Well, the upgrade seems to be impossible. I tried deleting the published issue in the journal, but this did not improve anything. Just shortened the Error message to:
A database error has occurred: Duplicate entry '7' for key 1
So, I created a new mysql database "database2" and I was able to install ojs 2.4.1 with a new storage folder outside ojs "store2". So basically on my site I have two ojs systems installed using separate mysql databases and separate storage folders. The ojs 2.3.7 is installed in folder /ojs whereas ojs 2.4.1 is installed in another folder /ojs-241. I can open in parrallel both ojs installations in two different browser windows, so that I can manually synchronize their content after logging in in both ojs's as admin.
Because at this time I have only 1 published issue, I would like to migrate the pdfs, etc. manually, i.e. submit, skip review, directly accept and publish. My question is this: If I export all user connected tables e.g. "users", "users settings" etc. from the mysql database operating with ojs-237, will it work if I import them into the mysql database operating with ojs-241. The purpose is to save the discomfort of re-registration for my current users. I will be glad to have advice on proper way to migrate user accounts only without their submissions.
Last edited by dankomed
on Sun Dec 16, 2012 5:08 am, edited 2 times in total.