[TYPO3-english] DB Backend Caching Framework usage in own extension

[Viktor Livakivskyi]

Hi, List.

I'm trying to enable DB Backend usage in an own extension. Everything works 
as expected, except fact, that cache tables are assumed to be created in 
wrong place...
Let me explain a bit detailed.

As written at wiki [1], I don't need to create tables manually by defining 
ext_tables.sql - the only thing I need, is to define my cache in 
ext_localconf.php
So, I did it, installed extension, but "Database Update" tab doesn't show 
CREATE definitions for my defined cache. I was trying to find the reason, 
and later noticed, that these definitions are contained within "Database 
Update" of totally different extension, which has no relation to mine.

After creation of these tables, cache is visible and I can work with it 
inside of my code - that was ok, but I still was terrifying myself with a 
problem of wrong appearance of db tables creation of my cache, so I tried to 
play'n'test. At the end I made a really simple extension with only 
ext_emconf.php and ext_localconf.php
ext_localconf.php:
<?php
if (!defined('TYPO3_MODE')) {
    die ('Access denied.');
}

if(!isset($TYPO3_CONF_VARS['SYS']['caching']['cacheConfigurations']['px_feuprofile']['backend'])) 
{
    $TYPO3_CONF_VARS['SYS']['caching']['cacheConfigurations']['px_feuprofile']['backend'] 
= 't3lib_cache_backend_DbBackend';
    $TYPO3_CONF_VARS['SYS']['caching']['cacheConfigurations']['px_feuprofile']['options']['compression'] 
= true;
}

?>

And installed it at 'Introduction Package'. As a result, I've got same 
problem: no CREATE definitions at "Database Update" of my ext, but it 
appears at "Database Update" of 'foreigntabletest'...

TYPO3 4.7.4

Am I doing something wrong?


[1]: http://wiki.typo3.org/Caching_framework#t3lib_cache_backend_DbBackend