Question

Ok, i have a checklist system that i am working on. There is a page that pulls data from the database and displays it as a checklist. I am trying to create a button that when pushed will reset the database to a certain state that i want. Basically, i have a button that sends an ajax callout to a php page that executes an UPDATE query. This query is as follows:

UPDATE $table SET value='$value', comments='$comments', editedBy='$editedBy', editedDate='$editedDate' WHERE projectId='$projectId';

I set the variables first of course, that’s not my question. Just pretend they have data. My question is how can i repeat this query so that every row table x that has a projectId of n is updated? I’m guessing this involves a for loop?

SIDE NOTE: Since this query is just setting the value to false and making the comments, editedBy, and editedDate fields blank for every row in table x that has a projectId of n, is there a better way of doing this other than the UPDATE query?

Thanks for any help!

Answer 1

As long as you don’t sepcify a LIMIT in your UPDATE query, it will update every row it finds that satisfies your where clause.

Now, if you’re updating the projects table and projectID is your primary key, you’ll need to run a loop to update other projectIDs. If you’re not updating the project table, then your update query will update any record that has a foreign key match to the project ID you specified.

Does that help?