SSDT Disable an Restore constraints during Publish - sql

Question

I'm adding scripts to an SSDT project to manage the addition/update of data from static data tables. Some of these tables reference each other, so I need to be able to shut down the constraints during the update so that I can let the data sit in an inconsistent state until all the scripts are run (I've got a file for table A, and a separate one for Table B).
Once completed, I need to re-enable all the constraints (and let the system check the data to ensure it's consistent). The caveat, is that for various reasons some of the constraints are currently disabled - and I need to ensure that they restore back to the state they were in before my script.
I can't seem to find a view/table that lists the current status of the FK constraints.
Is there any way to have SSDT publish do this automatically? Or if not, can anyone recommend a good solution for doing this?

Answer 1

In the end, I used a combination of sys.Foreign_Keys and sys.check_constraints, since the disable all command disabled both of them. I'm recording the status of the constraints prior to doing my work, then re-enabling them back to the original state at the end.
If OBJECT_ID('tempdb..#tempConstraints') is not null Drop Table #tempConstraints;
GO
IF (SELECT OBJECT_ID('tempdb..#tmpScriptErrors')) IS NOT NULL DROP TABLE #tmpScriptErrors
GO
CREATE TABLE #tmpScriptErrors (Error int)
GO
Create Table #tempConstraints
(
ConstraintName nVarchar(200),
TableName nVarchar(200),
SchemaName nVarchar(200),
IsNotTrusted bit
);
GO
Begin Tran
Insert into #tempConstraints (ConstraintName, TableName, SchemaName, IsNotTrusted)
Select K.name, object_name(K.parent_object_id), SCHEMA_NAME(T.schema_id), K.Is_Not_Trusted
FROM sys.foreign_keys K
Inner Join sys.tables T on K.parent_object_id = T.object_id
Where is_disabled = 0
Union all
Select K.name, object_name(K.parent_object_id), SCHEMA_NAME(T.schema_id), K.Is_Not_Trusted
from sys.check_constraints K
Inner Join sys.tables T on K.parent_object_id = T.object_id
Where is_disabled = 0
--Disable the Constraints.
Print 'Disabling Constraints'
Exec sp_msforeachtable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL';
----------------------------------------------------------------------------------------
--Do Work Here
----------------------------------------------------------------------------------------
Declare #name nvarchar(200);
Declare #table nvarchar(200);
Declare #schema nvarchar(200);
Declare #script nvarchar(max);
Declare #NotTrusted bit;
Declare constraints_cursor CURSOR FOR
Select ConstraintName, TableName, SchemaName, IsNotTrusted
From #tempConstraints;
Open constraints_cursor;
Fetch Next from constraints_cursor
into #name, #table, #schema, #NotTrusted;
While ##FETCH_STATUS = 0
Begin
--Restore each of the Constraints back to exactly the state they were in prior to disabling.
If #NotTrusted = 1
Set #script = 'ALTER TABLE [' + #schema + '].[' + #table + '] WITH NOCHECK CHECK CONSTRAINT [' + #name + ']';
Else
Set #script = 'ALTER TABLE [' + #schema + '].[' + #table + '] WITH CHECK CHECK CONSTRAINT [' + #name + ']';
exec sp_executesql #script;
If ##ERROR <> 0
Begin
INSERT INTO #tmpScriptErrors (Error)
VALUES (1);
End
Fetch Next from constraints_cursor
into #name, #table, #schema, #NotTrusted;
End
Close constraints_cursor;
Deallocate constraints_cursor;
If exists (Select 'x' from #tmpScriptErrors)
ROLLBACK TRAN;
Else
COMMIT TRAN;
Drop table #tmpScriptErrors
GO
Drop table #tempConstraints
GO