Question

Is it possible to delete all data in the database using NHibernate. I want to do that before starting each unit test. Currently I drop my database and create it again but this is not acceptable solution for me.

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Ok, here are the results. I am testing this on a database (Postgre). I will test CreateSchema(1), DanP solution(2) and apollodude217 solution(3). I run the tests 5 times with each method and take the average time.

Round 1 – 10 tests
(1) – ~26 sec
(2) – 9,0 sec
(3) – 9,3 sec

Round 2 – 100 tests
(1) – Come on, I will not do that on my machine
(2) – 12,6 sec
(3) – 18,6 sec

I think that it is not necessary to test with more tests.

Answer 1

Personally, I use a stored procedure to do this, but it may be possible with Executable HQL (see this post for more details: http://fabiomaulo.blogspot.com/2009/05/nh21-executable-hql.html )

Something along the lines of session.Delete(“from object”);