5-4代碼層讀寫分離的實現B

mybatis-config.xml

• 添加plugin

    <plugins>
            <plugin interceptor="com.o2o.dao.split.DynamicDataSourceInterceptor">
        </plugin>
    </plugins>

• 添加日誌-DynamicDataSourceInterceptor

  logger.debug("設置方法[{}] use[{}] Strategy,SqlCommandType [{}]..", ms.getId(), lookupKey,ms.getSqlCommandType().name());
  DynamicDataSourceHolder.setDbType(lookupKey);
        return invocations.proceed();

• spring-dao:修改dataSource

        <!--abstract:就相當於聲明爲父數據源,子數據源能繼承父數據源的屬性-->
        <bean id="abstractDataSource" abstract="true"
        class="com.mchange.v2.c3p0.ComboPooledDataSource"
        destroy-method="close">
        <!-- 配置連接池屬性 -->

        <!-- c3p0連接池的私有屬性 -->
        <property name="maxPoolSize" value="30" />
        <property name="minPoolSize" value="10" />
        <!-- 關閉連接後不自動commit -->
        <property name="autoCommitOnClose" value="false" />
        <!-- 獲取連接超時時間 -->
        <property name="checkoutTimeout" value="10000" />
        <!-- 當獲取連接失敗重試次數 -->
        <property name="acquireRetryAttempts" value="2" />
    </bean>
    <!--parent:聲明父數據源是誰-->
    <bean id="master" parent="abstractDataSource">
        <property name="driverClass" value="${jdbc.driver}" />
        <!--這裏修改爲master.url,當然數據庫連接文件也會添加相應信息 -->
        <property name="jdbcUrl" value="${jdbc.master.url}" />
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>
    <bean id="slave" parent="abstractDataSource">
        <property name="driverClass" value="${jdbc.driver}" />
        <property name="jdbcUrl" value="${jdbc.slave.url}" />
        <property name="user" value="${jdbc.username}" />
        <property name="password" value="${jdbc.password}" />
    </bean>
    <!-- 配置動態數據源,這兒的targetDataSources就是路由數據源所對應的名稱,將這兩個數據源信息傳入編寫的類裏,(其實是傳入編寫的類的父類) -->
    <!--value-ref和數據源bean-id保持一致,key和編寫類的lookupkey保持一致 -->
    <bean id="dynamicDataSource"
        class="com.o2o.dao.split.DynamicDataSource">
        <property name="targetDataSources">
            <map>
                <entry value-ref="master" key="master"></entry>
                <entry value-ref="slave" key="slave"></entry>
            </map>
        </property>
    </bean>
    <!-- 配置懶加載  -->
    <bean id="dataSource"
        class="org.springframework.jdbc.datasource.LazyConnectionDataSourceProxy">
        <property name="targetDataSource">
            <ref bean="dynamicDataSource" />
        </property>
    </bean>