how to make query with substr in eloquent (laravel 4)?

问题

I have this query:

select substr(id,1,4) as id
from meteo.a2012
group by substr(id,1,4)

I just want to take first 4 numbers to my id row, but I'm trying to do in eloquent, how I do?

Thanks.

回答1:

You need to use raw expressions so you can use special functions like that.

Model::select(DB::raw('substr(id, 1, 4) as id'))->groupBy(DB::raw('substr(id, 1, 4)'))->get();

Where Model is your Eloquent model you want to run the query on.

回答2:

$ids = Model::get(['id']);
foreach ($ids as $str)
{
    $str->id =substr($str->id,1,4);
}
return $ids;

来源：https://stackoverflow.com/questions/16626702/how-to-make-query-with-substr-in-eloquent-laravel-4