watchdog可以用来输出日志信息到系统的日子报告中
watchdog("radio", "page size:".$page_size);

db_query可以用来执行SQL
$result = db_query("INSERT INTO {my_table}
(name, description, array1, array2)
VALUES ('something', 'something else', '%s', '%s')",
serialize($myarray1), serialize($myarray2)
);