Come suggerito da Martin, devi abilitare IDENTITY_INSERT in modo che tu possa spingere i tuoi valori di identità. Potrebbe anche essere necessario acquisire un blocco tabella per garantire che Max( Id ) restituisca il valore corretto.
If object_id('tempdb..#TestData') is not null
Drop Table #TestData
GO
Create Table #TestData
(
Id int not null identity(1,1) Primary Key
, ParentId int not null
, Name varchar(50) not null
)
GO
Set Identity_Insert #TestData On
GO
Insert #TestData( Id, ParentId, Name )
Values( 1,0,'Food' )
, ( 2,1,'Taste' )
, ( 3,1,'Price' )
, ( 4,2,'Taste Requirement' );
With Data As
(
Select Cast(MaxId.Id + 1 As int) As Id
, T.ParentId
, 'Copy Of ' + T.name As Name
, T.Id As OldId
, 0 As OldParentId
From #TestData As T
Cross Join( Select Max( id ) As Id From #TestData ) As MaxId
Where T.Name = 'Food'
Union All
Select Cast(Parent.id + Row_Number() Over( Order By Child.Id ) + 1 As int)
, Parent.Id
, 'Copy of ' + Child.Name
, Child.Id
, Child.ParentId
From Data As Parent
Join #TestData As Child
On Child.ParentId = Parent.OldId
)
Insert #TestData( Id, ParentId, Name )
Select Id, ParentId, Name
From Data
GO
Set Identity_Insert #TestData Off
GO
Risultati
id | parentid | name -- | -------- | ----------------- 1 | 0 | Food 2 | 1 | Taste 3 | 1 | Price 4 | 2 | Taste Requirement 5 | 0 | Copy Of Food 7 | 5 | Copy of Taste 8 | 5 | Copy of Price 9 | 7 | Copy of Taste Requirement
