On 07/01/2010 03:12 AM, Markus Hoenicka wrote:
> Vikram Ambrose <[email protected]> was heard to say:
>
>> Is there a way of having the mysql driver, reconnect and then complete
>> the query without erroring out, in the case of driver/server timeout?
>> This way I do not lose my query to a timeout or need to have some sort
>> of global command buffer that the callback would use to re-execute the
>> failed query.
>
> Hi,
>
> does the MySQL API provide enough information to tell from a failure
> of mysql_query that the connection has stalled? I've found a log entry
> in cvs which added a timeout option to the driver, so with that in
> place and a useful error message from libmysqlclient I'd say it's
> doable. We'd just have to loop over a limited number of retries,
> trying to reconnect each time before resending the query.
>
There is indeed enough information to find this scenario. Here is a very
simple callback I use at the moment:
void DB_error_callback(dbi_conn conn, void *udata){
int rv;
const char *errormsg = NULL;
rv = dbi_conn_error(DB_conn,&errormsg);
if(strstr(errormsg,"gone away")){
rv = dbi_conn_connect(DB_conn);
if(rv){
printf("ERROR: DB_error_callback: Tried to reconnect -
failed\n");
}else {
printf("ERROR: DB_error_callback: Reconnected\n");
}
}
}
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