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我正在使用 Spring JDBCTemplate 在 apache commons 数据源（org.apache.commons.dbcp.BasicDataSource）上执行 SQL 操作，当服务启动并运行很长时间时，我最终得到了这个异常：

org.springframework.dao.RecoverableDataAccessException: StatementCallback; SQL [SELECT * FROM vendor ORDER BY name]; The last packet successfully received from the server was 64,206,061 milliseconds ago.  The last packet sent successfully to the server was 64,206,062 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.; nested exception is com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: The last packet successfully received from the server was 64,206,061 milliseconds ago.  The last packet sent successfully to the server was 64,206,062 milliseconds ago. is longer than the server configured value of 'wait_timeout'. You should consider either expiring and/or testing connection validity before use in your application, increasing the server configured values for client timeouts, or using the Connector/J connection property 'autoReconnect=true' to avoid this problem.
    at org.springframework.jdbc.support.SQLExceptionSubclassTranslator.doTranslate(SQLExceptionSubclassTranslator.java:98)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
    at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:80)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:406)
    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:455)
    at org.springframework.jdbc.core.JdbcTemplate.query(JdbcTemplate.java:463)
    at com.cable.comcast.neto.nse.taac.dao.VendorDao.getAllVendor(VendorDao.java:25)
    at com.cable.comcast.neto.nse.taac.controller.RemoteVendorAccessController.requestAccess(RemoteVendorAccessController.java:78)

我尝试将'autoReconnect = true'添加到连接字符串，但仍然出现此问题。是否可以使用另一个数据源来为我管理重新连接？

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2 回答 2

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BasicDataSource 可以为您管理保持连接活动。您需要设置以下属性：

minEvictableIdleTimeMillis = 120000 // Two minutes
testOnBorrow = true
timeBetweenEvictionRunsMillis = 120000 // Two minutes
minIdle = (some acceptable number of idle connections for your server)

这些将配置数据源以不断测试您的连接，并在它们变得陈旧时过期并删除它们。您可能还需要考虑检查基本数据源上的许多其他属性，以调整连接池性能。过去我遇到了一些奇怪的问题，我在访问数据库时遇到问题，这一切都归结为连接池的配置方式。

于 2010-11-19T00:25:48.923 回答
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您可以尝试 C3PO：

http://sourceforge.net/projects/c3p0/

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"destroy-method="close">
   <property name="user" value="${db.username}"/>
   <property name="password" value="${db.password}"/>
   <property name="driverClass" value="${db.driverClassName}"/>
   <property name="jdbcUrl" value="${db.url}"/>
   <property name="initialPoolSize" value="0"/>
   <property name="maxPoolSize" value="1"/>
   <property name="minPoolSize" value="1"/>
   <property name="acquireIncrement" value="1"/>
   <property name="acquireRetryAttempts" value="0"/>
   <property name="idleConnectionTestPeriod" value="600"/> <!--in seconds-->
</bean>

问候 pacovr

于 2010-09-21T14:13:11.527 回答