spring基于通用Dao的多数据源配置详解

时间:2022-09-02 21:16:07

有时候在一个项目中会连接多个数据库,需要在spring中配置多个数据源,最近就遇到了这个问题,由于我的项目之前是基于通用Dao的,配置的时候问题不断,这种方式和资源文件冲突;扫描映射文件的话,SqlSessionFactory的bean名字必须是sqlSessionFactory 他读不到sqlSessioNFactory2或者其他名字,最终解决方法如下:

1.在项目中加入如下类MultipleDataSource.java

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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:

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<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>

测试类如下:

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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);
  }
 
}

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:https://blog.csdn.net/u012116457/article/details/50518430