = 1000,
current_usage = 237,
name = User Name
In my controller i've setup a query to get the value of total_cap and the value of current_usage then calculate that the percentage would be.
When i call my query, it returns an array with the column name (total_cap) and value (1000). Same as when i query for current_usage.
{
"currentpercentage": [
{
"total_cap": 1000
}
]
}
I just want the query to return just the number (1000) without the array.
This is my query
$totalcap = CurrentPercentageModel::select('total_cap')->where('name', '=', 'User Name')->get();
How do I just get the value. Or is there an easier way to calculate the percentage from one query?
CurrentPercentageModel //What I use to connect to the database. DB Model
The problem is that you are using the get method which returns a collection even when you only have one row.
$totalcap = CurrentPercentageModel::select('total_cap')->where('name', '=', 'User Name')->get();
If you just want one record and one column value, then use the value method to get just the value of the column, more info here (you might have to scroll a little bit)
$totalcap = CurrentPercentageModel::select('total_cap')->where('name', '=', 'User Name')->value('total_cap');
I'm having a problem getting some datas from my database via eloquent:
at first I do this to get 'id' and 'capMax' from clase_schedule table:
$plazas = DB::table('clase_schedule')->select(['schedule_id', DB::raw('SUM(capMax) as capMax')])->groupBy('schedule_id')->get();
and then i want to get the the name of table schedule where the id i got before coincides with the one on this table, like this:
$nom_horarios = DB::table('schedule')->select('name')->where('id', 'in', $plazas->schedule_id)->get();
I get this error:
"Trying to get property of non-object"
Since, $plazas is an array so you should loop the $plazas to get the value in next query as below :
foreach ($plazas as $plaza)
{
$nom_horarios[] = DB::table('schedule')->select('name')->where('id', 'in',$plaza->schedule_id)->get();
}
print_r($nom_horarios);
$plazas returns an array of items, instead of get(), use first(). This will return single item.
$plazas = DB::table('clase_schedule')->select(['schedule_id', DB::raw('SUM(capMax) as capMax')])->groupBy('schedule_id')->first();
Or loop plazas in foreach
What is returning in the $plazas variable?
I think the problem is you are getting a collection and not a item... If you want to get just one plaza you should ->first() instead of ->get();
So I trying to build a notification system (CodeIgniter) and not store it in my database by this unique ID. Now I got some problem to using `SELECT query.
Also this is array stored in "value" row:
[{"id":0,"user_id":"1","comment":"That's a Nice Video.","posttime":1403523177,"status":1},{"id":1,"user_id":"4","comment":"Nice to see this..!!","posttime":1403590409,"status":1}]
And this is my (not work) query:
$query = $this->db->get_where('post_meta',array('status'=>1),in_array('user_id', $id));
Ideas?
Note: Notification will be sparated by "user_id".
You should not use in_array('user_id', $id) on that function because it returns boolean.
On the active record page: https://ellislab.com/codeigniter/user-guide/database/active_record.html you can take a look at parameter it takes for get_where() function
$query = $this->db->get_where('mytable', array('id' => $id), $limit, $offset);
Notice how the third parameter takes $limit which talks about the number of data you'll receive. (Leaving this blank will return you all data).
Some code examples:
If you just want to get the data with status = 1, use the following:
$query = $this->db->get_where('post_meta',array('status'=>1));
If you want to get the data with status = 1 and user_id = $id, use the following:
$this->db->like('value', '"user_id":"'.$id.'"');
$query = $this->db->get_where('post_meta',array('status'=>1));
The solution above is not the best, but it should work.
The $this->db->like() function will create rules to get data in value row which has "user_id":"$id" where $id is the value that you define.
What if I want to get all notifications and group them based on their ID?
I usually get all the data and then use PHP to group them into its own array. I think it's cheaper than relying on database to do that (Correct me if i'm wrong).
So use the first code:
$query = $this->db->get_where('post_meta',array('status'=>1));
Then iterate them using foreach() or whatever you find convenient.
$data = array();
foreach($query as $k=>$v) {
// Run a function to get User ID
$user_id = your_function_here($v->value);
if(!isset($data[$user_id]))
$data[$user_id] = array();
// This is just some example to group them together, you can optimize it to your own liking
array_push($data[$user_id],$v);
}
your_function_here() is your function to get the user_id from value row on your database.