Configuring Hibernate Level Two Cache

First find the jar Packages You need to add to configure Ehcahe level two cache

hibernate-release-4.1.9.final→lib→ Ehcache-core-2.4.3.jar and Hibernate-ehcache-4.1.9.final.jar under optional→ehcache→ and slf4j-api-1.6.1.jar!.

Then from hibernate-release-4.1.9.final→project→etc→ copy the ehcache.xml to the src directory . put the cache . XML It's useless, it's all erased. , leave the final :

<ehcache>

<!-- Cache path --

<diskstore path= "E:\SecondCache"/>// self-configuration

<defaultcache

Maxelementsinmemory= "10000"

Eternal= "false"

Timetoidleseconds= "120"

Timetoliveseconds= "120"

Overflowtodisk= "true"

/>

</ehcache>

Then open and configure the cache in Hibernate.cfg.xml :

<!-- Turn on level two cache--

<property name= "Hibernate.cache.use_second_level_cache" >true</property>

<!--cache Provider--

<property name= "Hibernate.cache.region.factory_class" >

Org.hibernate.cache.ehcache.EhCacheRegionFactory

</property>

Finally, the cache is set in the XML file of the entity class : <cache usage= "Read-write"/>

such as :

<class name= "Cn.jnit.bean.User" table= "T_user" >

<cache usage= "Read-write"/>

<id name= "id" >

<generator class= "Sequence" >

</generator>

</id>

<property name= "pwd" ></property>

<property name= "Name" ></property>

<one-to-one name= "ud" class= "Cn.jnit.bean.UserDetail" cascade= "All" ></one-to-one>

</class>

If the query is a collection : You also need to set it in <SET> :

<class name= "cn.jbit.bean.Dept" table= "Dept" >

<cache usage= "Read-write"/>

<id name= "Deptno" >

<generator class= "sequence" ></generator>

</id>

<property name= "Dname" ></property>

<property name= "Loc" ></property>

<set name= "Emps" cascade= "Save-update" inverse= "true" order-by= "Empno desc"

Lazy= "false" >

<cache usage= "Read-only"/>

<key column= "Deptno" ></key>

<one-to-many class= "Cn.jbit.bean.Emp"/>

</set>

</class>

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

If there is no <set> in the configuration file, and you do not have to set the query statement optimization , you need to open the query cache →<!- - Open Query cache --

<property name= "Hibernate.cache.query_cache_factory" >true</property>

Here is the data I tested in a one-to-two relationship , remember :

Not iterator<user> iterator=ses.createquery (HQL). Setcacheable (True). List (). iterator ();

Iterator<user> iterator=ses.createquery (HQL). Setcacheable (True). Iterate ();

Session ses=hibernatesessionfactory.getsession ();

String hql= "from User";

list<user> list = Ses.createquery (HQL). Setcacheable (True). List ();

System.out.println (List.size ());

Hibernatesessionfactory.closesession ();

Ses=hibernatesessionfactory.getsession ();

iterator<user> Iterator = Ses.createquery (HQL). Setcacheable (True). Iterate ();

while (Iterator.hasnext ()) {

User user = (user) iterator.next ();

System.out.println (User.getid ());

}

Ses.close ();

Configuring Hibernate Level Two Cache