连接池上的事务控制

Question

我有一个多线程应用程序，其中正在解析文件并将其插入数据库中-我有一个用于写入数据库的数据库连接池-我需要对解析/写入整个操作添加事务控制，即在解析过程中出现任何错误的情况下/ db-insert操作，我想回滚需要回滚我的部分db写操作的整个操作-有什么方法可以做到这一点？

Answer 1

You'll need to take the connection out of the pool, start the database transaction on it, and keep it out of the pool for the duration of the transaction. You'll only return it back to the pool once you finish (commit or rollback) the transaction.

This obviously means that you cannot run more transactions in parallel than you have connections in your pool. If you cannot accept this limitation, you'll have to devise your own workaround that doesn't rely on database transactions (eg using a "stage" table that accepts data with some unique identifier, then moving it into the main storage at once, plus a task to delete stale data).

I recommend reading on Spring's transaction manager for an inspiration.

Answer 2

If I understand it correctly you have an application which split the file into several parts, each part is parsed by a different thread and each uses its own connection from the pool.

I think the transaction manager could help here if you are fine to use XA transactions. Each of the connection would form a separate transaction branch thus each of the thread would then work on a separate participant of the transaction. At the end, 2PC would ensure to get all committed or rolled-back.