Spring 会在事务完成时调用 close()，这可能来自提交或回滚.close() 是否真正关闭真正的 JDBC 连接取决于 DataSource 配置.如果它是一个普通的 JDBC 连接，那么它实际上会关闭.如果它是一个连接池，那么它可能会在关闭时返回到池中.

Spring calls close() when the transaction finishes which could be from either a commit or rollback. Whether or not close() actually closes a real JDBC connection depends on the DataSource configuration. If it's a plain JDBC connection, then it will actually close. If it is a connection pool then it will probably just be returned to the pool on close.