How to Convert Complex MySQL Multi-Statement Queries to Laravel Eloquent?

Converting MySQL Multi-Statement Query to Laravel Eloquent

In a MySQL query, you may encounter complex multi-statement queries involving various operations like SET, PREPARE, EXECUTE, and DEALLOCATE. Converting such queries to Laravel Eloquent can be challenging.

Solution

Laravel Eloquent cannot execute multiple statements or perform low-level operations like DEALLOCATE. Therefore, we must break down the query into its individual components and execute them separately.

First, execute the GROUP_CONCAT query:

<code class="php">$concatResult = DB::table('item_details')
    ->selectRaw('GROUP_CONCAT(...) INTO @sql')
    ->get();</code>

Retrieve the value assigned to the @sql variable:

<code class="php">$sql = DB::selectOne('select @sql')->{'@sql'};</code>

Finally, compose and execute the remaining query in Eloquent:

<code class="php">ItemDetails::select('item_number', DB::raw('SUM(quantity) as total_quantity'))
    ->selectRaw($sql)
    ->groupBy('item_number')
    ->get();</code>

This solution breaks down the MySQL multi-statement query into manageable chunks that can be executed separately in Laravel Eloquent, achieving the same result as the original query.

The above is the detailed content of How to Convert Complex MySQL Multi-Statement Queries to Laravel Eloquent?. For more information, please follow other related articles on the PHP Chinese website!