I have many question to post because I returned to Cobol years later. The most important question regards the database pre-compiler. In particular:
1) With EXEC SQL Can I set isolation level and begin transaction ?
2) How Can I test if an insert or updated does not succeed because of constraints violations?
3) If I set autocommit disabled in SQl properties can I use commit and rollback ?
4) To set a null value it is sufficient move -1 to :name-fileld-null ?