Method: Add order by order SQL clause.

Method: Returns customer subquery to be used in WHERE SQL query, based on query arguments from the user.

Method: Returns logic operator for WHERE subclause based on ‘match’ query argument.

Method: Returns filtered comma separated ids, based on query arguments from the user.

Method: Returns comma separated ids of allowed variations, based on query arguments from the user.

Method: Returns comma separated ids of excluded products, based on query arguments from the user.

Method: Returns comma separated ids of included categories, based on query arguments from the user.

Method: Returns comma separated ids of included coupons, based on query arguments from the user.

Method: Returns comma separated ids of excluded coupons, based on query arguments from the user.

Method: Returns comma separated ids of included orders, based on query arguments from the user.