在 Laravel 中，如何将参数绑定到另一个查询中的查询构建器 DB raw 中的查询？

Question

I have two queries that I'm building:

$color = \DB::table('colors')->take(10)->orderBy('id', 'desc');

if(isset($between)){
    $color->whereBetween('id', [$start, $end]);
}

$flavor = \DB::table(\DB::raw('(' . $color->toSql() . ') as color'))
               ->join('flavor', 'flavor.color_id', '=', 'color.id')
               ->select('color.id', 'color.name', 'flavor.name');

return $flavor->get();

I need to bind 2 values in the first query only IF there is a $between set. And it has to be inside that \DB::raw .

How do I do that?

PS if I run the first query separately it works perfectly. But when I try to run the whole query at once I'm getting General error 2031 (basically the parameters are not bind).

Answer 1

You could try merging the bindings from the first query into the second query before executing it:

$flavor->mergeBindings($color);

Or just the binding without the 'type' of the bindings:

$flavor->addBinding($color->getBindings());

The second one should work because you only have a binding for a where which is the default type for addBinding . For more advanced queries with other bindings you probably want to go the way of merging the bindings so the 'type' of the binding is accurate.

Answer 2

Firstly, change your DB::table('color') to your Model name like

Color::take(10)->orderBy('id', 'desc')

Secondly, add

->mergeBindings($color->getQuery)

Something like this:

use App\Models\Color;
...
$color = Color::take(10)->orderBy('id', 'desc');

if(isset($between)){
    $color->whereBetween('id', [$start, $end]);
}

$flavor = \DB::table(\DB::raw('(' . $color->toSql() . ') as color'))
               ->mergeBindings($color->getQuery())
               ->join('flavor', 'flavor.color_id', '=', 'color.id')
               ->select('color.id', 'color.name', 'flavor.name');


return $flavor->get();