mysql - 如何显式修改数据库连接超时时间

问题描述

spring + mybatis

redis.incr(key); //redis计数加一try{ dbOPerHere(); //数据库操作}catch (Exception e){ //若数据库操作失败 减一 redis.decr(key); }

想模拟网路异常 数据库连接超时异常 通过如下方式模拟数据库连接异常

sudo iptables -A INPUT -p tcp --dport 3306 -j DROP

但发现要等差不多三分钟 才会有超时异常另外一个奇怪现象 同样的数据源配置 若换成测试服务器 超时时间为6分钟 不知何故

Caused by: java.net.ConnectException: Connection timed out

如何显式设置数据库连接超时时间（如超时时间5秒）， 不管是配置数据源 还是 修改mysql服务器的变量？使用的数据源如下

<bean destroy-method='close'>

或修改mysql服务器变量

>show variables like ’%timeout%’;+-----------------------------+----------+| Variable_name | Value |+-----------------------------+----------+| connect_timeout | 10 || delayed_insert_timeout | 300 || innodb_flush_log_at_timeout | 1|| innodb_lock_wait_timeout | 50 || innodb_rollback_on_timeout | OFF || interactive_timeout | 28800 || lock_wait_timeout | 31536000 || net_read_timeout | 30 || net_write_timeout | 60 || rpl_stop_slave_timeout | 31536000 || slave_net_timeout | 3600 || wait_timeout| 28800 |+-----------------------------+----------+

问题解答

/** * <strong>BasicDataSource does NOT support this method. </strong> * * <p>Set the login timeout (in seconds) for connecting to the * database.</p> * <p> * Calls {@link #createDataSource()}, so has the side effect * of initializing the connection pool.</p> * * @param loginTimeout The new login timeout, or zero for no timeout * @throws UnsupportedOperationException If the DataSource implementation * does not support the login timeout feature. * @throws SQLException if a database access error occurs */ public void setLoginTimeout(int loginTimeout) throws SQLException {// This method isn’t supported by the PoolingDataSource returned by// the createDataSourcethrow new UnsupportedOperationException('Not supported by BasicDataSource');//createDataSource().setLoginTimeout(loginTimeout); }

* <strong>BasicDataSource does NOT support this method. </strong> *

以上是dbcp连接池的源代码，不知道这个LoginTimeout()具体是做什么的，仅供参考，并期待问题后续。