MS-SQL快照隔离和休眠行为

Question

My doubt is relating to the behaviour of Snapshot isolation in SQLserver 2008 and its corresponding configuration in hibernate

I am referring to the following link

Step1: To enable snapshot isolation I have to run the following statements in the database:

ALTER DATABASE MyDatabase
SET ALLOW_SNAPSHOT_ISOLATION ON

ALTER DATABASE MyDatabase
SET READ_COMMITTED_SNAPSHOT ON

Step2: And I set the following property in hibernate.cfg.xml

<!-- Hibernate Isolation Level [READCOMMITED SNAPSHOT ISOLATION]-->    
<property name=”hibernate.connection.isolation”>4096</property>

What I have observed is that, when I omit Step2 from the configuration file, the snapshot isolation does not work in my java program.

Since the isolation level is set in the Database, shouldn't it work irrespective of the hibernate configuration ?

Answer 1

因为它设置了JDBC事务隔离级别。

Answer 2

See this link:

(Queries have to do this explicitly– as in run a command 'SET TRANSACTION ISOLATION LEVEL SNAPSHOT', or have it set in their connection string.)