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Asked: 2026-05-30T06:00:28+00:00

I am using IDENTITY columns in my SQL Server tables. I have a unit

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I am using IDENTITY columns in my SQL Server tables.

I have a unit test where I delete a data record with a certain id.

When I insert the testdata I get this exception:

Cannot insert explicit value for identity column in table ‘MyTablename’ when IDENTITY_INSERT is set to OFF

Then I do a quick test in my management studio:

SET IDENTITY_INSERT MyTablename ON

It says Command(s) completed successfully.

I rerun the unit test but still get the same error.

How do I go about that in general? I want that my unit testing database with all tables should allow me to insert a value manually for an identity column.

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1 Answer

  1. Editorial Team

    SET IDENTITY_INSERT is session-specific. You can’t set it to true in SSMS and then go run a unit test in some other rig. The SET command needs to be part of the unit test code.

    Also, you can only set this setting to one table at a time, so it doesn’t seem like your unit test will work very well unless you set each table as you need it.

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