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一、参见hibernate的api
http://tool.oschina.net/apidocs/apidoc?api=hibernate-3.6.10
http://tool.oschina.net/apidocs/apidoc?api=hibernate-4.1.4
说明：贴出两个版本的原因在于FlushMode属性在3.6与4.1版本的设置有所不同，3.6的FlushMode属性是一个Class类，而4.1已更换了Enum。
二、 FlushMode属性
在org.hibernate Class FlushMode中这样解释它的作用：Represents a flushing strategy. The flush process synchronizes database state with session state by detecting state changes and executing SQL statements.
代表一个flushing（译作刷新或清空似乎都不合适，暂理解为刷新）的策略，它将通过改变session的状态和执行SQL的状态来处理线程中的数据。
static FlushMode |
ALWAYS The Session is flushed before every query. |
static FlushMode |
AUTO The Session is sometimes flushed before query execution in order to ensure that queries never return stale state. |
static FlushMode |
COMMIT The Session is flushed when Transaction.commit() is called. |
static FlushMode |
MANUAL The Session is only ever flushed when Session.flush() is explicitly called by the application. |
static FlushMode |
NEVER Deprecated. use MANUAL instead. |
FlushMode属性有五个，分别是：
..
鸣谢：http://blog.csdn.net/accpsz/article/details/6010618
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原文地址：http://www.cnblogs.com/wql025/p/4822791.html
