	function getTextColumns($table) {
		$sql = "SHOW COLUMNS FROM " . $this->prefix.$table . " WHERE type = 'text' OR type like 'varchar%'";
		$res = @mysqli_query($this->connection, $sql);
		if ($res == null)
            return array();
		$records = array();
		while($row = mysqli_fetch_object($res)) {
			$records[] = $row->Field;
		}

		return $records;
	}
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.