tobyink:Your code, as I understand it, when it wants a nested transaction, opens a new database connection, runs the nested transaction there, and holds the transaction open until it's sure the outer transaction is ready to commit. It's a reasonable solution in the case where you're on a database that does transactions but not savepoints.
However, I think it probably has some flaws. You'd typically want code running in an inner transaction to be able to "see" database changes already made in the outer transaction. But if your database is doing ACID properly, then an independent transaction on a second database connection will not be able to see the changes made in the initial transaction until that initial transaction has been committed.
clueless:Thank you for those thoughts. It doesn't require opening a new database connection. No doubt my example was somewhat misleading.
It leaves a lot to be desired as far as ACID is concerned.
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