[freetds] affected rows after insert

David Nichols david at qore.org
Wed Nov 11 15:00:17 EST 2015


> On Nov 11, 2015, at 8:54 PM, Frediano Ziglio <freddy77 at gmail.com> wrote:
> 
> 2015-11-03 11:56 GMT+00:00 David Nichols <david at qore.org>:
>> On Oct 20, 2015, at 11:17 AM, David Nichols <david at qore.org> wrote:
>>> 
>>>> 
>>>> On Oct 20, 2015, at 9:12 AM, Frediano Ziglio <freddy77 at gmail.com> wrote:
>>>> 
>>>> Il 20/Ott/2015 09:09, "David Nichols" <david at qore.org> ha scritto:
>>>>> 
>>>>> On Oct 19, 2015, at 10:20 PM, Frediano Ziglio <freddy77 at gmail.com> wrote:
>>>>>> 
>>>>>> 2015-10-19 13:35 GMT+01:00 David Nichols <david at qore.org>:
>>>>>>> 
>>>>>>>> On Oct 19, 2015, at 1:53 PM, Frediano Ziglio <freddy77 at gmail.com>
>>>> wrote:
>>>>>>>> 
>>>>>>>> 2015-10-19 11:16 GMT+01:00 David Nichols <david at qore.org>:
>>>>>>>>> 
>>>>>>>>>> On Oct 18, 2015, at 10:06 AM, Frediano Ziglio <freddy77 at gmail.com>
>>>> wrote:
>>>>>>>>>> 
>>>>>>>>>> 2015-10-16 12:23 GMT+01:00 David Nichols <david at qore.org>:
>>>>>>>>>>>> 2015-06-09 14:48 GMT+01:00 Ondrej Holecek <ondrej.holecek at
>>>> qoretechnologies.com <http://lists.ibiblio.org/mailman/listinfo/freetds>>:
>>>>>>>>>>>>> Hi,
>>>>>>>>>>>>> 
>>>>>>>>>>>>> I made a test with the same code but sybase lib and it works like
>>>>>>>>>>>>> expected. It seems there is a bug in FreeTDS. Could you please
>>>> check
>>>>>>>>>>>>> my patch?
>>>>>>>>>>>>> 
>>>>>>>>>>>>> thx,
>>>>>>>>>>>>> 
>>>>>>>>>>>>> Ondrej
>>>>>>>>>>>>> 
>>>>>>>>>>>> 
>>>>>>>>>>>> Actually works and ctlib tests seems to pass.
>>>>>>>>>>>> 
>>>>>>>>>>>> However DONEINPROC is returned in a lot of cases, for instance if
>>>>>>>>>>>> database execute some trigger on the table so your patch can catch
>>>>>>>>>>>> some strange results too.
>>>>>>>>>>>> 
>>>>>>>>>>>> Which database version are you using?
>>>>>>>>>>>> 
>>>>>>>>>>>> Frediano
>>>>>>>>>>> Hi,
>>>>>>>>>>> 
>>>>>>>>>>> Ondra has not been working on this for quite some time, but I’d
>>>> like to pick up this issue again please.
>>>>>>>>>>> 
>>>>>>>>>>> We are using MS SQL Server 2008 - using tds version = 7.2  - with
>>>> the patch we are able to get the affected rows reliably - without it, we
>>>> are not.
>>>>>>>>>>> 
>>>>>>>>>>> Using the same patched library build with a Sybase (SAP) ASE 16.0
>>>> DB, it also gives correct results (with tds version = 5.0)
>>>>>>>>>>> 
>>>>>>>>>>> I would be happy to continue helping with this issue if there’s a
>>>> chance it could be included in freetds (or some other equally effective
>>>> fix).
>>>>>>>>>>> 
>>>>>>>>>>> thanks,
>>>>>>>>>>> David
>>>>>>>>>>> 
>>>>>>>>>> 
>>>>>>>>>> A fix was written for this case. Do you still have some code that
>>>>>>>>>> fails? Did you update FreeTDS?
>>>>>>>>>> 
>>>>>>>>>> Frediano
>>>>>>>>> 
>>>>>>>>> yes, I tried it with freetds from freetds-0.95.12 and git master -
>>>> both failed my tests and with the patch as provded by Ondra the tests then
>>>> passed.  Sorry I did not mention this in the original email.
>>>>>>>>> 
>>>>>>>> 
>>>>>>>> Please try a more recent version (like 0.95.21). Also you should sent
>>>>>>>> some extract of your tests. Can you post an updated patch?
>>>>>>>> 
>>>>>>> sorry it was a typo on my side - it was 0.95.21 that I tried.  Anyway
>>>> since it failed in git master then I would assume that would be more
>>>> relevant than the last stable release.
>>>>>>> 
>>>>>>> Attached please find a patch to git master sources that makes my tests
>>>> work.  Please note that we are using ctlib from freetds to build a DBI
>>>> driver for the Qore programming language to talk to SQL Server and Sybase
>>>> DBs; the same source builds with both the sybae libs and ctlib from
>>>> freetds.  Currently my tests are written in the Qore programming language,
>>>> so there are quite a few layers between the Qore code that’s executed and
>>>> freetds’s ctlib.
>>>>>>> 
>>>>>>> When this simple test works (ie only with a patch ctlib); the output
>>>> looks like this:
>>>>>>> 
>>>>>>> dnichols at manatee:~/src/qore/git/module-sybase/src$
>>>> simple-rows-affected-test.q
>>>>>>> "Microsoft SQL Server 2008 (RTM) - 10.0.1600.22 (X64)
>>>>>>>     Jul  9 2008 14:17:44
>>>>>>>     Copyright (c) 1988-2008 Microsoft Corporation
>>>>>>>     Developer Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601:
>>>> Service Pack 1)"
>>>>>>> insert: 1
>>>>>>> n delete: 0
>>>>>>> sel: {id: [1]}
>>>>>>> delete: 1
>>>>>>> insert: 1
>>>>>>> delete: 1
>>>>>>> 
>>>>>>> When it doesn’t work (ie with an unpatched ctlib), the output looks
>>>> like this:
>>>>>>> dnichols at manatee:~/src/qore/git/module-sybase/src$
>>>> simple-rows-affected-test.q
>>>>>>> "Microsoft SQL Server 2008 (RTM) - 10.0.1600.22 (X64)
>>>>>>>     Jul  9 2008 14:17:44
>>>>>>>     Copyright (c) 1988-2008 Microsoft Corporation
>>>>>>>     Developer Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601:
>>>> Service Pack 1)"
>>>>>>> insert: 0
>>>>>>> n delete: 0
>>>>>>> sel: {id: [1]}
>>>>>>> delete: 0
>>>>>>> insert: -1
>>>>>>> delete: -1
>>>>>>> 
>>>>>>> The Qore source to this simple test is attached for your reference.
>>>>>>> 
>>>>>> 
>>>>>> I applied the patch and improved a test to catch this issue. I changed
>>>>>> the patch slightly to check for TDS_NO_COUNT instead of <0 and
>>>>>> returning CS_CMD_SUCCEEDED as ct_res_info documentation
>>>>> 
>>>>> My test fails with your patch; if I change it back to:
>>>>>                              case _CS_RES_INIT:   /* command had no
>>>> result set */
>>>>>                                      if (tds->rows_affected !=
>>>> TDS_NO_COUNT) {
>>>>>                                              *result_type =
>>>> CS_CMD_DONE;
>>>>>                                              cmd->results_state =
>>>> _CS_RES_INIT;
>>>>>                                              return CS_SUCCEED;
>>>>>                                      }
>>>>>                                      break;
>>>>> 
>>>>> then it succeeds - please note that his is a hack from my side, I’m not
>>>> saying that the original approach is correct, just that my test fails
>>>> unless I set CS_CMD_DONE
>>>>> 
>>>>> thx
>>>>> David
>>>>> 
>>>> 
>>>> Cs_cmd_succeeded is a valid value and is expected to have rows number
>>>> attached so upper layer should handle it
>>> 
>>> OK, I see what you mean, however please note that with ctlib from Sybase/SAP ASE 16, I get the rows updated correctly with the same driver code as I use with freetds, and now it seems that I’ll need to update the driver to have a separate code path when it’s built with freetds - which seems to defeat the purpose of freetds’s ctlib.  Is it not possible to fix this issue and provide 100% backwards-compatibility with Sybase’s ctlib?
>>> 
>> 
>> @Frediano: sorry to bother you with this issue, but since it’s important for me, can you please let me know about the above - should I plan on having 2 code paths in my DB driver - one for Sybase and one for FreeTDS, or should there ideally be a way that compatibility between Sybase’s ctlib and FreeTDS’s ctlib can be provided regarding this issue?
>> 
>> thx
>> David
>> 
> 
> Hi David,
>  I checked again code and server replies and there is no
> incompatibility for the change.
> 
> I'll add a patch for this ASAP.
> 

thanks a lot; that’s really great news!
ciao
David

> Frediano
> _______________________________________________
> FreeTDS mailing list
> FreeTDS at lists.ibiblio.org
> http://lists.ibiblio.org/mailman/listinfo/freetds



More information about the FreeTDS mailing list