Asked  8 Months ago    Answers:  5   Viewed   33 times

Mysql query like this :

SELECT
  GROUP_CONCAT(DISTINCT
    CONCAT(
      'ifnull(SUM(case when location_code = ''',
      location_code ,
      ''' then quantity end),0) AS `',
      location_code , '`'
    )
  ) INTO @sql
FROM
  item_details;
SET @sql = CONCAT('SELECT item_number,SUM(quantity) as "total_quantity", ', @sql, ' 
                  FROM item_details
                   GROUP BY item_number');

PREPARE stmt FROM @sql;
EXECUTE stmt;

DEALLOCATE PREPARE stmt;

I want to convert it to laravel eloquent, but i'm confused. Because there exist many statement. There exist PREPARE, EXECUTE, SET, DEALLOCATE etc. You can see query above

How can I convert it to laravel eloquent?

 Answers

36

It's mostly raw queries:

DB::table('item_details')->selectRaw('GROUP_CONCAT(...) INTO @sql')->get();
DB::statement('SET @sql = CONCAT(...)');
DB::statement('PREPARE stmt FROM @sql');
DB::statement('EXECUTE stmt');
DB::statement('DEALLOCATE PREPARE stmt');

Try this:

DB::table('item_details')->selectRaw('GROUP_CONCAT(...) INTO @sql')->get();
$sql = DB::selectOne('select @sql')->{'@sql'};
ItemDetails::select('item_number', DB::raw('SUM(quantity) as total_quantity'))
    ->selectRaw($sql)
    ->groupBy('item_number')
    ->get();
Wednesday, March 31, 2021
 
redrom
answered 8 Months ago
40

If you're on Laravel 5.2 and using MySQL, there was a bit of a "bug" introduced with the timestamps. You can read all about the issue on github here. It has to do with the timestamp defaults, and MySQL automatically assigning DEFAULT CURRENT_TIMESTAMP or ON UPDATE CURRENT_TIMESTAMP attributes under certain conditions.

Basically, you have three options.

  1. Update MySQL variable:

If you set the explicit_defaults_for_timestamp variable to TRUE, no timestamp column will be assigned the DEFAULT CURRENT_TIMESTAMP or ON UPDATE CURRENT_TIMESTAMP attributes automatically. You can read more about the variable here.

  1. Use nullable timestamps:

Change $table->timestamps() to $table->nullableTimestamps(). By default, the $table->timestamps() command creates timestamp fields that are not nullable. By using $table->nullableTimestamps(), your timestamp fields will be nullable, and MySQL will not automatically assign the first one the DEFAULT CURRENT_TIMESTAMP or ON UPDATE CURRENT_TIMESTAMP attributes.

  1. Define the timestamps yourself:

Instead of using $table->timestamps, use $table->timestamp('updated_at'); $table->timestamp('created_at'); yourself. Make sure your 'updated_at' field is the first timestamp in the table, so that it will be the one that is automatically assign the DEFAULT CURRENT_TIMESTAMP or ON UPDATE CURRENT_TIMESTAMP attributes.

Wednesday, March 31, 2021
 
MassiveAttack
answered 8 Months ago
31

This can be done in (at least) 2 ways.

Using pure Eloquent model logic:

class Buy extends Model
{
  public function getTotalPrice() {
    return $this->buyDetails->sum(function($buyDetail) {
      return $buyDetail->quantity * $buyDetail->price;
    });
  }
}

The only issue here is that it needs to fetch all buy details from the database but this is something you need to fetch anyway to display details in the view.

If you wanted to avoid fetching the relation from the database you could build the query manually:

class Buy extends Model
{
  public function getTotalPrice() {
    return $this->buyDetails()->sum(DB::raw('quantity * price'));
  }
}
Saturday, May 29, 2021
 
Jeff
answered 5 Months ago
86

The easiest way would probably be to splice it in, like this:

$collection->splice(2, 0, [$item4]);

Collections usually support the same functionality as regular PHP arrays. In this case, it's the array_splice() function that's used behind the scenes.

By setting the second parameter to 0, you essentially tell PHP to "go to index 2 in the array, then remove 0 elements, then insert this element I just provided you with".

Saturday, May 29, 2021
 
VostanAzatyan
answered 5 Months ago
33

You have to supply the aggregate function in having clause, we can reuse the same one that we have in select like this

$brand = "MAX(CASE WHEN b.attribute_code = 'brand' then b.attribute_value END)";

$model = "MAX(CASE WHEN b.attribute_code = 'model' then b.attribute_value END)";

$category = "MAX(CASE WHEN b.attribute_code = 'category' then b.attribute_value END)";

$subcategory = "MAX(CASE WHEN b.attribute_code = 'subcategory' then b.attribute_value END)";

$brandName = 'honda';

$query = Item::selectRaw("a.number, a.description, {$brand} as brand, {$model} as model, {$category} as category, {$subcategory} as subcategory")
        ->from('items as a')
        ->join('attr_maps as b','b.number','=','a.number')
        ->groupBy('a.number')
        ->havingRaw("{$brand} = ?", [$brandName])
        ->orderBy('description')
        ->paginate(10);

return $query;

EDIT: After comments

You can execute for each params like this

$query = Item::selectRaw("a.number, a.description, {$brand} as brand, {$model} as model, {$category} as category, {$subcategory} as subcategory")
    ->from('items as a')
    ->join('attr_maps as b','b.number','=','a.number')
    ->groupBy('a.number')
    ->orderBy('description');

foreach($param as $key => $value) {
     $query = $query->havingRaw("{$$key} = ?", [$value]);
}

$results = $query->paginate(10);

return $results;
Wednesday, September 1, 2021
 
jdehesa
answered 2 Months ago
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