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SQL Server rowversion and order


SQL Server rowversion and order

By : user2954344
Date : November 22 2020, 01:01 AM
With these it helps The time of the increment is at the time of the change of the row, irrespective of when the transaction commits:
Example. (Note @@dbts is the current database rowversion value.)
code :
select @@version
create table t (c int, rv rowversion)
go
begin transaction
print @@dbts
insert into t (c) values (1)
print @@dbts
insert into t (c) values (2)
print @@dbts
insert into t (c) values (3)
print @@dbts
commit
select * from t
Microsoft SQL Server 2014 - 12.0.2254.0 (X64)
Jul 25 2014 18:52:51
Copyright (c) Microsoft Corporation
Enterprise Edition (64-bit) on Windows NT 6.1 <X64>
(Build 7601: Service Pack 1) (Hypervisor) 

0x00000000000007D0
0x00000000000007D1
0x00000000000007D2
0x00000000000007D3

C   RV
1   0x00000000000007D1
2   0x00000000000007D2
3   0x00000000000007D3


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SQL Server RowVersion

SQL Server RowVersion


By : Springy
Date : March 29 2020, 07:55 AM
I wish this helpful for you If you are using LINQ to SQL then it is a good practice to include a timestamp / rowversion column for each entity table, as this allows LINQ to use optimistic concurrency very easily and results in slightly better performance for updates (as LINQ only has to query the timestamp column and does not have to compare other columns for changes).
So go for the first option. The second option is a non-starter, really.
SQL Server database max row RowVersion

SQL Server database max row RowVersion


By : NicolaDebernardi
Date : March 29 2020, 07:55 AM
Hope that helps Are you looking from @@DBTS, which is the last used value? The variable name still references the deprecated TIMESTAMP (TS part) data type but it's the ROWVERSION last value.
code :
SELECT @@DBTS
How do I store a rowversion values in a table that already has a rowversion column?

How do I store a rowversion values in a table that already has a rowversion column?


By : user1991144
Date : March 29 2020, 07:55 AM
I hope this helps you .
How do I store a rowversion values in a table that already has a rowversion column?
Need help understand this example about SQL Server rowversion?

Need help understand this example about SQL Server rowversion?


By : Jeron Richard
Date : March 29 2020, 07:55 AM
Any of those help The example in the Books Online is incorrect. I see that was called out in the community comments for the topic.
The code below shows how one might use rowversion to implement optimistic concurrency. This method is often employed when data are presented to the user for update and then modified.
code :
DECLARE
     @MyKey int = 1
    ,@NewMyValue int = 1
    ,@OriginalMyValue int
    ,@OriginalRV rowversion

--get original data, including rowversion
SELECT 
      @OriginalMyValue = myValue
    , @OriginalRV = RV
FROM dbo.MyTest
WHERE myKey = 1;

--check original rowversion value when updating row
UPDATE dbo.MyTest
SET myValue = @NewMyValue
WHERE
    myKey = 1
    AND RV = @OriginalRV;

--optimistic concurrency violation
IF @@ROWCOUNT = 0
    RAISEERROR ('Data was updated or deleted by another user.', 16, 1);
--check original rowversion value when updating row
UPDATE dbo.MyTest
SET myValue = @NewMyValue
WHERE
    myKey = 1
    AND (myValue = @OriginalMyValue
    OR (myValue IS NULL AND @OriginalMyValue IS NULL));
Order Entity Framework query by rowversion property, in store and in memory

Order Entity Framework query by rowversion property, in store and in memory


By : martidb
Date : March 29 2020, 07:55 AM
hop of those help? I ended up implementing the solution jnm2 suggested: writing an ExpressionVisitor to rewrite the query from the predicate-only overload used by normal queries to the overload necessary for in-memory querying. I had to rework the original Microsoft sample code for fake DbSet to allow these visitors to be plugged in and used at the right moment.
A Gist with my code can be found here. If anyone can suggest a more elegant way to apply the visitors, I'm definitely open to suggestions.
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