spring-hibernate-mysql實現主從讀寫分離
阿新 • • 發佈:2019-01-11
原文:http://lujia35.iteye.com/blog/969466
介紹下mysql資料庫讀寫分離在spring,hibernate框架下的配置。
1.mysql連線配置檔案jdbc.propertiesmaster.*.*表示主資料庫連線引數,負責增,刪,改;
slave.*.*表示從資料庫連線引數,只負責讀取;
jdbc.properties
Java程式碼
- 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=********
2.配置AOP切面類 DataSourceAdvice.java
Java程式碼
- 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方法執行之前被呼叫
-
public void before(Method method, Object[] args, Object target) throws
- System.out.println("切入點: " + target.getClass().getName() + "類中" + 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("切換到: master");
- DataSourceSwitcher.setMaster();
- }
- else {
- System.out.println("切換到: slave");
- DataSourceSwitcher.setSlave();
- }
- }
- // service方法執行完之後被呼叫
- public void afterReturning(Object arg0, Method method, Object[] args, Object target) throws Throwable {
- }
- // 丟擲Exception之後被呼叫
- public void afterThrowing(Method method, Object[] args, Object target, Exception ex) throws Throwable {
- DataSourceSwitcher.setSlave();
- System.out.println("出現異常,切換到: slave");
- }
- }
資料來源選擇類 DataSourceSwitcher.java
Java程式碼
- 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資料來源動態切換類
Java程式碼
- 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檔案
Xml程式碼
- <?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 />
- <!-- 自動載入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" />
- <!-- 載入properties配置檔案 -->
- <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>
- <!-- 主資料來源-->
- <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>
- <!-- 從資料來源-->
- <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一些引數這裡不寫了</prop>
- </props>
- </property>
- </bean>
- <!-- 切換資料來源 -->
- <bean id="dataSourceAdvice" class="com.company.aop.DataSourceAdvice" />
- <aop:config>
- <aop:advisor
- pointcut="execution(* cn.com.company.service..*Service.*(..))"
- advice-ref