Question

我正在尝试使用c3p0连接池上传图像（逐个）但我的jdbc类型4驱动程序（连接到mysql）一直在关闭连接。我已经看到mysql配置中的最大超时设置为300秒。这是我的持久性xml如何使用c3p0。

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
    scope="singleton" destroy-method="close">
    <property name="driverClass" value="...." />
    <property name="jdbcUrl" value="...." />
    <property name="user" value="....." />
    <property name="password" value="...." />
    <property name="initialPoolSize" value="10" />
    <property name="minPoolSize" value="5" />
    <property name="maxPoolSize" value="20" />
    <property name="maxIdleTime" value="5" />
    <property name="autoCommitOnClose" value="false" />
</bean>

有人可以解释究竟是什么导致驱动程序隐式关闭连接。另外，我该如何解决这个问题呢？

以下是我收到的错误消息：

19:01:45,504  WARN NewPooledConnection:486 - [c3p0] A PooledConnection that has already signalled a Connection error is still in use!

19:01:45,505  WARN NewPooledConnection:487 - [c3p0] Another error has occurred [ 

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.Connection was implicitly closed by the driver. ] which will not be reported to listeners!

com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: No operations allowed after connection closed.Connection was implicitly closed by the driver.

Answer 1

您可以将其更改为

<property name="maxIdleTime" value="0" />  //0 = never expire

连接关闭后不允许任何操作。驱动程序隐式关闭了连接。 C3P0

1 个答案: