Laravel Query Builder Update with Increment

问题

Hi I need to fix my query where I will need to update my product quantity with just incrementing it, here is my code with sample.

    DB::table('product_warehouse')
    ->where('product_id', $product_id)
    ->where('warehouse_id', $warehouse_id)
    ->update(['product_qty' => $old_qty+$product_qty]);

回答1:

You can try both ways:

DB::table('product_warehouse')
    ->where('product_id', $product_id)
    ->where('warehouse_id', $warehouse_id)
    ->update(['product_qty' => DB::raw('product_qty + ' . $product_qty)]);

Or

DB::table('product_warehouse')
    ->where('product_id', $product_id)
    ->where('warehouse_id', $warehouse_id)
    ->increment('product_qty', $product_qty);

来源：https://stackoverflow.com/questions/45951180/laravel-query-builder-update-with-increment