数据库连接丢失，重连 Cause: java.sql.SQLException: Could not retrieve transation read-only status server

java程序运行中突然报如下错误：

### Error querying database. Cause: java.sql.SQLException: Could not retrieve transation read-only status server
### The error may exist in file [F:\duijie\ATEA\change_0606\shopweb-plugin-abm-atea_0619\classes\com\hanshows\plugin\dao\IntegrationTaskMapper.xml]

org.apache.ibatis.exceptions.PersistenceException:
### Error querying database. Cause: java.sql.SQLException: Could not retrieve transation read-only status server

Caused by: java.sql.SQLException: Could not retrieve transation read-only status server

Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet successfully received from the server was 611,444 milliseconds ago. The last packet sent successfully to the server was 23 milliseconds ago.

Caused by: java.io.EOFException: Can not read response from server. Expected to read 4 bytes, read 0 bytes before connection was unexpectedly lost.
at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:3166)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3620)
... 35 more

报错如上。网上查询很多说是mysql-connector-java-5.1.28与数据库不匹配的问题，但是我这个不是，程序正常运行没有问题，但是一旦手动重启MYSQL服务就会报这个错误。

查了下网上，在Spring配置DBCP连接池的时候，在定义datasource增加属性 validationQuery和 testOnBorrow就可以了。重新运行程序，手动重启mysql上面错误不见了。

bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"  destroy-method="close">
         <property name="driverClassName" value="${db.driver}"/>
         <property name="url" value="${db.url}"/>
         <property name="username" value="${db.user.account}"/>
         <property name="password" value="${db.user.password}"/>
         <property name="maxActive" value="5"/>
         <property name="maxIdle" value="5"/>
         <property name="maxWait" value="60000"/>
         <property name="defaultAutoCommit" value="true"/>
         <property name="logAbandoned" value="true"/>
         <property name="removeAbandoned" value="true"/>
         <property name="removeAbandonedTimeout" value="600"/>
      <property name="validationQuery" value="SELECT 1" />
      <property name="testOnBorrow" value="true"/>
     </bean>

如果是c3p0连接池则在定义datasource的时候，添加属性testConnectionOnCheckin和testConnectionOnCheckout，如：

<bean name="cacheCloudDB" class="com.mchange.v2.c3p0.ComboPooledDataSource">
    <property name="driverClass" value="${jdbc.driver}"/>
    <property name="jdbcUrl" value="${cache.url}"/>
    <property name="user" value="${cache.user}"/>
    <property name="password" value="${cache.password}"/>
    <property name="initialPoolSize" value="10"/>
    <property name="maxPoolSize" value="${cache.maxPoolSize}"/>
    <property name="testConnectionOnCheckin" value="false"/>
    <property name="testConnectionOnCheckout" value="true"/>
    <property name="preferredTestQuery" value="SELECT 1"/>
</bean>

如果使用的是JDBC，在JDBC URL上添加?autoReconnect=true，如：

jdbc:mysql://10.10.10.10:3306/mydb?autoReconnect=true

数据库连接丢失，重连 Cause: java.sql.SQLException: Could not retrieve transation read-only status server

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