  def self.get_condtions_for(user, mail_account_ids)

    SqlHelper.validate_token([mail_account_ids])

    if mail_account_ids.nil? or mail_account_ids.empty?
      return "(user_id=#{user.id} and (mail_account_id is null))"
    else
      return "(user_id=#{user.id} and (mail_account_id is null or mail_account_id in (#{mail_account_ids.join(',')})))"
    end
  end
The software constructs all or part of an SQL command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended SQL command when it is sent to a downstream component.