How can I convert a MySQL multi-statement query to Laravel Eloquent?

Converting MySQL Multi-Statement Query to Laravel Eloquent

Consider the following MySQL query:

SELECT<br>  GROUP_CONCAT(DISTINCT</p>
<pre class="brush:php;toolbar:false">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;

The challenge lies in converting this query to Laravel Eloquent, especially considering the various statements: PREPARE, EXECUTE, SET, and DEALLOCATE.

Solution:

The conversion largely involves raw queries:

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

Here's a more detailed implementation:

DB::table('item_details')->selectRaw('GROUP_CONCAT(...) INTO @sql')->get();<br>$sql = DB::selectOne('select @sql')->{'@sql'};<br>ItemDetails::select('item_number', DB::raw('SUM(quantity) as total_quantity'))</p>
<pre class="brush:php;toolbar:false">->selectRaw($sql)
->groupBy('item_number')
->get();

This approach effectively handles the conversion from the original MySQL query to Laravel Eloquent, utilizing a combination of raw queries and Eloquent methods.

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