Spring,Mybatis 整合Memcache

Posted 2020-08-26

Memcached 是一个高性能的分布式内存对象缓存系统，用于动态Web应用以减轻数据库负载。它通过在内存中缓存数据和对象来减少读取数据库的次数，从而提高动态、数据库驱动网站的速度。Memcached基于一个存储键/值对的hashmap。

安装Memcached:

    我在本机安装测用的（windows7  64位）    官网好像没有windows的   附带下载地址http://www.runoob.com/Memcached/window-install-memcached.html   上面也有详细的安装教程。照着来就行、

安装成功开始用了。整合开始：

Memcached配置文件

#设置服务器地址 
memcached.server=127.0.0.1:11211  
#过期时间
memcached.expiration=3600
#容错
memcached.failOver=true  
#设置初始连接数
memcached.initConn=20  
#设置最小连接数 
memcached.minConn=10  
#设置最大连接数 
memcached.maxConn=50  
#设置连接池维护线程的睡眠时间  
memcached.maintSleep=3000  
#设置是否使用Nagle算法（Socket的参数），如果是true在写数据时不缓冲，立即发送出去
memcached.nagle=false  
#设置socket的读取等待超时时间
memcached.socketTO=3000  
#设置连接心跳监测开关
memcached.aliveCheck=true  

　Spring 配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd  
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd  
            http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
                 		                        
	<!-- 自动扫描 -->
	<context:component-scan base-package="com.lin.smmem" />
	
	<!-- 引入配置文件 -->
	<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
            <list>
                <!-- 数据库配置文件 -->
                 <value>classpath*:/application.properties</value> 
            </list>
        </property>
	</bean>
	
	<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
		destroy-method="close">
		<property name="driverClassName" value="${driver}" />
		<property name="url" value="${url}" />
		<property name="username" value="${username}" />
		<property name="password" value="${password}" />
		<!-- 初始化连接大小 -->
		<property name="initialSize" value="${initialSize}"></property>
		<!-- 连接池最大数量 -->
		<property name="maxActive" value="${maxActive}"></property>
		<!-- 连接池最大空闲 -->
		<property name="maxIdle" value="${maxIdle}"></property>
		<!-- 连接池最小空闲 -->
		<property name="minIdle" value="${minIdle}"></property>
		<!-- 获取连接最大等待时间 -->
		<property name="maxWait" value="${maxWait}"></property>
	</bean>

	<!-- spring和MyBatis完美整合，不需要mybatis的配置映射文件 -->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<property name="dataSource" ref="dataSource" />
		<property name="mapperLocations" value="classpath:com/lin/smmem/mapping/*.xml"></property>
		<property name="typeAliasesPackage" value="com.lin.smmem.pojo"/>
        <!-- Mybatis设置属性-->
        <property name="configLocation" value="classpath:mybatisConfiguration.xml"/>
	</bean>

	<!-- DAO接口所在包名，Spring会自动查找其下的类 -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.lin.smmem.dao" />
		<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
	</bean>

	<!-- (事务管理)transaction manager, use JtaTransactionManager for global tx -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource" />
	</bean>
	
	<tx:annotation-driven />
	
</beans>

　mybatis设置属性配置文件 mybatisConfiguration.xml

  

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD SQL MAP Config 3.1//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
	<settings>
		<setting name="callSettersOnNulls" value="true"/>
	</settings>
</configuration>

　OK.接下来写个简单的映射文件：UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.lin.smmem.dao.IUserDao" >

 <!-- 重点主要这里。 -->
  <cache type="org.mybatis.caches.memcached.MemcachedCache" />
  <cache type="org.mybatis.caches.memcached.LoggingMemcachedCache" />
    
  <resultMap id="BaseResultMap" type="User" >
        <id column="id" property="id" jdbcType="INTEGER" />
        <result column="user_name" property="userName" jdbcType="VARCHAR" />
     <result column="password" property="password" jdbcType="VARCHAR" />
     <result column="age" property="age" jdbcType="INTEGER" />
  </resultMap>
  

  
  <sql id="Base_Column_List">
    id, user_name, password, age
  </sql>
  
  
  <select id="selectByPrimaryKey" resultMap="BaseResultMap" useCache="true">
    select 
    <include refid="Base_Column_List" />
    from user.user_t
    where id = #{id,jdbcType=INTEGER}
  </select>
  
  <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
    delete from user.user_t
    where id = #{id,jdbcType=INTEGER}
  </delete>
  
  <!-- 插入 -->
  <insert id="insert" parameterType="com.lin.smmem.pojo.User" >
      insert into user.user_t
      (
          id, 
          user_name, 
          password, 
        age
       )
      values 
      (    
          #{id,jdbcType=INTEGER}, 
          #{userName,jdbcType=VARCHAR}, 
          #{password,jdbcType=VARCHAR}, 
        #{age,jdbcType=INTEGER}
       )
  </insert>
  
  <update id="updateByPrimaryKey" parameterType="com.lin.smmem.pojo.User" >
    update user.user_t
    set user_name = #{userName,jdbcType=VARCHAR},
      password = #{password,jdbcType=VARCHAR},
      age = #{age,jdbcType=INTEGER}
    where id = #{id,jdbcType=INTEGER}
  </update>
  
</mapper>

官方放出了mybatis和memcached的整合包。我们直接用就行。超级简单。在pom.xml加入

<dependency>
    <groupId>org.mybatis.caches</groupId>
    <artifactId>mybatis-memcached</artifactId>
    <version>1.0.0</version>
  </dependency>

 只要在mapper中引入<cache type="org.mybatis.caches.memcached.MemcachedCache" />就可以用了。

 

最后自己写DAO  Service  就可以测试了。