[Freeswitch-dev] switch_odbc.c connect "max_tries" variable

Vitalii Colosov vetali100 at gmail.com
Thu May 20 03:29:48 PDT 2010

Hi dear dev team,

Is there a way to check if ODBC connection is alive and database is
accessible from my module?

For example when I am executing the following in my code and database is
sql, my_func_callback, &pdata, NULL) != SWITCH_ODBC_SUCCESS

it tries to reconnect 120 times to the database, before it gives up.

I have 2 options:
1. Check if the database is alive before executing this code (preferred)
2. Reduce max_tries to , say 3 from 120 (not preferred as it requires change
in switch_odbc.c).

Could you please hint?

Thank you,

2010/4/25 Vitalii Colosov <vetali100 at gmail.com>

> Hi,
> I am using core ODBC for MySQL connect.
> Trying to implement failover using 2 servers - main and backup.
> If main server is not responding, it should try to query backup server.
> The following is used in my module:
> if (switch_odbc_handle_callback_exec(*globals.master_odbc*, sql,
> my_func_callback, &pdata, NULL) != SWITCH_ODBC_SUCCESS) {
>  switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "(***)Error
> running query on master database: [%s]\n", sql);
> switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_INFO, "(***)Trying backup
> database: [%s]\n", globals.backup_odbc);
> if (switch_odbc_handle_callback_exec(*globals.backup_odbc*,
> sql, my_func_callback, &pdata, NULL) != SWITCH_ODBC_SUCCESS) {
>  switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "(***)Error
> running query on master and backup database: [%s]\n", sql);
>  }
>  }
> ...
> Right now it tries to reconnect to main server 120 times before it gives up
> and goes to backup server.
> I found the following in the switch_odbc.c:
> int max_tries = 120;
> Is there is a way to disable this check, so if it will not be able to
> connect to master, it will immediate go to backup server?
> I know I can change the source, but this will be already "customized core"
> - don't want to go in this direction.
> Or maybe there is a better way to handle database fail over in my module?
> Thank you,
> Vitalie
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