Topic: upgrade tag in manifest.xml - not loosing existing data in DB

upgrade tag in manifest.xml

if(!defined('EXT_CUR_VERSION'))
{
//extension not installed
}
else
{
//probably an upgrade
}

where is the documentation for how to make extensions so that if someone is upgrading it doesn't kill previous data? is it right pun poll etc have this problem?

thanks.

2

Re: upgrade tag in manifest.xml - not loosing existing data in DB

Have you looked in the Wiki?

Re: upgrade tag in manifest.xml - not loosing existing data in DB

Did you find it in the Wiki? Link?
I didn't....