问

mysql - 如何显式修改数据库连接超时时间

cz小屁孩865 发布于 2022-11-02 02:14

spring

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

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    |
+-----------------------------+----------+

1 个回答

 /**
     * <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 createDataSource
        throw 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。

2022-11-03 14:13 回答

政儒思贤丽正

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