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+--- Thread: Update Row Value If Another Row is Deleted (/showthread.php?tid=75385)
Update Row Value If Another Row is Deleted - GregS - 01-31-2020
Hello.
The app I am building has a ranking system. Nothing fancy, just 1st, 2nd, 3rd. Is there any possible way using CodeIgniter, I could update values in the other rows based on the row that is deleted?
So, If for example, I delete 1st place from the table, 2nd would become 1st and 3rd would become 2nd.
I have started trying to build a formula in PHP using the rows Rank Value and the number of rows in the table, but it is proving quite challenging and I was just wondering if there is a simpler way using a CodeIgniter feature. I did try a Google search but I could not see any results that mention anything.
Thank you for any help.
RE: Update Row Value If Another Row is Deleted - includebeer - 02-01-2020
After you delete a row, you can update the other rows where the rank is higher. You just need to know what rang was deleted. Something like this:
Code:
UPDATE SOMETABLE SET RANK = RANK + 1 WHERE RANK > ?You can do this in your code, or with a database trigger, or if you use CI4, with a model event (before delete or after delete): https://codeigniter4.github.io/userguide/models/model.html#event-parameters
RE: Update Row Value If Another Row is Deleted - GregS - 02-02-2020
(02-01-2020, 03:00 PM)includebeer Wrote: After you delete a row, you can update the other rows where the rank is higher. You just need to know what rang was deleted. Something like this:
Code:UPDATE SOMETABLE SET RANK = RANK + 1 WHERE RANK > ?
You can do this in your code, or with a database trigger, or if you use CI4, with a model event (before delete or after delete): https://codeigniter4.github.io/userguide/models/model.html#event-parameters
This works perfectly!, Thank you so much for the help!