myBatis連接MySQL報異常：No operations allowed after connection closed.Connection was implicitly closed

### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.

網上查了下，由於使用了默認配置，空閒超過8小時，自動斷開該連接

我使用的是mybatis的默認連接池，於是把該配的，都配置上。datasource的屬性，可參考mybatis官方文檔

        <environment id="env_stg">
            <transactionManager type="JDBC" />
            <dataSource type="POOLED">
                <property name="driver" value="${driver}" />
                <property name="url" value="${url_stg}" />
                <property name="username" value="${username}" />
                <property name="password" value="${password}" />
                <property name="poolMaximumActiveConnections" value="20"/>
                <property name="poolMaximumIdleConnections" value="5"/>
                <!-- MySQLNonTransientConnectionException: No operations allowed after connection closed -->
                <property name="poolPingQuery" value="select 1"/>
                <property name="poolPingEnabled" value="true"/>
                <!-- 對於空閒的連接一個小時檢查一次 -->
                <property name="poolPingConnectionsNotUsedFor" value="3600000"/>
            </dataSource>
        </environment>

參考：http://fengbin2005.iteye.com/blog/1906488