code: public static function appendSet($values, $forceExist = false)
  	{
  		if ($forceExist && !$values)
  			throw new SquidException('SET clause must be present for this type of command!');
  		
  		return Assembly::append('SET', $values, ', ');
  	}
docs: Append set clause.
  @param array $values Expressions of the set clause
  @param bool $forceExist If true, $values must have at least one value
  @return string
  @throws SquidException