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Spring配置多個(gè)數(shù)據(jù)源并實(shí)現(xiàn)動(dòng)態(tài)切換示例

更新時(shí)間：2017年04月06日 09:47:52 作者：gaofuqi

本篇文章主要介紹了Spring配置多個(gè)數(shù)據(jù)源并實(shí)現(xiàn)動(dòng)態(tài)切換示例，小編覺得挺不錯(cuò)的，現(xiàn)在分享給大家，也給大家做個(gè)參考。一起跟隨小編過來看看吧

1.配置兩個(gè)不同的數(shù)據(jù)源，如下（由于項(xiàng)目使用的是druid數(shù)據(jù)庫連接，配置可以會(huì)復(fù)雜點(diǎn)比較）：

<!-- 數(shù)據(jù)源配置1 --> 
  <bean id="testDataSource1" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">  
   <property name="driverClassName" value="${db.driver}" /> 
    <property name="url" value="${unity.db.jdbc.url}" />  
   <property name="username" value="${db.login.name}"></property> 
   <property name="password" value="${db.login.password}" /> 
   <property name="filters" value="${db.filters}"></property> 
   <property name="maxActive" value="${db.pool.maxActive}"></property> 
   <property name="initialSize" value="${db.pool.initialSize}"></property> 
   <property name="minIdle" value="${db.pool.minIdle}"></property> 
   <property name="maxWait" value="${db.maxWait}"></property>   
   <property name="timeBetweenEvictionRunsMillis" value="${db.timeBetweenEvictionRunsMillis}"></property> 
   <property name="minEvictableIdleTimeMillis" value="${db.minEvictableIdleTimeMillis}"></property> 
   <property name="validationQuery" value="${db.validationQuery}"></property> 
   <property name="testWhileIdle" value="${db.testWhileIdle}"></property> 
   <property name="testOnBorrow" value="${db.testOnBorrow}"></property> 
   <property name="testOnReturn" value="${db.testOnReturn}"></property> 
   <property name="poolPreparedStatements" value="${db.poolPreparedStatements}"></property> 
   <property name="maxOpenPreparedStatements" value="${db.maxOpenPreparedStatements}"></property> 
   <!-- 監(jiān)控?cái)?shù)據(jù)庫 --> 
    <property name="proxyFilters"> 
      <list> 
        <ref bean="log-filter" /> 
      </list>  
    </property> 
    
 </bean>

<!-- 數(shù)據(jù)源配置2 --> 
 <bean id="testDataSource2" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">  
  <property name="driverClassName" value="${db.driver}" /> 
   <property name="url" value="${pub.db.jdbc.url}" />  
  <property name="username" value="${db.login.name}"></property> 
  <property name="password" value="${db.login.password}" /> 
  <property name="filters" value="${db.filters}"></property> 
  <property name="maxActive" value="${db.pool.maxActive}"></property> 
  <property name="initialSize" value="${db.pool.initialSize}"></property> 
  <property name="minIdle" value="${db.pool.minIdle}"></property> 
  <property name="maxWait" value="${db.maxWait}"></property>   
  <property name="timeBetweenEvictionRunsMillis" value="${db.timeBetweenEvictionRunsMillis}"></property> 
  <property name="minEvictableIdleTimeMillis" value="${db.minEvictableIdleTimeMillis}"></property> 
  <property name="validationQuery" value="${db.validationQuery}"></property> 
  <property name="testWhileIdle" value="${db.testWhileIdle}"></property> 
  <property name="testOnBorrow" value="${db.testOnBorrow}"></property> 
  <property name="testOnReturn" value="${db.testOnReturn}"></property> 
  <property name="poolPreparedStatements" value="${db.poolPreparedStatements}"></property> 
  <property name="maxOpenPreparedStatements" value="${db.maxOpenPreparedStatements}"></property> 
  <!-- 監(jiān)控?cái)?shù)據(jù)庫 --> 
   <property name="proxyFilters"> 
     <list> 
       <ref bean="log-filter" /> 
     </list>  
   </property> 
   
</bean>

2.定義一個(gè)類繼承AbstractRoutingDataSource實(shí)現(xiàn)determineCurrentLookupKey方法，該方法可以實(shí)現(xiàn)數(shù)據(jù)庫的動(dòng)態(tài)切換，如下：

public class DynamicDataSource extends AbstractRoutingDataSource { 
  @Override 
  protected Object determineCurrentLookupKey() { 
    return DataSourceContextHolder.getDataSourceType(); 
  } 
}

3.定義一個(gè)可以設(shè)置當(dāng)前線程的變量的工具類，用于設(shè)置對(duì)應(yīng)的數(shù)據(jù)源名稱：

public class DataSourceContextHolder { 
  private static final ThreadLocal<String> contextHolder = new ThreadLocal<String>(); 
  /** 
   * @Description: 設(shè)置數(shù)據(jù)源類型 
   * @param dataSourceType 數(shù)據(jù)庫類型 
   * @return void 
   * @throws 
   */ 
  public static void setDataSourceType(String dataSourceType) { 
    contextHolder.set(dataSourceType); 
  } 
   
  /** 
   * @Description: 獲取數(shù)據(jù)源類型 
   * @param 
   * @return String 
   * @throws 
   */ 
  public static String getDataSourceType() { 
    return contextHolder.get(); 
  } 
   
  /** 
   * @Description: 清除數(shù)據(jù)源類型 
   * @param 
   * @return void 
   * @throws 
   */ 
  public static void clearDataSourceType() { 
    contextHolder.remove(); 
  } 
}

然后在spring中配置，如下：

 <!-- 編寫spring 配置文件的配置多數(shù)源映射關(guān)系 --> 
<bean class="com.sino.access.database.DynamicDataSource" id="dataSource"> 
  <property name="targetDataSources"> 
    <map key-type="java.lang.String"> 
      <entry value-ref="testDataSource1" key="<span style="font-family: Arial, Helvetica, sans-serif;">testDataSource1</span><span style="font-family: Arial, Helvetica, sans-serif;">"></entry></span> 
      <entry value-ref="testDataSource2" key="testDataSource2"></entry> 
    </map> 
  </property> 
  <property name="defaultTargetDataSource" ref="testDataSource1"> 
  </property> 
</bean> 
 </bean>

這樣配置兩個(gè)數(shù)據(jù)源對(duì)應(yīng)的key分別為testDataSource1和testDataSource2，默認(rèn)數(shù)據(jù)庫是testDataSource。

4.完成以上步驟后，如果沒有數(shù)據(jù)庫的事務(wù)管理，已經(jīng)可以實(shí)現(xiàn)數(shù)據(jù)庫的動(dòng)態(tài)切換了。但是如果涉及到數(shù)據(jù)庫的事務(wù)管理，需要在數(shù)據(jù)庫事務(wù)開啟切換數(shù)據(jù)庫，

否則數(shù)據(jù)庫的切換只能在下次數(shù)據(jù)庫操作時(shí)才生效?？梢远x一個(gè)aop處理類在數(shù)據(jù)庫事務(wù)開啟之前切換數(shù)據(jù)庫，如下：

public class DataSourceAspect implements MethodBeforeAdvice,AfterReturningAdvice  
{ 
 
  @Override 
  public void afterReturning(Object returnValue, Method method, 
      Object[] args, Object target) throws Throwable { 
    // TODO Auto-generated method stub 
    DataSourceContextHolder.clearDataSourceType(); 
  } 
 
  @Override 
  public void before(Method method, Object[] args, Object target) 
      throws Throwable { 
   
    if (method.isAnnotationPresent(DataSource.class))  
    { 
      DataSource datasource = method.getAnnotation(DataSource.class); 
      DataSourceContextHolder.setDataSourceType(datasource.name()); 
    } 
    else 
    { 
      DataSourceContextHolder.setDataSourceType(SinoConstant.DataSourceType.unityDataSource.toString()); 
    } 
     
  } 
}

5.設(shè)置數(shù)據(jù)庫事務(wù)切面和切換數(shù)據(jù)庫切面執(zhí)行的順序，如下：

<aop:config> 
  <aop:pointcut id="transactionPointCut" expression="execution(* com.test.service.*.*(..))" /> 
  <aop:advisor pointcut-ref="transactionPointCut" 
    advice-ref="txAdvice" order="2" /> 
  <aop:advisor advice-ref="dataSourceExchange" pointcut-ref="transactionPointCut" order="1"/> 
</aop:config>

利用aop的order屬性設(shè)置執(zhí)行的順序，這樣實(shí)現(xiàn)了帶事務(wù)管理的spring數(shù)據(jù)庫動(dòng)態(tài)切換。

以上就是本文的全部內(nèi)容，希望對(duì)大家的學(xué)習(xí)有所幫助，也希望大家多多支持腳本之家。

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