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DW Synchronization and Original! buffer

6 posts in General Discussion (old) Last posting was on 2000-03-20 22:22:09.0Z
Vladimir Uzlaner Posted on 2000-03-17 16:44:48.0Z
Newsgroups: sybase.public.easerver
From: "Vladimir Uzlaner" <vuzlaner@telsource.com>
Organization: 209.123.44.169
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Subject: DW Synchronization and Original! buffer
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Hi, all

I get infamous message 'Data changed between Retrieve and Update'. I am using DW
Synchronization and it not completely clear the mechanism.

First of all about the problem. User Retrieve the data , change one column,
click 'Save' button and update DataWindow( all flags are reseted ). Then he/she
decided change another column without reretrieving, does it, click 'Save' button
and then getting this message.
'Updatable and Key columns' option is used for generating WHERE clause.

I bind parameter and see in the error message, that PB put in where clause value
of the column that was before updating, this is the problem. I suppose after
updating and resetting flags, all data in Original! buffer should be replaced
with renewed Primary! to avoid reretrieving. But it looks like it doesn't
happens!

Again, how I see this mechanism:
1. Retrieve(): Original! and Primary! buffers are identical.
2. User changes columns or developer SetItem(), data and flags in Primary!
buffer are changed.
3. Update(): PB issuing UPDATE statement to Database, for WHERE clause it use
data from Original! buffer, to be sure, the data in Database was not updated
before by somebody else.
4. Successful updating the Database, reseting flags.
5. Copying data from Primary! buffer to Original! buffer to make them identical.

It looks like last step is not processing. I tried to do it manually through dot
notation:

dw_contract.Object.Data.Primary.Original = dw_contract.Object.Data

, but I get garbage in my DataWindow after that.

Any idea?

Thank you in advance,
Vladimir Uzlaner


---== Posted via the PFCGuide Web Newsreader ==---
http://www.pfcguide.com/_newsgroups/group_list.asp


Philip Salgannik Posted on 2000-03-17 16:54:31.0Z
Newsgroups: sybase.public.easerver
From: "Philip Salgannik" <psalgannik@softrax.com>
Subject: Re: DW Synchronization and Original! buffer
Date: Fri, 17 Mar 2000 11:54:31 -0500
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You need to reselect the row after the update (or reretrieve the dw),
resetting the flags means just that - resetting the internal flags about the
state of modified/deleted data...

--
pbm_thisusuallydoesnothelp :-))

"Vladimir Uzlaner" <vuzlaner@telsource.com> wrote in message
news:1hpZbADk$GA.201@forums.sybase.com...
> Hi, all
>
> I get infamous message 'Data changed between Retrieve and Update'. I am
using DW
> Synchronization and it not completely clear the mechanism.
>
> First of all about the problem. User Retrieve the data , change one
column,
> click 'Save' button and update DataWindow( all flags are reseted ). Then
he/she
> decided change another column without reretrieving, does it, click 'Save'
button
> and then getting this message.
> 'Updatable and Key columns' option is used for generating WHERE clause.
>
> I bind parameter and see in the error message, that PB put in where clause
value
> of the column that was before updating, this is the problem. I suppose
after
> updating and resetting flags, all data in Original! buffer should be
replaced
> with renewed Primary! to avoid reretrieving. But it looks like it doesn't
> happens!
>
> Again, how I see this mechanism:
> 1. Retrieve(): Original! and Primary! buffers are identical.
> 2. User changes columns or developer SetItem(), data and flags in Primary!
> buffer are changed.
> 3. Update(): PB issuing UPDATE statement to Database, for WHERE clause it
use
> data from Original! buffer, to be sure, the data in Database was not
updated
> before by somebody else.
> 4. Successful updating the Database, reseting flags.
> 5. Copying data from Primary! buffer to Original! buffer to make them
identical.
>
> It looks like last step is not processing. I tried to do it manually
through dot
> notation:
>
> dw_contract.Object.Data.Primary.Original = dw_contract.Object.Data
>
> , but I get garbage in my DataWindow after that.
>
> Any idea?
>
> Thank you in advance,
> Vladimir Uzlaner
>
>
> ---== Posted via the PFCGuide Web Newsreader ==---
> http://www.pfcguide.com/_newsgroups/group_list.asp


Vladimir Uzlaner Posted on 2000-03-17 17:29:10.0Z
Newsgroups: sybase.public.easerver
From: "Vladimir Uzlaner" <vuzlaner@telsource.com>
Organization: 209.123.44.169
X-Newsreader: AspNNTP 1.41 (Advent 2000, Inc.)
Subject: Re: DW Synchronization and Original! buffer
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Article PK: 156854

I agree with you Philip, but isn't it looks insane:

- in data traffic sensetive n-tire application, reretrieve data that already
retrieved just because PB internally doesn't refresh Original! buffer after
updating?

Or I am wrong?

Thank you,
Vladimir Uzlaner

On Fri, 17 Mar 2000 11:54:31 -0500,
in powersoft.public.easerver

Philip Salgannik <psalgannik@softrax.com> wrote:
>You need to reselect the row after the update (or reretrieve the dw),
>resetting the flags means just that - resetting the internal flags about the
>state of modified/deleted data...
>
>--
>pbm_thisusuallydoesnothelp :-))
>
>"Vladimir Uzlaner" <vuzlaner@telsource.com> wrote in message
>news:1hpZbADk$GA.201@forums.sybase.com...
>> Hi, all
>>
>> I get infamous message 'Data changed between Retrieve and Update'. I am
>using DW
>> Synchronization and it not completely clear the mechanism.
>>
>> First of all about the problem. User Retrieve the data , change one
>column,
>> click 'Save' button and update DataWindow( all flags are reseted ). Then
>he/she
>> decided change another column without reretrieving, does it, click 'Save'
>button
>> and then getting this message.
>> 'Updatable and Key columns' option is used for generating WHERE clause.
>>
>> I bind parameter and see in the error message, that PB put in where clause
>value
>> of the column that was before updating, this is the problem. I suppose
>after
>> updating and resetting flags, all data in Original! buffer should be
>replaced
>> with renewed Primary! to avoid reretrieving. But it looks like it doesn't
>> happens!
>>
>> Again, how I see this mechanism:
>> 1. Retrieve(): Original! and Primary! buffers are identical.
>> 2. User changes columns or developer SetItem(), data and flags in Primary!
>> buffer are changed.
>> 3. Update(): PB issuing UPDATE statement to Database, for WHERE clause it
>use
>> data from Original! buffer, to be sure, the data in Database was not
>updated
>> before by somebody else.
>> 4. Successful updating the Database, reseting flags.
>> 5. Copying data from Primary! buffer to Original! buffer to make them
>identical.
>>
>> It looks like last step is not processing. I tried to do it manually
>through dot
>> notation:
>>
>> dw_contract.Object.Data.Primary.Original = dw_contract.Object.Data
>>
>> , but I get garbage in my DataWindow after that.
>>
>> Any idea?
>>
>> Thank you in advance,
>> Vladimir Uzlaner
>>
>>
>> ---== Posted via the PFCGuide Web Newsreader ==---
>> http://www.pfcguide.com/_newsgroups/group_list.asp
>

---== Posted via the PFCGuide Web Newsreader ==---
http://www.pfcguide.com/_newsgroups/group_list.asp


Philip Salgannik Posted on 2000-03-17 18:13:49.0Z
Newsgroups: sybase.public.easerver
From: "Philip Salgannik" <psalgannik@softrax.com>
Subject: Re: DW Synchronization and Original! buffer
Date: Fri, 17 Mar 2000 13:13:49 -0500
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You are. It always worked this way.
And what datawindow buffer as a concept has to do with distributed
computing?

--
pbm_thisusuallydoesnothelp :-))

"Vladimir Uzlaner" <vuzlaner@telsource.com> wrote in message
news:98DMOZDk$GA.111@forums.sybase.com...
> I agree with you Philip, but isn't it looks insane:
>
> - in data traffic sensetive n-tire application, reretrieve data that
already
> retrieved just because PB internally doesn't refresh Original! buffer
after
> updating?
>
> Or I am wrong?
>
> Thank you,
> Vladimir Uzlaner
>
> On Fri, 17 Mar 2000 11:54:31 -0500,
> in powersoft.public.easerver
> Philip Salgannik <psalgannik@softrax.com> wrote:
> >You need to reselect the row after the update (or reretrieve the dw),
> >resetting the flags means just that - resetting the internal flags about
the
> >state of modified/deleted data...
> >
> >--
> >pbm_thisusuallydoesnothelp :-))
> >
> >"Vladimir Uzlaner" <vuzlaner@telsource.com> wrote in message
> >news:1hpZbADk$GA.201@forums.sybase.com...
> >> Hi, all
> >>
> >> I get infamous message 'Data changed between Retrieve and Update'. I am
> >using DW
> >> Synchronization and it not completely clear the mechanism.
> >>
> >> First of all about the problem. User Retrieve the data , change one
> >column,
> >> click 'Save' button and update DataWindow( all flags are reseted ).
Then
> >he/she
> >> decided change another column without reretrieving, does it, click
'Save'
> >button
> >> and then getting this message.
> >> 'Updatable and Key columns' option is used for generating WHERE clause.
> >>
> >> I bind parameter and see in the error message, that PB put in where
clause
> >value
> >> of the column that was before updating, this is the problem. I suppose
> >after
> >> updating and resetting flags, all data in Original! buffer should be
> >replaced
> >> with renewed Primary! to avoid reretrieving. But it looks like it
doesn't
> >> happens!
> >>
> >> Again, how I see this mechanism:
> >> 1. Retrieve(): Original! and Primary! buffers are identical.
> >> 2. User changes columns or developer SetItem(), data and flags in
Primary!
> >> buffer are changed.
> >> 3. Update(): PB issuing UPDATE statement to Database, for WHERE clause
it
> >use
> >> data from Original! buffer, to be sure, the data in Database was not
> >updated
> >> before by somebody else.
> >> 4. Successful updating the Database, reseting flags.
> >> 5. Copying data from Primary! buffer to Original! buffer to make them
> >identical.
> >>
> >> It looks like last step is not processing. I tried to do it manually
> >through dot
> >> notation:
> >>
> >> dw_contract.Object.Data.Primary.Original = dw_contract.Object.Data
> >>
> >> , but I get garbage in my DataWindow after that.
> >>
> >> Any idea?
> >>
> >> Thank you in advance,
> >> Vladimir Uzlaner
> >>
> >>
> >> ---== Posted via the PFCGuide Web Newsreader ==---
> >> http://www.pfcguide.com/_newsgroups/group_list.asp
> >
>
> ---== Posted via the PFCGuide Web Newsreader ==---
> http://www.pfcguide.com/_newsgroups/group_list.asp


Vladimir Uzlaner Posted on 2000-03-17 21:20:25.0Z
Newsgroups: sybase.public.easerver
From: "Vladimir Uzlaner" <vuzlaner@telsource.com>
Organization: 209.123.44.169
X-Newsreader: AspNNTP 1.41 (Advent 2000, Inc.)
Subject: Re: DW Synchronization and Original! buffer
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Article PK: 156836

From my point of view, DataWindow buffer concept is very benefical in
distributed computing too. It allows user insert, delete, update as many rows as
he/she wants in DataWindows on client side , to update database later in one
'Save' button hit( in one Update() function call). It is signifacant reduce
bothering the Database engine with queries and little bit reduce network traffic
if you update Database row by row.

I am not sure if I faced this problem with Original! buffer in 2-tire
application. Maybe it is DW synchronization flaw?

Thanks,
Vladimir Uzlaner

On Fri, 17 Mar 2000 13:13:49 -0500,
in powersoft.public.easerver

Philip Salgannik <psalgannik@softrax.com> wrote:
>You are. It always worked this way.
>And what datawindow buffer as a concept has to do with distributed
>computing?
>
>--
>pbm_thisusuallydoesnothelp :-))
>
>"Vladimir Uzlaner" <vuzlaner@telsource.com> wrote in message
>news:98DMOZDk$GA.111@forums.sybase.com...
>> I agree with you Philip, but isn't it looks insane:
>>
>> - in data traffic sensetive n-tire application, reretrieve data that
>already
>> retrieved just because PB internally doesn't refresh Original! buffer
>after
>> updating?
>>
>> Or I am wrong?
>>
>> Thank you,
>> Vladimir Uzlaner
>>
>> On Fri, 17 Mar 2000 11:54:31 -0500,
>> in powersoft.public.easerver
>> Philip Salgannik <psalgannik@softrax.com> wrote:
>> >You need to reselect the row after the update (or reretrieve the dw),
>> >resetting the flags means just that - resetting the internal flags about
>the
>> >state of modified/deleted data...
>> >
>> >--
>> >pbm_thisusuallydoesnothelp :-))
>> >
>> >"Vladimir Uzlaner" <vuzlaner@telsource.com> wrote in message
>> >news:1hpZbADk$GA.201@forums.sybase.com...
>> >> Hi, all
>> >>
>> >> I get infamous message 'Data changed between Retrieve and Update'. I am
>> >using DW
>> >> Synchronization and it not completely clear the mechanism.
>> >>
>> >> First of all about the problem. User Retrieve the data , change one
>> >column,
>> >> click 'Save' button and update DataWindow( all flags are reseted ).
>Then
>> >he/she
>> >> decided change another column without reretrieving, does it, click
>'Save'
>> >button
>> >> and then getting this message.
>> >> 'Updatable and Key columns' option is used for generating WHERE clause.
>> >>
>> >> I bind parameter and see in the error message, that PB put in where
>clause
>> >value
>> >> of the column that was before updating, this is the problem. I suppose
>> >after
>> >> updating and resetting flags, all data in Original! buffer should be
>> >replaced
>> >> with renewed Primary! to avoid reretrieving. But it looks like it
>doesn't
>> >> happens!
>> >>
>> >> Again, how I see this mechanism:
>> >> 1. Retrieve(): Original! and Primary! buffers are identical.
>> >> 2. User changes columns or developer SetItem(), data and flags in
>Primary!
>> >> buffer are changed.
>> >> 3. Update(): PB issuing UPDATE statement to Database, for WHERE clause
>it
>> >use
>> >> data from Original! buffer, to be sure, the data in Database was not
>> >updated
>> >> before by somebody else.
>> >> 4. Successful updating the Database, reseting flags.
>> >> 5. Copying data from Primary! buffer to Original! buffer to make them
>> >identical.
>> >>
>> >> It looks like last step is not processing. I tried to do it manually
>> >through dot
>> >> notation:
>> >>
>> >> dw_contract.Object.Data.Primary.Original = dw_contract.Object.Data
>> >>
>> >> , but I get garbage in my DataWindow after that.
>> >>
>> >> Any idea?
>> >>
>> >> Thank you in advance,
>> >> Vladimir Uzlaner
>> >>
>> >>
>> >> ---== Posted via the PFCGuide Web Newsreader ==---
>> >> http://www.pfcguide.com/_newsgroups/group_list.asp
>> >
>>
>> ---== Posted via the PFCGuide Web Newsreader ==---
>> http://www.pfcguide.com/_newsgroups/group_list.asp
>

---== Posted via the PFCGuide Web Newsreader ==---
http://www.pfcguide.com/_newsgroups/group_list.asp


Vladimir Uzlaner Posted on 2000-03-20 22:22:09.0Z
Newsgroups: sybase.public.easerver
From: "Vladimir Uzlaner" <vuzlaner@telsource.com>
Organization: 209.123.44.169
X-Newsreader: AspNNTP 1.41 (Advent 2000, Inc.)
Subject: Re: DW Synchronization and Original! buffer
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Article PK: 156056

I am very sorry I started this thread on this Newsgroup, I thought it was
related to DW synchronization. I resolved this problem. Before I learnt many
messages from powerbuilder.general newsgroup about this problem, and there were
a lot of messaged on this theme, but all them were not like mine.

We have 'Last_Update_UserID' field to track who is the last person updated the
row. Usually this field is updated in triggers, but we do it in the script using
SetItem() function. The problem is this field has only 5 char length, but in the
SetItem() we set Employee ID with more letters.

How I see this problem. Let's say Employee ID is 'billnigh':

1. After user changed the DataWindow, clicked 'Save' button, call Update()
function, reseted all flags, PowerBuilder refresh Original! buffer. But during
updating the Database, 'Last_Update_UserID' field is truncated with 'billn', and
Original! buffer is refreshed with this value.

2. User make another changes, in program we SetItem() with 'billnigh' and
PowerBuilder indicate that 'Data was changed between retrieve and update'.

Thank you and sorry.

P.S. Philip, now it is working without reretrieving the data, so probably you
have to find the problem like that, although it is not so easy. In
powerbuilder.general Newsgroup many situation are described, but not always are
the same like what we face.

On Fri, 17 Mar 2000 16:20:25 -0500,
in powersoft.public.easerver

Vladimir Uzlaner <vuzlaner@telsource.com> wrote:
>From my point of view, DataWindow buffer concept is very benefical in
>distributed computing too. It allows user insert, delete, update as many rows
as
>he/she wants in DataWindows on client side , to update database later in one
>'Save' button hit( in one Update() function call). It is signifacant reduce
>bothering the Database engine with queries and little bit reduce network
traffic
>if you update Database row by row.
>
>I am not sure if I faced this problem with Original! buffer in 2-tire
>application. Maybe it is DW synchronization flaw?
>
>Thanks,
> Vladimir Uzlaner
>
>On Fri, 17 Mar 2000 13:13:49 -0500,
> in powersoft.public.easerver
>Philip Salgannik <psalgannik@softrax.com> wrote:
>>You are. It always worked this way.
>>And what datawindow buffer as a concept has to do with distributed
>>computing?
>>
>>--
>>pbm_thisusuallydoesnothelp :-))
>>
>>"Vladimir Uzlaner" <vuzlaner@telsource.com> wrote in message
>>news:98DMOZDk$GA.111@forums.sybase.com...
>>> I agree with you Philip, but isn't it looks insane:
>>>
>>> - in data traffic sensetive n-tire application, reretrieve data that
>>already
>>> retrieved just because PB internally doesn't refresh Original! buffer
>>after
>>> updating?
>>>
>>> Or I am wrong?
>>>
>>> Thank you,
>>> Vladimir Uzlaner
>>>
>>> On Fri, 17 Mar 2000 11:54:31 -0500,
>>> in powersoft.public.easerver
>>> Philip Salgannik <psalgannik@softrax.com> wrote:
>>> >You need to reselect the row after the update (or reretrieve the dw),
>>> >resetting the flags means just that - resetting the internal flags about
>>the
>>> >state of modified/deleted data...
>>> >
>>> >--
>>> >pbm_thisusuallydoesnothelp :-))
>>> >
>>> >"Vladimir Uzlaner" <vuzlaner@telsource.com> wrote in message
>>> >news:1hpZbADk$GA.201@forums.sybase.com...
>>> >> Hi, all
>>> >>
>>> >> I get infamous message 'Data changed between Retrieve and Update'. I am
>>> >using DW
>>> >> Synchronization and it not completely clear the mechanism.
>>> >>
>>> >> First of all about the problem. User Retrieve the data , change one
>>> >column,
>>> >> click 'Save' button and update DataWindow( all flags are reseted ).
>>Then
>>> >he/she
>>> >> decided change another column without reretrieving, does it, click
>>'Save'
>>> >button
>>> >> and then getting this message.
>>> >> 'Updatable and Key columns' option is used for generating WHERE clause.
>>> >>
>>> >> I bind parameter and see in the error message, that PB put in where
>>clause
>>> >value
>>> >> of the column that was before updating, this is the problem. I suppose
>>> >after
>>> >> updating and resetting flags, all data in Original! buffer should be
>>> >replaced
>>> >> with renewed Primary! to avoid reretrieving. But it looks like it
>>doesn't
>>> >> happens!
>>> >>
>>> >> Again, how I see this mechanism:
>>> >> 1. Retrieve(): Original! and Primary! buffers are identical.
>>> >> 2. User changes columns or developer SetItem(), data and flags in
>>Primary!
>>> >> buffer are changed.
>>> >> 3. Update(): PB issuing UPDATE statement to Database, for WHERE clause
>>it
>>> >use
>>> >> data from Original! buffer, to be sure, the data in Database was not
>>> >updated
>>> >> before by somebody else.
>>> >> 4. Successful updating the Database, reseting flags.
>>> >> 5. Copying data from Primary! buffer to Original! buffer to make them
>>> >identical.
>>> >>
>>> >> It looks like last step is not processing. I tried to do it manually
>>> >through dot
>>> >> notation:
>>> >>
>>> >> dw_contract.Object.Data.Primary.Original = dw_contract.Object.Data
>>> >>
>>> >> , but I get garbage in my DataWindow after that.
>>> >>
>>> >> Any idea?
>>> >>
>>> >> Thank you in advance,
>>> >> Vladimir Uzlaner
>>> >>
>>> >>
>>> >> ---== Posted via the PFCGuide Web Newsreader ==---
>>> >> http://www.pfcguide.com/_newsgroups/group_list.asp
>>> >
>>>
>>> ---== Posted via the PFCGuide Web Newsreader ==---
>>> http://www.pfcguide.com/_newsgroups/group_list.asp
>>
>
>---== Posted via the PFCGuide Web Newsreader ==---
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