Question

I’m working on a project to add statistics for pageviews. I’m having trouble looking up and then storing in MySQL from PHP.

I have users stored in the database as:

ID   Email_Address      Visits
1    [e-mail]  NULL
2    [e-mail]  NULL

A variable is passed into the page called $ID which refers to which user has been visited.

Firstly, should the Visits column be a default of 0 rather than NULL?

Secondly, What query can I then use to go something like;

Lookup $ID, add 1 to Visits in that row. ie: Visits = Visits + 1?
Also if $ID is blank, it shouldn’t do anything.

Cheers

Answer 1

Yes, it should be default of 0.

UPDATE `your-table` 
   SET `Visits` = `Visits` + 1
 WHERE `ID` = :id

If the id is blank, don’t run the query.