Hugi ... that's overkill! Just add autoReconnect=true to the connection URL.
:P ....... for example:
mydatabase.URL=jdbc:mysql://myhost/mydatabase?capitalizeTypenames=true&useBundledJdbcInfo=true&autoReconnect=true
On Jul 20, 2013, at 4:26 AM, Hugi Thordarson <h...@karlmenn.is> wrote:
> Below is an example of how you might do this with a Timer.
>
> You *could* copy this class to all of your apps, call init() in their
> Application class constructors and call it a day (or, as you suggest,
> subclass ERXApplication and use that subclass in your MySQL apps). But best
> practice would really be to have a principal class in your common framework
> (a class that's loaded when the framework is loaded, you can specify it in
> the "WOLips Development"-part of your Eclipse project's properties). And that
> principal class should probably make sure you're listening for
> EOModelGroup.ModelAddedNotification to see which models use MySQL and then
> use that information to create keepalive-timers for each MySQL connection.
>
> The way you go depends on the scale of your operation, I guess. But a little
> overengineering never hurt anyone. *cough cough*
>
> -----------------
>
> public class MakeMySQLSuckALittleLess {
>
> public static void init() {
> NSTimestamp firstRun = new
> NSTimestamp().timestampByAddingGregorianUnits( 0, 0, 0, 1, 0, 0 );
> new Timer().scheduleAtFixedRate( new
> KeepMySQLConnectionAliveTask(), firstRun, 3600 * 1000 );
> }
>
> private static class KeepMySQLConnectionAliveTask extends TimerTask {
>
> @Override
> public void run() {
> EOFetchSpecification fs = …; // Perform some
> lightweight operation on your MySQL connection
>
> ERXEC.newEditingContext().objectsWithFetchSpecification( fs );
> }
> }
> }
>
> -----------------
>
> - hugi
>
>
>
> On 20.7.2013, at 06:49, Pierre Gilquin <pgilq...@citycable.ch> wrote:
>
>> Yes better than restart mysqld or the server ...
>>
>> Could you please share some lines of code ?.
>> In order to do that for all mysql apps, I think to subclass ERXApplication
>> and use a independent access like "show tables"
>>
>>
>> Pierre
>>
>>
>>> That's what I do...
>>>> On Jul 19, 2013, at 4:50 PM, Hugi Thordarson <h...@karlmenn.is> wrote:
>>>>
>>>> Create a Timer that fires every hour to fetch an object?
>>>>
>>>> It's the perfect hack; simple yet disgusting.
>>>>
>>>> - hugi
>>>>
>>>>
>>>>> On 19.7.2013, at 15:01, Pierre Gilquin <pgilq...@citycable.ch> wrote:
>>>>>
>>>>> Thanks for your help
>>>>>
>>>>>
>>>>> I realize that 8 hours are the setting for wait_timeout in mysql server.
>>>>>
>>>>> As my app is not used at night, I think to change wait_timeout to 24h and
>>>>> schedule a restart of my WO app every night.
>>>>>
>>>>>
>>>>> Do you thing it could solve the problem in a easy way ?
>>>>>
>>>>>
>>>>> Pierre
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>> Hi,
>>>>>> This is a well known bug in MySQL driver. It happens after 8 hours of
>>>>>> being idle. Try not to use the driver 's default connection pool, use
>>>>>> some altetnatives such as C3po.
>>>>>> Best of luck!
>>>>>> On 19 Jul 2013 20:33, "Pierre Gilquin" <pgilq...@citycable.ch
>>>>>> <mailto:pgilq...@citycable.ch>> wrote:
>>>>>> Hi
>>>>>> If mysql is not accessed by my app for a long period of time (around
>>>>>> 8h), an exception is throwned.
>>>>>> Is there a setting that I can apply to my wonder-WO app or mysql to
>>>>>> prevent this ?
>>>>>> Thanks in advance
>>>>>> Pierre
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