How to update column with null value

Question

I am using mysql and need to update a column with a null value. I have tried this many different ways and the best I have gotten is an empty string.

Is there a speci

Answer 1

On insert we can use

$arrEntity=$entity->toArray();        
    foreach ($arrEntity as $key => $value) {    
        if (trim($entity->$key) == '' && !is_null($entity->$key) && !is_bool($entity->$key)){
        unset($entity->$key);
        }
    }

On update we can use

$fields=array();
foreach ($fields as $key => $value) {
        if (trim($value) == '' && !is_null($value) && !is_bool($value)){
            $fields[$key] = null;
        }
    }