接上一個博文（http://www.loveweir.com/html/18.html），沒有數據庫連接池，純粹用jpa的官方鏈接。

所以這次要加上連接池本文用Druid連接池來實現多數據源的配置。

persistence.xml 這個文件可以省略了，全部配置在applicationContext.xml 里面：

<?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:jpa="http://www.springframework.org/schema/data/jpa"    xmlns:mvc="http://www.springframework.org/schema/mvc"    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.xsd        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.1.xsd        http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd        http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.1.xsd        http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.1.xsd        http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa-1.2.xsd">        <context:annotation-config/>    <context:component-scan base-package="com.tw"/>        <!-- MySQL數據源配置 -->    <bean id="mysqlDataSource" class="com.alibaba.druid.pool.DruidDataSource"        init-method="init" destroy-method="close">        <!-- 驅動名稱 -->        <property name="DriverClassName" value="com.mysql.jdbc.Driver" />        <!-- JDBC連接串 -->        <property name="url"            value="jdbc:mysql://192.168.132.1:3306/twq?useUnicode=true&amp;characterEncoding=UTF-8" />        <!-- 數據庫用戶名稱 -->        <property name="username" value="ws" />        <!-- 數據庫密碼 -->        <property name="passWord" value="unionmanws" />        <!-- 連接池最大使用連接數量 -->        <property name="maxActive" value="20" />        <!-- 初始化大小 -->        <property name="initialSize" value="5" />        <!-- 獲取連接最大等待時間 -->        <property name="maxWait" value="60000" />        <!-- 連接池最小空閑 -->        <property name="minIdle" value="2" />        <!-- 逐出連接的檢測時間間隔 -->        <property name="timeBetweenEvictionRunsMillis" value="3000" />        <!-- 最小逐出時間 -->        <property name="minEvictableIdleTimeMillis" value="300000" />        <!-- 測試有效用的SQL Query -->        <property name="validationQuery" value="SELECT 'x'" />        <!-- 連接空閑時測試是否有效 -->        <property name="testWhileIdle" value="true" />        <!-- 獲取連接時測試是否有效 -->        <property name="testOnBorrow" value="false" />        <!-- 歸還連接時是否測試有效 -->        <property name="testOnReturn" value="false" />    </bean>          <!-- 整合mysqljpa -->      <bean id="mysqlEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">          <property name="dataSource" ref="mysqlDataSource"></property>          <property name="packagesToScan" value="com.tw.entity.sys"></property>          <property name="persistenceUnitName" value="mysqldb"></property>          <property name="jpaVendorAdapter">              <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">                  <property name="showSql" value="true"></property>              </bean>          </property>          <property name="jpaProperties">            <props>                <!--設置外連接抓取樹的最大深度 -->                <prop key="hibernate.max_fetch_depth">3</prop>                <prop key="hibernate.jdbc.fetch_size">18</prop>                <prop key="hibernate.jdbc.batch_size">10</prop>                <!-- 自動建表類型 validate|create|create-drop|update -->                <!-- <prop key="hibernate.hbm2ddl.auto">validate</prop> -->                <!-- 是否顯示SQL -->                <prop key="hibernate.show_sql">false</prop>                <!-- 顯示SQL是否格式化 -->                <prop key="hibernate.format_sql">false</prop>                <!-- 關閉二級緩存 -->                <prop key="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</prop>                <!-- 關閉實體字段映射校驗 -->                <prop key="javax.persistence.validation.mode">none</prop>            </props>        </property>      </bean>      <bean id="mysqltransactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">        <property name="entityManagerFactory" ref="mysqlEntityManagerFactory" />        <qualifier value="mysqlEM"/>      </bean>    <tx:annotation-driven transaction-manager="mysqltransactionManager" proxy-target-class="false"/>                      <!-- sqlserver數據源配置 -->    <bean id="sqlserverDataSource" class="com.alibaba.druid.pool.DruidDataSource"        init-method="init" destroy-method="close">        <!-- 驅動名稱 -->        <property name="DriverClassName" value="com.microsoft.sqlserver.jdbc.SQLServerDriver" />        <!-- JDBC連接串 -->        <property name="url"            value="jdbc:sqlserver://192.168.130.10:1433;DatabaseName=unionman" />        <!-- 數據庫用戶名稱 -->        <property name="username" value="sa" />        <!-- 數據庫密碼 -->        <property name="password" value="123abc" />        <!-- 連接池最大使用連接數量 -->        <property name="maxActive" value="20" />        <!-- 初始化大小 -->        <property name="initialSize" value="5" />        <!-- 獲取連接最大等待時間 -->        <property name="maxWait" value="60000" />        <!-- 連接池最小空閑 -->        <property name="minIdle" value="2" />        <!-- 逐出連接的檢測時間間隔 -->        <property name="timeBetweenEvictionRunsMillis" value="3000" />        <!-- 最小逐出時間 -->        <property name="minEvictableIdleTimeMillis" value="300000" />        <!-- 測試有效用的SQL Query -->        <property name="validationQuery" value="SELECT 'x'" />        <!-- 連接空閑時測試是否有效 -->        <property name="testWhileIdle" value="true" />        <!-- 獲取連接時測試是否有效 -->        <property name="testOnBorrow" value="false" />        <!-- 歸還連接時是否測試有效 -->        <property name="testOnReturn" value="false" />    </bean>            <!-- 整合sqlserverjpa -->      <bean id="sqlserverEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">          <property name="dataSource" ref="sqlserverDataSource"></property>          <property name="packagesToScan" value="com.tw.entity.plan"></property>          <property name="persistenceUnitName" value="sqlserverdb"></property>          <property name="jpaVendorAdapter">              <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">                  <property name="showSql" value="true"></property>              </bean>          </property>          <property name="jpaProperties">            <props>                <!--設置外連接抓取樹的最大深度 -->                <prop key="hibernate.max_fetch_depth">3</prop>                <prop key="hibernate.jdbc.fetch_size">18</prop>                <prop key="hibernate.jdbc.batch_size">10</prop>                <!-- 自動建表類型 validate|create|create-drop|update -->                <!-- <prop key="hibernate.hbm2ddl.auto">validate</prop> -->                <!-- 是否顯示SQL -->                <prop key="hibernate.show_sql">false</prop>                <!-- 顯示SQL是否格式化 -->                <prop key="hibernate.format_sql">false</prop>                <!-- 關閉二級緩存 -->                <prop key="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</prop>                <!-- 關閉實體字段映射校驗 -->                <prop key="javax.persistence.validation.mode">none</prop>            </props>        </property>      </bean>      <bean id="sqlservertransactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">        <property name="entityManagerFactory" ref="sqlserverEntityManagerFactory" />        <qualifier value="sqlserverEM"/>      </bean>    <tx:annotation-driven transaction-manager="sqlservertransactionManager" proxy-target-class="false"/>    </beans>

其他不需要變動，這樣就ok。