Request for CheckBox multiple choice

I had a choice list I changed it by a checkbox for multiple choice. This following my old request MySQL:

 $this->_sqlWhere.="`piecearticles`.`ID_Article`=`article`.`ID_Article` 
 AND `article`.`ID_LRU`=`lru`.`ID_LRU` AND `lru`.`LRU`='" . $this->_lru . "'";

Since I changed to a multiple choice,should I change it or this one it's fine ? Thank you.