The recent migration from Joomla 1.5 to Joomla 1.7 left me without a comments system for the tutorials section of the site. Previously this was handled by Jcomment, a great component that allows you to easily add commenting to standard Joomla articles, its only drawback, is that the Joomla 1.7 version is still some way from release.
After having taken a look at various options, including several other commenting systems, I decided that the best solution would be to import the tutorial articles into EasyBlog, mostly as this would help keep some continuity on the site. The migration of the posts went flawlessly, as expected, but this still left me with the actual comments to migrate. I briefly considered a manual migration, but then discovered that there are actually quite a few comments on the site.
After a bit of digging around I discovered that EasyBlog creates a table that cross references the old article ID's to the new ID's. This is created during the migration process and the values are stored in the '#__easyblog_migrate_content' table. Perfect for migrating the missing comments across.
Using this table I was able to change the object_id in the original jcomments table to match the new post_id for EasyBlog. I simply ran the following SQL statement from within phpMyAdmin. (You will notice that I've made a copy of the original table into the table h0ahq_oldjcomments, just in case.)...