Ehcache学习笔记(二)  根据条件筛选缓存中的数据

 

Ehcache提供了很方便的索引机制，有的时候我们需要根据一些其他的条件对缓存中的数据进行索引，而不是简单根据KEY来进行索引。

 

这是实体类 没什么好说的

package com.epkj.test;import java.util.Date;public class User implements java.io.Serializable {    private int id;        private String name;        private int age;        public int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    private Date brithray;        private double money;    public User() {        super();    }    public User(int id, String name, int age, Date brithray, double money) {        super();        this.id = id;        this.name = name;        this.age = age;        this.brithray = brithray;        this.money = money;    }    @Override    public String toString() {        return this.id + "====" + this.age;    }        public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Date getBrithray() {        return brithray;    }    public void setBrithray(Date brithray) {        this.brithray = brithray;    }    public double getMoney() {        return money;    }    public void setMoney(double money) {        this.money = money;    }}

 

 主要看XML

 

 查询的代码

package com.epkj.test;import java.util.Date;import java.util.List;import net.sf.ehcache.CacheManager;import net.sf.ehcache.Ehcache;import net.sf.ehcache.Element;import net.sf.ehcache.search.Attribute;import net.sf.ehcache.search.Query;import net.sf.ehcache.search.Result;import net.sf.ehcache.search.Results;public class SerachTest {    /**     * @param args     */    public static void main(String[] args) {                CacheManager manager = CacheManager.getInstance();                Ehcache cache = manager.getCache("sampleCache");        //创建测试数据放入缓存        for (int i = 0; i < 50; i++) {            Element element = null;            if(i <= 20) {                element = new Element(i, new User(1, "Txxxxxx" + i, i, new Date(), 3500));            } else {                element = new Element(i, new User(1, "Yxxxxxx" + i, i, new Date(), 3500));            }            cache.put(element);        }                //创建Query接口 用法跟hibernate的Query类似        Query query = cache.createQuery();        //取得属性        Attribute
      
        age = cache.getSearchAttribute("age");                Attribute
       
         name = cache.getSearchAttribute("name");                //可以任务组合查询条件        query.addCriteria(name.ilike("T*").and(age.between(10, 20)));                //根据查询的条件 引入结果集        query.includeValues().end();                Results results = query.execute();                List
        
          list = results.all();                for (Result result : list) {            System.out.println(result.getValue());        }    }}
        
       
      

 

以上是对Ehcache缓存元素的条件查询的一个总结。