Reverse engineering does not mark rowversion/timestamp columns as concurrency tokens


Please add a feature to automatically set ConcurrencyMode=Fixed.

EF defaults to no concurrency control (last write wins) which allows lost updates.
Enforcing optimistic concurrency checks can explicitly be configured by setting ConcurrencyMode=Fixed on a RowVersion column.

Having to do this manually when recreating an EF model from a database we risk forgetting it and running without concurrency control. Almost every DB application uses concurrency control and I expect there to be a way to automatically make the setting and not have to manually set it for each table.
Closed Dec 12, 2016 at 9:30 PM by RoMiller
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RoMiller wrote Oct 16, 2012 at 5:57 PM

We agree that the designer should set ConcurrencyMode=Fixed on rowversion columns when creating a model from the database. We are marking this to be fixed in the EF6 release.

pmeinl wrote Oct 24, 2012 at 9:58 AM

Please consider not only tying to the SQL Server RowVersion datatype.

Using a naming convention like column name = "RowVer" would be more flexible and especially enable this feature for other databases like Oracle too.

With ADO.NET it is always a nuisance for us that only SQLCommandBuilder implements the ConflictOption CompareRowVersion and Oracle CommandBuilder does not, while this would have been so easy to provide.

RoMiller wrote Jan 16, 2013 at 8:27 PM

We are only taking minimal changes to the designer in EF6 because we are still converting the code base to open source. We'll consider this bug for the next release.

LSx123xyz wrote Feb 25, 2013 at 10:16 AM


Looking for the same.

A prefix for the column name, or an SQL-Transact column property, that can be set in SQL Server Diagram designer.

Best regards

Luís Silva

jfbosch wrote Aug 19, 2013 at 10:38 PM

BriceLambson wrote Dec 27, 2013 at 9:05 PM

The Reverse Engineer Code First feature of One EF will do this automatically.

wezeku wrote Apr 28, 2014 at 4:14 PM

The workaround in jfbosch's link is fragile. It treats EDMX XML as 'dumb' text, not as XML.

I wrote a tiny utility to automate the ConcurrencyMode setting. You can either use it to set the mode for certain types (timestamp/rowversion) or for column names matching certain regex patterns.