I have a database with some data get by somewhere.
Now i want to export the data to text files. But there can be many data. it can run many minutes.
- I want to start export with one API call. In working state, no another call should can start another export. the export should mark each datarow (with subrows) after exporting
- Another call should ask the export about his state
- At finisch the export, the export should save an with state and notes in the database
I have experimented and my actual code is not stable. Sometimes it break with no output or i get "New transaction is not allowed because there are other threads running in the session." Is there someway a tutorial how to build the scenario?