将时间戳添加到数据库表

Question

I have an html/php form that updates entries on the database server. I need to add a field to each row indicating when that entry is added, so in other words a timestamp of when the entry was created. I have been searching and found this:

http://www.createafreewebsite.net/phpmysql/alter.html

Would I do something like:

$timestamp = time();
mysql_query("ALTER TABLE notification
ADD timestamp CHAR(30) AFTER names);

mysql_query("INSERT INTO notification (`timestamp`) values ('$timestamp');

is this the correct way to approach it, and am I using the correct datatype? I would need to compare the timestamp with another timestamp generated from a javascript file later on. For example, if timestamp1 is smaller than timestamp2 than perform following functions...

Any information would be helpful, thanks!

EDIT:

Provided information as requested:

So far I have:

mysql_query("INSERT INTO notification (`program`, `month`, `day`, `year`, `sponsor`, `type`, `category`, `range`, `desc`) values ('$pName' ,  '$month' , '$day' , '$year' , '$sponsor' , '$type' , '$category' , '$range' , '$desc')");

Answer 1

time() in PHP will produce a timestamp, your MySQL table might be expecting another format, so you can just do:

mysql_query("INSERT INTO notification (`timestamp`) values (NOW());

and it will work with date and datetime fields too.

Even though your table is CHAR(30) you still have one less variable to use.

Of if you change your column data type to TIMESTAMP then you can use on update CURRENT_TIMESTAMP to fill the table cell for you.