spring mvc结合mybaits，多数据源切换!

港控/mmm° 2022-08-01 06:02 168阅读 0赞

最近项目中用到多类型数据库，多库问题，然后有点懵了，自己试着做了个数据源切换的demo，不啰嗦了，上过程！首先spring和mybaits整合的过程我就不多说了，先看applicationContext.xml:

<?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:cache="http://www.springframework.org/schema/cache"
 	xmlns:context="http://www.springframework.org/schema/context"
 	xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:jee="http://www.springframework.org/schema/jee"
 	xmlns:jms="http://www.springframework.org/schema/jms" xmlns:lang="http://www.springframework.org/schema/lang"
 	xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:oxm="http://www.springframework.org/schema/oxm"
 	xmlns:p="http://www.springframework.org/schema/p" xmlns:task="http://www.springframework.org/schema/task"
 	xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util"
 	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.1.xsd 
 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.1.xsd 
 http://www.springframework.org/schema/cache http://www.springframework.org/schema/cache/spring-cache-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/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.1.xsd 
 http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee-3.1.xsd 
 http://www.springframework.org/schema/jms http://www.springframework.org/schema/jms/spring-jms-3.1.xsd 
 http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang-3.1.xsd 
 http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd 
 http://www.springframework.org/schema/oxm http://www.springframework.org/schema/oxm/spring-oxm-3.1.xsd 
 http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.1.xsd 
 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.1.xsd 
 http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.1.xsd">
 
 	<bean class="com.shangyon.ppa.utils.SpringUtil"></bean>
 
 	<bean
 		class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
 		<property name="locations">
 			<value>classpath:jdbc.properties</value>
 		</property>
 	</bean>
 
 	
 	<bean id="sqlServerDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
 		destroy-method="close">
 		<property name="driverClass" value="${jdbc.sqlserver.driverclass}"></property>
 		<property name="jdbcUrl" value="${jdbc.sqlserver.url}"></property>
 		<property name="user" value="${jdbc.sqlserver.username}"></property>
 		<property name="password" value="${jdbc.sqlserver.password}"></property>
 		<property name="initialPoolSize" value="3"></property>
 		<property name="minPoolSize" value="3"></property>
 		<property name="maxPoolSize" value="15"></property>
 		<property name="acquireIncrement" value="3"></property>
 		<property name="maxStatements" value="0"></property>
 		<property name="maxStatementsPerConnection" value="5"></property>
 		<property name="maxIdleTime" value="1800"></property>
 	</bean>
 
 	<bean id="mySqlDataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
 		destroy-method="close">
 		<property name="driverClass" value="${jdbc.mysql.driverclass}"></property>
 		<property name="jdbcUrl" value="${jdbc.mysql.url}"></property>
 		<property name="user" value="${jdbc.mysql.username}"></property>
 		<property name="password" value="${jdbc.mysql.password}"></property>
 		<property name="initialPoolSize" value="3"></property>
 		<property name="minPoolSize" value="3"></property>
 		<property name="maxPoolSize" value="15"></property>
 		<property name="acquireIncrement" value="3"></property>
 		<property name="maxStatements" value="0"></property>
 		<property name="maxStatementsPerConnection" value="5"></property>
 		<property name="maxIdleTime" value="1800"></property>
 	</bean>
 
 	
 	<bean id="multipleDataSource" class="com.shangyon.ppa.data.MultipleDataSource">
 		<property name="defaultTargetDataSource" ref="mySqlDataSource" />
 		<property name="targetDataSources">
 			<map>
 				<entry key="mySqlDataSource" value-ref="mySqlDataSource" />
 				<entry key="sqlServerDataSource" value-ref="sqlServerDataSource" />
 			</map>
 		</property>
 	</bean>
 	
 	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
 		<property name="dataSource" ref="multipleDataSource" />
 		<property name="typeAliasesPackage" value="com.shangyon.ppa.bean.model">
 		</property>
 
 		<property name="mapperLocations"
 			value="classpath*:com/shangyon/ppa/bean/mapper/*Mapper.xml" />
 	</bean>
 	
 	
 	
 	<bean name="transactionManager"
 		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
 		<property name="dataSource" ref="multipleDataSource"></property>
 	</bean>
 
 	
 	<tx:annotation-driven transaction-manager="transactionManager"
 		proxy-target-class="true" />
 
 	
 	<tx:advice id="transactionAdvice" transaction-manager="transactionManager">
 		<tx:attributes>
 			<tx:method name="delete*" propagation="REQUIRED" read-only="false" />
 			<tx:method name="add*" propagation="REQUIRED" read-only="false" />
 			<tx:method name="update*" propagation="REQUIRED" read-only="false" />
 			<tx:method name="save*" propagation="REQUIRED" read-only="false" />
 		</tx:attributes>
 	</tx:advice>
 
 	<aop:config>
 		<aop:pointcut id="servicePointCut"
 			expression="execution(* com.shangyon.ppa.service.impl*.*(..))" />
 		<aop:advisor pointcut-ref="servicePointCut" advice-ref="transactionAdvice"
 			order="1" />
 	</aop:config>
 
 	<bean id="sqlSessionTemplate" class="org.mybatis.spring.SqlSessionTemplate">
 		<constructor-arg index="0" ref="sqlSessionFactory" />
 	</bean>
 
 
 	<bean id="baseDao" abstract="true">
 		<property name="sqlSessionTemplate" ref="sqlSessionTemplate" />
 	</bean>
 
 	<bean id="userDao" class="com.shangyon.ppa.dao.impl.UserDaoImpl"
 		parent="baseDao">
 	</bean>
 
 	<bean id="userService" class="com.shangyon.ppa.service.impl.UserServiceImpl">
 		<property name="userDao" ref="userDao"></property>
 	</bean>
 </beans>

MultipleDataSource核心类

package com.shangyon.ppa.data;
 
 import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
 
 public class MultipleDataSource extends AbstractRoutingDataSource {
 private static final ThreadLocal<String> dataSourceKey = new InheritableThreadLocal<String>();
 
 public static void setDataSourceKey(String dataSource) {
 dataSourceKey.set(dataSource);
 }
 
 @Override
 protected Object determineCurrentLookupKey() {
 return dataSourceKey.get();
 }
 }

service测试切换数据源：

@Transactional(propagation=Propagation.REQUIRED)
    	public void testTransManage() {
    		User user = new User();
    		user.setName("111test");
    		user.setAge(221);
    		// 设置mysql数据源
    	    MultipleDataSource.setDataSourceKey("mySqlDataSource");
    	    userDao.addToMysql(user);
    	    int a = 1/0;//测试事务
    		// 设置sqlserver数据源
    		MultipleDataSource.setDataSourceKey("sqlServerDataSource");
    		userDao.addToSqlserver(user);
    	}

jdbc.properties:

jdbc.sqlserver.url=jdbc:sqlserver://192.168.1.200:1433;DatabaseName=testdb  
jdbc.sqlserver.username=sa  
jdbc.sqlserver.password=sa  
jdbc.sqlserver.driverclass=com.microsoft.sqlserver.jdbc.SQLServerDriver  
  
  
  
  
jdbc.mysql.url=jdbc:mysql://localhost:3306/ppatest  
jdbc.mysql.username=root  
jdbc.mysql.password=root  
jdbc.mysql.driverclass=com.mysql.jdbc.Driver

\------------------------------------------------------------------------------

说了这么多，大神不屑看，和我一样的小白们又因为jar包和修改配置等折腾不好，直接上源码了，数据库什么的都要自己创，一些配置也要修改：

http://pan.baidu.com/s/1x0fZg