[Typo3-dev] Clear Cache

[Lars Houmark]

Hi Kasper,

Thanks for your reply.

> On typo3.org we had the same problem: The documentation page would
> (and does...) contain thousands of cached instances of the same page.
> So when I made that I introduced the "reg1" field to the cache_pages
> table. The idea was that FROM AN EXTENSION you can set the value of
> "reg1" (for instance to the uid of a tt_news record) and it will be
> stored with the cache version of that record display. That means now
> the page cache could be flushed with "WHERE page_id=[page] AND
> reg1=[uid of tt_news record]".

Very nice! I had my thoughts about the reg1.

> So, *somewhere* in TSFE object you should find an internal variable
> which - if set from your extension - will be stored with the cached
> page. And from your "mod" script you can now flush the cache with this
> in mind.

I will look into the documentation and see if I can find the correct way to 
handle this. It's surely worth spending some time on ;)
I have one other question though. In this current scenario, I've made a 
"mod" script. But for another extension I have a regular backend list of 
records in a sysfolder and editing records is the "normal" way, using the 
TYPO3 core. I made a TS-Config adjustment to the sysfolder holding the 
records, which clears the cache for the pages showing the records. Now I am 
curious to know how I can use the reg1 to make sure, that only the pages 
showing the updated record is being flushed from the cache?

> However: I need to create an API by which you can flush the page cache
> with a function call rather than homemade SQL. This is not fully ready
> yet (except from what Bernhard has pointed out).
>

I think this is a very good idea, as the cache engine might change in 
structure, and that would make my and several other extensions become not 
working.

Regards,


Lars Houmark