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A transaction is a mechanism for grouping a set of statements together as a unit. A transaction should be atomic, consistent, independent, and durable (ACID). Depending on the application, this capability can be extremely important.

From

Cover of Hibernate: A J2EE™ Developer's Guide

Note

事务是用于将一组语句一起分组为一个单元的机制。 事务应该是原子的,一致的,独立的和持久的(ACID)。 根据应用,此功能可能非常重要。