ehcache-永久缓存

Question

I am beginner to Ehcache.

I am trying to do cache SQL query result via mybatis xml and ehcache is caching the query with its result, but it clears the cached data once the operation gets completed even the same JVM instance is running.

Can anyone advise how to store the cache either in disk/memory till JVM termiates?

Code snippet of mybatis-mapper.xml

<cache type="org.mybatis.caches.ehcache.EhcacheCache">
    <property name="eternal" value="false" />
    <property name="maxElementsInMemory" value="100000" />
    <property name="timeToIdleSeconds" value="3600" />
    <property name="timeToLiveSeconds" value="3600" />
    <property name="memoryStoreEvictionPolicy" value="LFU" />
    <property name="statistics" value="true" />
</cache>

.....

Answer 1

您正在寻找的是Ehcache Persistence

Answer 2

Not a specialist of the MyBatis - Ehcache bridge. But from your configuration sample, assuming you never want expiry, do the following changes:

• eternal property to be set to true
• Remove the two timeToXXX properties

This will make sure expiry never gets triggered. Note though that a cache can still evict to control resource consumption.

Answer 3

In order to fixing this issue, we need to explicitly mention the below attributes in the your mapper.xml 1) useCache="true" and flushCache="false" for select operation 2) flushCache="false" for all your insert/update/delete operation

Sample code snippets:-

<select id="getTestData" parameterType="map" resultMap="testDtls"  useCache="true" flushCache="false" >

<insert id="insertTestData" parameterType="map" flushCache="false" >