Mybatis的緩存交給redis管理

Mybatis的緩存交給redis管理

標籤（空格分隔）： Mybatis redis

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前言：

    針對redis的單機版進行緩存設置

一、導入相關jar

二、實現過程

1. 用到jedisUtils工具類

   import redis.clients.jedis.Jedis;
   import redis.clients.jedis.JedisPool;
   import redis.clients.jedis.JedisPoolConfig;
   
   public class JedisUtils {
       private static JedisPool jedisPool;
       static {
           JedisPoolConfig jedisConfig = new JedisPoolConfig();
           jedisConfig.setMaxTotal(100);
           jedisConfig.setMaxIdle(10);
           jedisConfig.setMaxWaitMillis(100);
   
           jedisPool = new JedisPool(jedisConfig, "192.168.0.118", 6379);
       }
   
       public static Jedis getJedis() {
           return jedisPool.getResource();
       }
   
       public static void close(Jedis jedis) {
           jedis.close();
       }
   }

2. 實現Mybatis的Cache

   import java.io.Serializable;
   import java.util.concurrent.locks.ReadWriteLock;
   import java.util.concurrent.locks.ReentrantReadWriteLock;
   
   import org.apache.commons.lang3.SerializationUtils;
   import org.apache.ibatis.cache.Cache;
   
   import com.baizhi.util.JedisUtils;
   
   public class MyBatisCache implements Cache{
   
       private String id;
   
       private ReadWriteLock readWriteLock = new ReentrantReadWriteLock();
   
       public MyBatisCache(String id){
           this.id = id;
       }
   
       public String getId() {
   
           return id;
       }
   
       public int getSize() {
           Long size = JedisUtils.getJedis().dbSize();
   
           return size.intValue();
       }
   
       public void putObject(Object key, Object value) {
           JedisUtils.getJedis().set(SerializationUtils.serialize((Serializable)key), SerializationUtils.serialize((Serializable)value));
       }
   
       public Object getObject(Object key) {
           byte[] bs = JedisUtils.getJedis().get(SerializationUtils.serialize((Serializable)key));
           if(bs == null){
               return null;
           }
           return SerializationUtils.deserialize(bs);
       }
   
       public Object removeObject(Object key) {
           byte[] bs = JedisUtils.getJedis().get(SerializationUtils.serialize((Serializable)key));
           JedisUtils.getJedis().del(SerializationUtils.serialize((Serializable)key));
           return SerializationUtils.deserialize(bs);
       }
   
       public void clear() {
           JedisUtils.getJedis().flushDB();
       }
   
       public ReadWriteLock getReadWriteLock() {
   
           return readWriteLock;
       }
   }
   

3. 開啓Mybatis的全局緩存

   mybatis-config.xml文件

       <?xml version="1.0" encoding="UTF-8"?>
       <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd" >
       <configuration>
           <settings>
               <!-- 開啓全局的緩存 -->
               <setting name="cacheEnabled" value="true"/>
           </settings>
       </configuration>
   

4. 在需要緩存的xxxxmapper.xml中開啓緩存

   <cache type="com.xxxx.cache.mybatis.MyBatisCache"/>
   

5. 一定要將實體進行序列化，因爲緩存的存儲過程中要進行數據的序列化

6. 在spring對SQLSessionFactory的管理中配置

   <!-- 創建SqlSessionFactory -->
   <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
   
       ...
   
       //配置開啓全局的緩存
       <property name="configLocation" value="classpath:mybatis-config.xml"/>
   </bean>