Spring+Hibernate框架下Mysql读写分离、主从数据库配置

介绍下mysql数据库读写分离在spring,hibernate框架下的配置。
1.mysql连接配置文件jdbc.properties
master.*.*表示主数据库连接参数，负责增，删，改；
slave.*.*表示从数据库连接参数，只负责读取；

jdbc.properties

master.jdbc.driverClassName=com.mysql.jdbc.Driver
master.jdbc.url=********
master.jdbc.username=********
master.jdbc.password=********

slave.jdbc.driverClassName=com.mysql.jdbc.Driver
slave.jdbc.url=********
slave.jdbc.username=********
slave.jdbc.password=********

把**改成你所需的连接参数；

2.配置AOP切面类 DataSourceAdvice.java

import java.lang.reflect.Method;
import org.springframework.aop.AfterReturningAdvice;
import org.springframework.aop.MethodBeforeAdvice;
import org.springframework.aop.ThrowsAdvice;

import com.company.datasource.DataSourceSwitcher;

public class DataSourceAdvice implements MethodBeforeAdvice, AfterReturningAdvice, ThrowsAdvice {
	// service方法执行之前被调用
	public void before(Method method, Object[] args, Object target) throws Throwable {
		System.out.println("切入点: " + target.getClass().getName() + "类中" + method.getName() + "方法");
		if(method.getName().startsWith("add") 
			|| method.getName().startsWith("create")
			|| method.getName().startsWith("save")
			|| method.getName().startsWith("edit")
			|| method.getName().startsWith("update")
			|| method.getName().startsWith("delete")
			|| method.getName().startsWith("remove")){
			System.out.println("切换到: master");
			DataSourceSwitcher.setMaster();
		}
		else  {
			System.out.println("切换到: slave");
			DataSourceSwitcher.setSlave();
		}
	}

	// service方法执行完之后被调用
	public void afterReturning(Object arg0, Method method, Object[] args, Object target) throws Throwable {
	}

	// 抛出Exception之后被调用
	public void afterThrowing(Method method, Object[] args, Object target, Exception ex) throws Throwable {
		DataSourceSwitcher.setSlave();
		System.out.println("出现异常,切换到: slave");
	}

}

数据源选择类 DataSourceSwitcher.java

package com.company.datasource;
import org.springframework.util.Assert;

public class DataSourceSwitcher {
	@SuppressWarnings("rawtypes")
	private static final ThreadLocal contextHolder = new ThreadLocal();

	@SuppressWarnings("unchecked")
	public static void setDataSource(String dataSource) {
		Assert.notNull(dataSource, "dataSource cannot be null");
		contextHolder.set(dataSource);
	}

	public static void setMaster(){
		clearDataSource();
    }
	
	public static void setSlave() {
		setDataSource("slave");
	}
	
	public static String getDataSource() {
		return (String) contextHolder.get();
	}

	public static void clearDataSource() {
		contextHolder.remove();
	}
}

DynamicDataSource.java数据源动态切换类

package com.company.datasource;

import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;

public class DynamicDataSource extends AbstractRoutingDataSource {

	@Override
	protected Object determineCurrentLookupKey() {
		return DataSourceSwitcher.getDataSource();
	}

}

下面配置spring applicationContext.xml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:aop="http://www.springframework.org/schema/aop"
	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans 
		http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/tx 
		http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
		http://www.springframework.org/schema/aop 
		http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.0.xsd">

	<context:annotation-config />
	<!-- 自动加载SERVICE DAO ACTION -->
	<context:component-scan base-package="cn.com.company.dao.*" />
	<context:component-scan base-package="cn.com.company.service.*" />
	<context:component-scan base-package="cn.com.company.action" />

	<!-- 加载properties配置文件 -->
	<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
		<property name="locations">
			<list>
				<value>classpath:jdbc.properties</value>
			</list>
		</property>
	</bean>

	<bean id="parentDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
		//***c3p0配置
	</bean>
     <!-- 主数据源-->
	<bean id="masterDataSource" parent="parentDataSource">
		<property name="driverClass" value="${master.jdbc.driverClassName}" />
		<property name="jdbcUrl" value="${master.jdbc.url}" />
		<property name="user" value="${master.jdbc.username}" />
		<property name="password" value="${master.jdbc.password}" />
	</bean>
    <!-- 从数据源-->
	<bean id="slaveDataSource" parent="parentDataSource">
		<property name="driverClass" value="${slave.jdbc.driverClassName}" />
		<property name="jdbcUrl" value="${slave.jdbc.url}" />
		<property name="user" value="${slave.jdbc.username}" />
		<property name="password" value="${slave.jdbc.password}" />
	</bean>

	<bean id="dataSource" class="com.company.datasource.DynamicDataSource">
		<property name="targetDataSources">
			<map key-type="java.lang.String">
				<entry key="slave" value-ref="slaveDataSource" />
			</map>
		</property>
		<property name="defaultTargetDataSource" ref="masterDataSource" />
	</bean>

	<!-- 配置sessionFactory -->
	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
		<property name="dataSource" ref="dataSource"></property>
		<property name="packagesToScan" value="cn.com.company.entity" />
		<property name="hibernateProperties">
			<props>

				<prop>//***hibernate一些参数这里不写了</prop>
			</props>
		</property>
	</bean>
	
	<!-- 切换数据源 -->
	<bean id="dataSourceAdvice" class="com.company.aop.DataSourceAdvice" />
	<aop:config>
		<aop:advisor
			pointcut="execution(* cn.com.company.service..*Service.*(..))"
			advice-ref="dataSourceAdvice" />
	</aop:config>
	
	<!-- 配置事务管理器 -->
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory">
			<ref bean="sessionFactory" />
		</property>
	</bean>
	<!--配置事务的传播特性 -->
	<tx:advice id="txAdvice" transaction-manager="transactionManager">
		<tx:attributes>
			<!-- 对增、删、改方法进行事务支持 -->
			<tx:method name="add*" propagation="REQUIRED" />
			<tx:method name="create*" propagation="REQUIRED" />
			<tx:method name="save*" propagation="REQUIRED" />
			<tx:method name="edit*" propagation="REQUIRED" />
			<tx:method name="update*" propagation="REQUIRED" />
			<tx:method name="delete*" propagation="REQUIRED" />
			<tx:method name="remove*" propagation="REQUIRED" />
			<!-- 对查找方法进行只读事务 -->
			<tx:method name="loadByUsername*" propagation="SUPPORTS" read-only="true" />
			<!-- 对其它方法进行只读事务 -->
			<tx:method name="*" propagation="SUPPORTS" read-only="true" />
		</tx:attributes>
	</tx:advice>
	<!--那些类的哪些方法参与事务 -->
	<aop:config>
		<aop:advisor
			pointcut="execution(* cn.com.company.service..*Service.*(..))"
			advice-ref="txAdvice" />
		<aop:advisor
			pointcut="execution(* cn.com.company.service..*ServiceImpl.*(..))"
			advice-ref="txAdvice" />
	</aop:config>
	
	
</beans>

！注 applicationContenxt.xml中
<!-- 切换数据源 -->
<bean id="dataSourceAdvice" class="com.company.aop.DataSourceAdvice" />
<aop:config>
<aop:advisor
pointcut="execution(* cn.com.company.service..*Service.*(..))"
advice-ref="dataSourceAdvice" />
</aop:config>
一定要配置在事务AOP之上

评论

4 楼 wfj_god_father 2016-04-26  

测试过  实现不了读写分离 不知道错在哪里 get数据源时总是在set数据源之前执行 求赐教

3 楼 coldsky 2013-09-27  

嗯。找了好久了，不错的东东，我收藏一下。

2 楼 rockyxiaogang 2011-03-21  

嗯。找了好久了，不错的东东，我收藏一下。

1 楼 pxchen 2011-03-21  

sfsfsf