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From Shreyas Kaushik <Shreyas.Kaus...@Sun.COM>
Subject Re: [jira] Updated: (DERBY-31) Statement.setQueryTimeout() support.
Date Fri, 25 Feb 2005 10:43:01 GMT
I have implemented this for a SQL Query timeout. I thought this is not 
applicable to insert and update timeouts ( I donno
if there is something like that and how do we set that ). This is for 
*queries only* .

What my patch addresses is the closing of the activation for that 
statement when there is a timeout. It is the activation that
holds the key to all the stuff below it( includes the ResultSets) so by 
closing the activation all the tree of ResultSet and
other resources should get released. I did a memory profiling after 
doing this patch and it did not detect any memory leaks.

thanks
Shreyas

Ali Demir wrote:

> Thank you!
>
> How does the internals work? Does the cancelled query release all the 
> locks it might have been holding? Does it only work for this kind of 
> select? What if it were waiting for another insert/update transaction? 
> Would it still be able to cancel the select and return?
>
> Regards,
> Ali
>
>
> At 09:28 PM 2/23/2005, you wrote:
>
>>      [ http://issues.apache.org/jira/browse/DERBY-31?page=history ]
>>
>> Shreyas Kaushik updated DERBY-31:
>> ---------------------------------
>>
>>     Attachment: Derby-31.patch
>>
>> This is the patch for implementing setQueryTimeout() in  
>> EmbedStatement.java . I clsoe the activation for the statement when 
>> the query times out so that the query stops executing. I tested this 
>> by inserting data into a table continuosly for about 12 hours and 
>> then doing a select * on it by setting the time out to 1 sec. It 
>> worked fine by cancelling the statement execution when the timeout 
>> happened.
>>
>> > Statement.setQueryTimeout() support.
>> > ------------------------------------
>> >
>> >          Key: DERBY-31
>> >          URL: http://issues.apache.org/jira/browse/DERBY-31
>> >      Project: Derby
>> >         Type: New Feature
>> >   Components: JDBC
>> >  Environment: ALL
>> >     Reporter: Ali Demir
>> >  Attachments: Derby-31.patch, QueryTimer.java
>> >
>> > Calling Statement.setQueryTimeout() throws exception saying that 
>> function is not supported. This is an important JDBC feature and is 
>> limiting our options to use Derby with our JDBC code. Implementing 
>> this JDBC function would make Derby much easier to adopt.
>>
>> -- 
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>
>
>

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