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spring基于通用Dao的多數(shù)據(jù)源配置詳解

更新時(shí)間：2018年03月25日 11:37:36 作者：Crazy光光

這篇文章主要為大家詳細(xì)介紹了spring基于通用Dao的多數(shù)據(jù)源配置，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下解

有時(shí)候在一個(gè)項(xiàng)目中會(huì)連接多個(gè)數(shù)據(jù)庫(kù),需要在spring中配置多個(gè)數(shù)據(jù)源,最近就遇到了這個(gè)問(wèn)題,由于我的項(xiàng)目之前是基于通用Dao的，配置的時(shí)候問(wèn)題不斷，這種方式和資源文件沖突；掃描映射文件的話(huà)，SqlSessionFactory的bean名字必須是sqlSessionFactory 他讀不到sqlSessioNFactory2或者其他名字,最終解決方法如下：

1.在項(xiàng)目中加入如下類(lèi)MultipleDataSource.java

package com.etoak.util; 
 
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() { 
    // TODO Auto-generated method stub 
    return dataSourceKey.get(); 
  } 
 
}

spring配置文件如下：

<beans xmlns="http://www.springframework.org/schema/beans" 
  xmlns:context="http://www.springframework.org/schema/context" 
  xmlns:p="http://www.springframework.org/schema/p" 
  xmlns:mvc="http://www.springframework.org/schema/mvc" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xsi:schemaLocation="http://www.springframework.org/schema/beans  
    http://www.springframework.org/schema/beans/spring-beans-3.2.xsd 
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.2.xsd 
    http://www.springframework.org/schema/mvc 
    http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"> 
 
  <context:component-scan base-package="com"/> 
   
  <mvc:annotation-driven/> 
   
 
  <context:property-placeholder location="classpath:db.properties"/> 
  <bean id="ds1" class="org.springframework.jdbc.datasource.DriverManagerDataSource" 
    p:driverClassName="${mysql.driver}" 
    p:url="${mysql.url}" 
    p:username="${mysql.username}" 
    p:password="${mysql.password}"/> 
  <bean id="ds2" class="org.springframework.jdbc.datasource.DriverManagerDataSource" 
    p:driverClassName="${mysql2.driver}" 
    p:url="${mysql2.url}" 
    p:username="${mysql2.username}" 
    p:password="${mysql2.password}"/> 
   
   
  <bean id="multipleDataSource" class="com.etoak.util.MultipleDataSource"> 
    <property name="defaultTargetDataSource" ref="ds1"/> 
    <property name="targetDataSources"> 
      <map> 
        <entry key="ds1" value-ref="ds1"/> 
        <entry key="ds2" value-ref="ds2"/> 
      </map> 
    </property> 
  </bean> 
   
  <bean id="sqlSessionFactory1" class="org.mybatis.spring.SqlSessionFactoryBean" 
    p:dataSource-ref="multipleDataSource" 
    p:mapperLocations="classpath:com/etoak/dao/*-mapper.xml"/> 
   
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> 
    <property name="basePackage" value="com.etoak.dao"/> 
        <property name="markerInterface" value="com.etoak.dao.BaseDao" /> 
  </bean>   
   
</beans>

測(cè)試類(lèi)如下：

package com.etoak.test; 
 
import org.springframework.context.ApplicationContext; 
import org.springframework.context.support.FileSystemXmlApplicationContext; 
 
import com.etoak.dao.ProductDaoIf; 
import com.etoak.util.MultipleDataSource; 
 
public class Test { 
 
  public static void main(String[] args) { 
    ApplicationContext ac = new  
      FileSystemXmlApplicationContext("WebContent/WEB-INF/etoak-servlet.xml"); 
     
    ProductDaoIf proDao = (ProductDaoIf)ac.getBean(ProductDaoIf.class); 
     
    MultipleDataSource.setDataSourceKey("ds1"); 
    int count1 = proDao.selectProductCount(); 
    MultipleDataSource.setDataSourceKey("ds2"); 
    int count2 = proDao.selectProductCount(); 
    System.out.println(count1); 
    System.out.println(count2); 
  } 
 
}

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