SprintMVC+mybatis 多数据源

SprintMVC+mybatis 多数据源配置

1. 网上看了不少文章，都有这方面相关的文章，写这边博客，也主要是给自己留一份记录

2. 今天这个方法虽然实现了多数据源的切换，不过未采用分布式事务管理，导致单个业务内多数据源无法回滚，这个后面有时间再加上。（这个链接写的方法应该能用 https://blog.csdn.net/qq_37061442/article/details/82350258）

一定要注意的地方：在没配分布式事务的情况下调用多数据源的方法记得要去掉事务，不去掉事务切换数据源会失败

（https://blog.csdn.net/wangjun5159/article/details/51980489）

下面代码奉上：

首先是数据源配置 spring-mybatis.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:context="http://www.springframework.org/schema/context"
	xmlns:jee="http://www.springframework.org/schema/jee" xmlns:lang="http://www.springframework.org/schema/lang"
	xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util"
	xmlns:websocket="http://www.springframework.org/schema/websocket"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd
		http://www.springframework.org/schema/jee http://www.springframework.org/schema/jee/spring-jee.xsd
		http://www.springframework.org/schema/lang http://www.springframework.org/schema/lang/spring-lang.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd
	    http://www.springframework.org/schema/websocket http://www.springframework.org/schema/websocket/spring-websocket.xsd">

	<context:annotation-config />

	<!-- 数据转换和数据格式化功能日期 -->
	<mvc:annotation-driven />

	<context:component-scan base-package="com.cjkj" />
		
	
	<!-- 数据源配置 -->
	 <bean id="dataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
		<property name="jndiName" value="java:comp/env/jdbc/h5mEduDB"></property>
	</bean>
	
	<!-- 外网数据源配置 -->
	<bean id="nwDataSource" class="org.springframework.jndi.JndiObjectFactoryBean">
		<property name="jndiName" value="java:comp/env/jdbc/wwH5mEdu"></property>
	</bean>
	
		
		
	<!--统一的dataSource-->
	<bean id="dynamicDataSource" class="com.cjkj.h5m.dataSource.DynamicDataSource" >
	    <property name="targetDataSources">
	        <map key-type="java.lang.String">
	             <!--通过不同的key决定用哪个dataSource-->
	             <entry value-ref="dataSource" key="dataSource"></entry>
	             <entry value-ref="nwDataSource" key="nwDataSource"></entry>
	            
	        </map>
	    </property>
	    <!--设置默认的dataSource-->
	    <property name="defaultTargetDataSource" ref="dataSource">
	    </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="dynamicDataSource" />
		<!-- 自动扫描mapping.xml文件 -->
		<property name="mapperLocations" value="classpath:/mybatis/*Mapper.xml"></property>
	</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.cjkj.h5m.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="dynamicDataSource" />
	</bean>
	
	<!-- 使用annotation定义事务 -->
	<tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true" />


	<!-- 将常用的属性值放入属性文件中 -->
	<bean id="configProperties"
		class="org.springframework.beans.factory.config.PropertiesFactoryBean">
		<property name="locations">
			<list>
				<value>classpath:/conf/*.properties</value>
			</list>
		</property>
	</bean>

	<bean id="propertyConfigurer"
		class="org.springframework.beans.factory.config.PreferencesPlaceholderConfigurer">
		<property name="properties" ref="configProperties" />
	</bean>

</beans>

第二增加两个文件

CustomerContextHolder

public class CustomerContextHolder {
    public static final String DATA_SOURCE_DEV = "dataSource";
    public static final String DATA_SOURCE_NW = "nwDataSource";
    //用ThreadLocal来设置当前线程使用哪个dataSource
    private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>();
    public static void setCustomerType(String customerType) {
        contextHolder.set(customerType);
    }
    public static String getCustomerType() {
        String dataSource = contextHolder.get();
        if (StringUtils.isEmpty(dataSource)) {
            return DATA_SOURCE_DEV;
        }else {
            return dataSource;
        }
    }
    public static void clearCustomerType() {
        contextHolder.remove();
    }
}

DynamicDataSource （此处DynamicDataSource 和 spring-mybatis.xml 中 <bean id="dynamicDataSource" class="com.cjkj.h5m.dataSource.DynamicDataSource" > 路径相对应）


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

public class DynamicDataSource 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();
	    }
	}

第三如何切换数据源

在业务模块代码中使用下面代码进行切换

DynamicDataSource.setDataSourceKey(CustomerContextHolder.DATA_SOURCE_DEV);//切换本地数据源

user.save(); //访问本地数据源

DynamicDataSource.setDataSourceKey(CustomerContextHolder.DATA_SOURCE_NW); //切换NW数据源

user.save();//访问nw 数据源

SprintMVC+mybatis 多数据源

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