Question

Database:

Table: news

With the columns: Unique and Primary Key which auto increments called ID, content and title

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Code:

-> Creates a form with a textfield, where the user can put in his value for the ID and thus the position of the item

$form->textField("Position of the item item", "id", false, 30, false, getIfExists("id", $originalValues));

-> Posts the new ID as a query to the database

$queryvalues["id"]       = $_POST[ "id" ];

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It works when I post an ID that isn’t in use by another item. However, if I try to overwrite an ID, it gives me an error and doesn’t change anything. Obviously, I’d need to update the IDs, so that it’ll increment all the conflicting IDs and thus allowing the edited ID to be posted.

I’m kinda annoyed as how to be doing this. I had the idea of adding an index number that defines the position, then switched to sorting the list with the database ID and changing the ID in the CMS will be able to update that whenever the user of the CMS wishes.

However, I’m not too sure how to approach this and whether there is a better option/solution.

Does anyone have any ideas/tips/hints?

I’ve tried using ON DUPLICATE KEY UPDATE, but I’m having no luck with it so far.

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EDIT:

Alright, so ordering works now. I made a new column called Position and just used that to order the items with and it works fine.

However, if I add a new item, with a same position, it’ll put it under the other position. So basically the New “0” gets listed under the old “0”, while sharing the same key. Any suggestions on how to fix this? I was thinking of incrementing the old duplicate key. But have no idea how this would work exactly.

Answer 1

I understand that you want to use the ID to ordering your items : don’t do that.

Instead, add a new columns named “ordering” :

• When INSERT-ing an item, set this field value to the ID value
• When UPDATE-ing the item position, swap the position value between the two items that are moving