Stored Procedure Based Custom Conflict Resolver Truncates Data

May 17, 2007

I created a stored procedure based custom conflict resolver in SQL 2005, I return the winning result set and also save that result set to a test table to compare the values. The values saved to the test table are correct but some of the values saved as the conflict winter are truncated.

Example a char(3) filed is updated at the subscriber as €˜111€™ and updated at the publisher as €˜222€™, in my custom conflict resolver if I use the value from the subscriber the conflict resolver updates the field as €™11 €˜, if I use the publisher value the conflict resolver updates the field as €™22 €˜. Now the same records is saved to the test table correctly as either €˜111€™ or €˜222€™ depending on the logic I used. So the result set has the correct values, its after the custom conflict resolver is called where the values is somehow truncated. Has anybody run into this before and what steps can I take to avoid this.

Thank you,
Pauly C

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Need Help On COM-based Custom Conflict Resolver

Dec 21, 2006

Hi everyone,

I am working on a COM-based custom conflict resolver (vb.net) for a merge replication problem that I am having. This is what I am trying to accomplish. 1. Have a Last_Upd_Dt column. 2. When there is a conflict between publisher and subscriber on a column, the winner is the most recent date in Last_Upd_Dt and want the value for that column from that source. 3. If there is no conflict on a column and the column was updated by either the publisher or subscriber, I want to keep the change made by the publisher or the subscriber. (i.e publisher made change in col #1, subscriber made change in col #2, no conflict, the resulting row will now have the col #1 value from publisher, col # 2 will have value from subscriber. Essentially merging the changes.)

Does anyone have any examples of a COM-based Conflict Resolver that implements ICustomResolver for SQL Server 2005? Can this be done using the Business Logic Handler (examples?) ?

TIA

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Custom Conflict Resolver

Jan 26, 2006

Hi there,

I have created a custom conflict resolver for an article that is using Merge replication. I can register my custom resolver OK, I can change my merge article to use my new custom resolver, but when a conflict occures the replication monitor shows the following errors:

Error messages:


No signature was present in the subject.
(Source: MSSQL_REPL, Error number: MSSQL_REPL-2146762496)
Get help: http://help/MSSQL_REPL-2146762496

The Custom Resolver Component for article 'BRANCH' does not have a valid digital signature. (Source: MSSQL_REPL, Error number: MSSQL_REPL-2147198713)
Get help: http://help/MSSQL_REPL-2147198713

At first I thought it was because my assembly wasn't signed, so I signed it. I still get the same error.

I have various debug statements in the assembly and I can see that Initialize and HandleChangeStates gets called ok, but no other overrides.

Can anyone help me please?

Thanks

Graham

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Dec 5, 2006

Hi!



I'm trying to create a custom conflict resolver for SQL Server 2000 in
C# but i can't seem to find any source code examples of a *.dll where i
can actually see what needs to be done.



Any help is welcome.



Thanks

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Aug 12, 2005

Hi

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Oct 2, 2006



Hi all,

I need to write a custom conflict resolver for an application using merge replication. It's relatively simple logic - compare the two rows from the publisher and the subscriber and the winner is based on the value of one particular column.

Reading BOL gives me the input parameter list for the sp, and specifies that the output should be exactly the winning row. What is doesn't give is any example of how to do this, in particular how to access the two rows in conflict so that they can be compared.

I can do this by dynamically building SELECT statements, one connecting to the table locally on the publisher and another connecting to the subscriber using the form SERVER.DATABASE.OWNER.TABLE, but this requires me to explicitly have the subscriber as a linked server to do this. An example of my revolting code is appended to this post.

Is this what I have to do, or is there some table I can access on the publisher that has the conflicting rows in so I can compare them without going back to the subscriber?

Thanks for your help



Richard

---- code sample --

ALTER PROCEDURE [dbo].[prRep_ResolveInventoryConflicts]

@tableowner sysname, @tablename sysname, @rowguid uniqueidentifier,
@subscriber sysname, @subscriber_db sysname,
@log_conflict int OUTPUT, @conflict_message nvarchar(512) OUTPUT,
@destination_owner sysname

AS

BEGIN

DECLARE @qrySubscriber varchar(255)
DECLARE @qryPublisher varchar(255)
DECLARE @Publisher sysname
DECLARE @RecentCheck datetime

-- Temp table with same form as tbl_Inventory

CREATE TABLE #ConflictingRows (
[Machine] [sysname]NOT NULL,
[LocationID] [int] NOT NULL,
[PartGUID] [uniqueidentifier] NOT NULL,
[Qty] [int] NOT NULL ,
[LastUpdatedDtm] [datetime] NOT NULL,
[LastUpdatedUser] [varchar](50) NOT NULL ,
[rowguid] [uniqueidentifier] NOT NULL

)

-- Build the T-SQL To run against publisher and subscriber

SET @Publisher = @@Servername
SET @qryPublisher =
'INSERT INTO #ConflictingRows
SELECT '+@Publisher+' as Machine, * FROM '+@tableowner+'.'+@tablename+
'WHERE rowguid = '+CAST(@rowguid as varchar(40)) +';'

SET @qrySubscriber =
'INSERT INTO #ConflictingRows
SELECT '+@subscriber+ ' AS Machine, * FROM '+@subscriber+'.'+@subscriber_db+'.'+@tableowner+'.'+@tablename+
'WHERE rowguid = ' + CAST(@rowguid as varchar(40)) +';'

-- execute the stored procedures

EXECUTE @qryPublisher;
EXECUTE @qrySubscriber;

-- Compare the two rows and return the winning row, ie the one that was last updated by a human checking the inventory

SELECT @RecentCheck = MAX(LastUpdatedDtm) FROM #ConflictingRows

SELECT TOP 1 * FROM #ConflictingRows where LastUpdatedDtm=@RecentCheck;

-- Cleanup and exit

DROP TABLE #ConflictingRows

END

----

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Jan 18, 2007

Hi Everyone!
Here another post on replication.

When conflict occur, I want the user to be able to select witch row to keep and witch to delete.

I've look for system stored procedure, that could help me do the resolution but I've founded nothing.

So I've thought that I could do it by hand, with UPDATE/DELETE query
Take the row in the %TABLE_NAME%_Conflict table and copy it into the real table, than delete the row.

I this the good way of doing it?

Is there any other way?

Thanks !

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Thank you! Chris

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Aug 4, 2015

I have been evaluating merge replication, 'push' subscription on SQL Server 2014. If the default resolver is used (I refer to @article_resolver parameter of sp_addmergearticle), all seems to work as expected. However if I use "Microsoft SQL Server Subscriber Always Wins Conflict Resolver" (or any other MS standard resolver for that matter), if the Subscriber is on a different machine, the merge agent invariably gives the following error: "The process could not initialize <resolver_name>. Verify that the component is registered correctly."

This does not happen if the Subscriber is on the same machine as the Publisher and Distributor.

The problem seemed to exist in SQL Server 2008 according to some posts but it has been apparently fixed since then. I've tried the following:

- @partition_options = 0, as was suggested somewhere.

- Copied ssrpub.dll (the resolver dll) to the Subscriber machine (should not really matter as this is 'push' subscription?)

- Registered ssrpub.dll with regsvr32 on the Publisher/Distributor machine.

I've also run sp_enumcustomresolvers on the Publisher machine, and it happily showed all standard resolver, including the "Microsoft SQL Server Subscriber Always Wins Conflict Resolver".

Another thought is, I'm using SQL Server Express as the Subscriber (on the remote machine). Perhaps it does not support custom resolvers? (I'm using the full SQL Server in the 'local subscriber' variant, which does work OK as I mentioned before).

Note also that if I create a new publication via SSMS, the Resolver tab of the Article Properties dialog is empty, i.e. it does not list any resolver. The same tab contains the full list of resolvers though, if opened for an existing publication.

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Oct 12, 2007

I am using SQL 2005 build 9.0.2227

I have a custom conflict resolver - which fires on update conflicts (using row level tracking)

I have had a couple of occasions when the resolver has failed with the following error:

"The schema of the custom Dataset object implemented in the business logic handler does not match the schema of the source Dataset object. Verify that the custom Dataset object has been correctly defined"

In both cases I found that the row for which a conflict was being handled was not a conflict at all. One was a straightforward non conflicting update at the publisher and the other was a similar update at the subscriber.

I got round the problem by temporarily using a fix version of the conflict resolver dll that either set the custom Dataset to the publisher dataset or the subscriber dataset - depending on where the update had occurred.

When the first error (publisher update) occurred - the resolver code was basing the custom dataset on the publisher dataset - which was presumably empty - so I changed the code to base the custom dataset on the subscriber dataset. The second error therefore occurred when the custom dataset was based on the subscriber dataset - which again was presumably empty

Note that the tables involved in each occasion were different and neither table is filtered.

Is there a known bug in this area?

I am considering trying to change the resolver code to identify false conflicts in order to workround the problem - but this would be difficult to test as I can't reproduce the problem

aero1

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@DISPOSAL_AREA_NAME [DISPOSAL_AREA_NAME_TYPE:varchar(40)] = ""
AS
BEGIN

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Sep 26, 2007

Hi all,

here is the context of our problem:
- Publisher : version SQL Server 2005 SP2, table in SQL Server 2000 (80) compatibility level, publication in SQL Server 2000 compatibility level
- Distributor : SQL Server 2005 SP2
- Subscriber : SQL Server 2000 SP4 + hotfixes (version 8.00.2187)

There is only one article in our publication (a simple table with a GUID and a nvarchar(50) columns), and we have left the default resolver.

1 - The first synchronization of the subscription is successfully completed, and it is the same for the different updates/inserts/deletes or conflicts.

2 - Then we change the Resolver of our article by our own COM-Based Custom Resolver (developped in C# 2.0). This resolver only change the default behaviour: the subscriber always win (this is for a test, in the future we will have a complex business logic). All the synchronizations works fine and do what we want in the conflicts.

3 - We rollback the resolver to the default one... and here is the problem!

The synchonizations stop to work correctly. For all of them we've got the same error:
quote:Replprov.dll , 2007/09/25 14:26:07.591, 4000, 16890, S1, ERROR: ErrNo = 0x80045017, ErrSrc = <null>, ErrType = 8, ErrStr = The schema script '
declare @cmd nvarchar(1000)
set @cmd='exec sys.sp_MSchangearticleresolver @article_resolver=@ar, @resolver_clsid=@rc, @artid=@ai, @resolver_info=@ri'
exec dbo.sp_executesql @cmd, N'@ar> nvarchar(255),@rc nvarchar(40),@ai uniqueidentifie..." mailto:N?@ar">N'@armailto:N'@ar">N'@ar</A< A>> nvarchar(255),@rc nvarchar(40),@ai uniqueidentifie...

It is no more possible to synchronize this subscription... Any remark will be helpfull cause we did not find anything on the net concerning this error.

Thanks a lot!

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Sep 7, 2006

Hi there!




I'm trying to create a custom resolver for merge replication exactly like in the MS example.


It seems to work, but only ONE time. If I change, insert or delete a
record in a table the second time, the subscriber monitor comes with
the following errors:




Error messages:

Attempted to read or write protected memory. This is often an
indication that other memory is corrupt. (Source: MSSQL_REPL, Error
number: MSSQL_REPL-2147199411)



The Merge Agent encountered an error when executing code in the
'UpdateHandler' method implemented in the business logic handler
'D:Program FilesMicrosoft SQL Server90COMMyResolver.dll'. Ensure
that the overridden 'UpdateHandler' method has been properly
implemented in the business logic handler. (Source: MSSQL_REPL,
Error number: MSSQL_REPL-2147199411)



This last error is of course dependant on my action (update, delete, insert).

My code is -exactly- like the example (I just stripped out the log message).



Does anyone know why I am "trying to read or write protected memory" ?



The thing is that I'm trying to create an application that detects if a
table changes. Is this the right way to do this anyway or are there
better solutions?



Any help is appreciated! Thanks!

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Any suggestions would be appreciated.

Cheers

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John Smith

- Jacob Jones
- Lisa Thompson
- Samuel Barber

- Paul Smith
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Ok, so Jacob, Lisa, an Samuel report up to John Smith. Paul and John Jackson report up to Samuel Barber.

Here are the tables:

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File_Name4 (From the sp)
File_Name3 (From the sp)



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-------------------------------------------------------------------------------------------
Edited: I still am trying to work this out. I've tried a few run-arounds but none have worked. Adding custom code apparently is too risky at this point because of the security precautions that I've been instructed to take. Any help would be greatly appreciated as this project has been going on for days now....

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Hi all,

here is the context of our problem:

- Publisher :

version SQL Server 2005 SP2
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- Distributor : SQL Server 2005 SP2
- Subscriber : SQL Server 2000 SP4 + hotfixes (version 8.00.2187)

There is only one article in our publication (a simple table with a GUID and a nvarchar(50) columns), and we have left the default resolver.

1 - The first synchronization of the subscription is successfully completed, and it is the same for the different updates/inserts/deletes or conflicts.

2 - Then we change the Resolver of our article by our own COM-Based Custom Resolver (developped in C# 2.0). This resolver only change the default behaviour: the subscriber always win (this is for a test, in the future we will have a complex business logic). All the synchronizations works fine and do what we want in the conflicts.

3 - We rollback the resolver to the default one... and here is the problem!
The synchonizations stop to work correctly. For all of them we've got the same error:



Code SnippetReplprov.dll , 2007/09/25 14:26:07.591, 4000, 16890, S1, ERROR: ErrNo = 0x80045017, ErrSrc = <null>, ErrType = 8, ErrStr = The schema script '
declare @cmd nvarchar(1000)
set @cmd='exec sys.sp_MSchangearticleresolver @article_resolver=@ar, @resolver_clsid=@rc, @artid=@ai, @resolver_info=@ri'
exec dbo.sp_executesql @cmd, N'@ar> nvarchar(255),@rc nvarchar(40),@ai uniqueidentifie..." mailto:N?@ar">N'@armailto:N'@ar">N'@ar</A< A>> nvarchar(255),@rc nvarchar(40),@ai uniqueidentifie...




It is no more possible to synchronize this subscription... Any remark will be helpfull cause we did not find anything on the net concerning this error.

Thanks a lot!

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Result Set: None
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Hi all,

I
am doing a work were i have to syncronize data between a Publiser
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studied lots of articles and i managed to put the syncronization to
work, the problem is in conflict resolution!

The subscriber can΄t insert or delet, only update!!



For exmple: I have a table that contais the quantity of a product X,
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in my own stored procedure i'll have to do some calculations to get the
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Maybe you have experienced some problem like this, and could help me!

How should i do the stored procedure?

Oh, i tried to use de addiction resolver and the average resolver
of com based but nothing happed, dont know why, i read some stuff and
i think the addition could solve my problem, but it doesn΄t work, i read above what you said and installed service
pack 1 for sql 2005, but i instaled and nothing
happened!
When i change to the resolver that the subscriver wins, it works, why addition dont work?

Thanx

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aero1

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Oct 22, 2006

Hi,    I am trying to implement filtering on a custome paged stored Procedure, here is my curent Stored Procedure which doesn't error on complie or run but returns no records. Anyone got any ideas on how to make this work???<Stored Procedure>set ANSI_NULLS ONset QUOTED_IDENTIFIER ONgo-- =============================================-- Author:        Peter Annandale-- Create date: 22/10/2006-- Description:    Get Filtered Names-- =============================================ALTER PROCEDURE [dbo].[proc_NAMEFilterPaged]     -- Add the parameters for the stored procedure here    @startRowIndex int,     @maximumRows int,    @columnName varchar(20),    @filterValue varchar(20)ASBEGIN    -- SET NOCOUNT ON added to prevent extra result sets from    -- interfering with SELECT statements.    SET NOCOUNT ON;SELECT CODE, LAST_NAME, Name, TYPE, NUMBER    FROM         (SELECT n.CODE, n.LAST_NAME, n.FIRST_NAME + '  ' + n.MIDDLE_NAME AS Name, nt.TYPE, f.NUMBER,            ROW_NUMBER() OVER(ORDER BY n.LAST_NAME) as RowNum        FROM dbo.NAME n             LEFT OUTER JOIN NAMETYPE nt ON n.NAME_TYPE = nt.NAME_TYPE            LEFT OUTER JOIN FUNERAL f ON n.CODE = f.DECEASED        WHERE @columnName LIKE @filterValue        ) as NameInfo    WHERE RowNum BETWEEN @startRowIndex AND (@startRowIndex + @maximumRows) -1END </Stored Procedure> Any assistance would be greatly appreciated.. Regards..Peter. 

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Stored Procedure To Generate Custom ID For Each Asset

Jan 7, 2012

I need creating a store procedure which generates custom IDs for each asset. I am programming for Fixed Assets in VB6 with SQL Server 2005. For example, when a new Asset is added ,I need to auto generate the ID based on existing IDs. New ID should not exist in tblAssets table.

Table Name : tblAssets
Fields : AssetID > Int,Primary Key,this is internal ID (identity seed)
AssetExtID >nvarchar(50),this is external ID, need to generate/user entered.

Below is the example of data in tblAssets :

AssetID AssetExtID ProjectID ItemName Qty UOM UnitCost .....
1 PROSP-00001 PROSPERITY SPLIT-AC 2 NOS $200
2 PROSP-00002 PROSPERITY LAPTOP 1 NOS $500
3 UNIII-00001 UNION III LAPTOP 5 NOS $400
4 UNIII-00002 UNION III RECEIVER 2 NOS $312

The AssetExtID depends on the ProjectID which is in tblProjects.

I will take care of the first 5 characters to generate. But the number part I need to generate by checking existing data. The AssetExtID should not be duplicate. Its unique for each asset.

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SQL Server Truncates Data

Jan 6, 2006

How come no matter what I do SQL server always truncates my dates when they are saved to the database? I save a complete date like 1/1/1900 6:13:42 and no matter what I do it always truncates the seconds off of all my dates, so I always get 1/1/1900 6:13:00. It makes no since because when I save the record the seconds are there, but when I pull it back up they are always gone.

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Sql Ntext Data Truncates In Asp

Feb 27, 2006

The sql database has an ntext (16) field which contains "information" and is used as a free form turnover log. When I bring this data into an ASP page the "information" gets truncated.

I have tried getchunk, however all formatting on the field is lost.
I have tried putting the field at the end of my query - no change.
I have tried querying the data as a separate sqlrs connection - no change.
I have tried using substring to break it down, the first substring works, however I get errors on the second (Expression result length exceeds the maximum. 8000 max, 12000 found).

I also tried to use substring in sql query anaylzer - and only get the first ~4180 characters.

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SqlDataSource Custom SQL Statement Vs Stored Procedure Permission Problem

May 8, 2008

PLEASE PLEASE PLEASE......
I did not get a single response for the last 6 hours... And during this time I was searching and trying to understand the problem but I am really stuck. If this is the wrong forum to ask this question, please redirect me. Really begging for replies...[:'(]
If I use the custom SQL statements in SqlDataSource, the application runs fine within the development environment (VS2005) but errors out if I publish the web site and access outside of the environment. In order to find-out the problem, I made the following test:
I created a select statement in one SqlDataSource to fill-in a GridView. I used the exact same statement to create a stored procedure and used that SP in second SqlDataSource and I fill a second GridView. When I debug or run the application, both grids are filled OK and everything works fine. However, when I publish the web site and try to do same only the stored procedure works fine and when I try to fill the grid using the built-in SQL, the page gives error. The error mesage is as follows when I use the address 'localhost':
Server Error in '/' Application.


The SELECT permission was denied on the object 'Contacts', database 'Homer', schema 'dbo'.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: The SELECT permission was denied on the object 'Contacts', database 'Homer', schema 'dbo'.Source Error:



An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:



[SqlException (0x80131904): The SELECT permission was denied on the object 'Contacts', database 'Homer', schema 'dbo'.]
System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection) +859322.......da da da .......
If I access the page using the IP address the message chages to below but it is not the issue, I just give it if it helps to find the problem:
Server Error in '/' Application.


Runtime Error
Description: An application error occurred on the server. The current custom error settings for this application prevent the details of the application error from being viewed remotely (for security reasons). It could, however, be viewed by browsers running on the local server machine. Details: To enable the details of this specific error message to be viewable on remote machines, please create a <customErrors> tag within a "web.config" configuration file located in the root directory of the current web application. This <customErrors> tag should then have its "mode" attribute set to "Off". 
My SqlDataSource s are like this: <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:HomerConnectionString %>"
SelectCommand="TestRemoteAccess" SelectCommandType="StoredProcedure">
<SelectParameters>
<asp:ControlParameter ControlID="TextBox1" Name="Param1" PropertyName="Text" Type="Int32" />
</SelectParameters>
</asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource2" runat="server" ConnectionString="<%$ ConnectionStrings:HomerConnectionString %>"
SelectCommand="SELECT FirstName, LastName, Business FROM Contacts WHERE (ContactID = @Param1)">
<SelectParameters>
<asp:ControlParameter ControlID="TextBox2" Name="Param1" PropertyName="Text" />
</SelectParameters>
</asp:SqlDataSource>

 
 Environment: SQL Server 2005, VS2005, Vista
 

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Mar 11, 2008

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Dan

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