How can I pass a parameter to a Doctrine2 custom function in the Query Builder select() method?

问题

In my Symfony2 project I am retrieving an ordered set of entity IDs from an Elasticsearch index. I'm then passing this list to Doctrine2 to retrieve the actual entities, by way of a WHERE IN() call.

This doesn't return them in the correct order, so I think I need to use the MySQL-specific FIELD() function. I've created a custom DQL function to allow the functionality.

So now I'm using the following code to build a Doctrine query object, but the parameters aren't being parsed into the select() method:

$itemIds = array(4,8,2,1);

$this->getRepository()
    ->createQueryBuilder('i')
        ->select('i, FIELD(i.id, :ids_string) AS HIDDEN fixed_order')
        ->where('i.id IN (:ids)')
        ->setParameters(array(
            'ids_string' => implode(',', $itemIds),
            'ids' => $itemIds))
        ->orderBy('fixed_order', 'ASC')
    ->getQuery()
;

This fails with the error "Invalid parameter number: number of bound variables does not match number of tokens", so apparently it's not "seeing" the :ids_string in the select() method.

I initially tried putting the FIELD() function in the orderBy() call, but it doesn't look like this is getting parsed for custom DQL function calls, and I imagine I'd run into the same problem as above.

EDIT 1 I'm aware I could put the base data directly into the select() call.

EDIT 2 I've given up and put the bare data into the select() call (which I wanted to avoid). This worked, but then it became necessary to implement Koc's suggestion of using the HIDDEN keyword to prevent Doctrine returning array(Object i, array(fixed_order)) instead of just Object i

回答1:

From Doctrine 2.2 you can use HIDDEN keyword for avability field in order by without hydration them.

Try:

->select('i, FIELD(i.id, :ids_string) AS HIDDEN fixed_order')

回答2:

You're going to kick yourself when you notice the problem...

Try re-reading your sentence: "so apparently it's not "seeing" the :ids_string in the select() method".

And then take a close look at your code: 'id_string' => implode(',', $itemIds)

来源：https://stackoverflow.com/questions/13689095/how-can-i-pass-a-parameter-to-a-doctrine2-custom-function-in-the-query-builder-s