Dynamic, cross database trigger creation - sql

Question

I am trying to dynamically create a number of triggers across two databases but I am having problems with the Create Trigger statement when switching databases
SET #SQL = 'SELECT Name FROM ' + #DB + '.sys.triggers WHERE Name = ' + ''''
+ #Table + '_DELTATrigger' + ''''
EXEC(#SQL)
IF ##RowCount > 0
BEGIN
SET #SQL = 'USE ' + #DB + '; DROP TRIGGER [dbo].[' + #Table + '_DELTATrigger]'
EXEC(#SQL)
END
SET #SQL = 'CREATE TRIGGER [dbo].[' + #Table + '_DELTATrigger]
ON [dbo].[' + #Table + ']
AFTER INSERT, UPDATE
AS
BEGIN
SET NOCOUNT ON
UPDATE [' + #Table + ']
SET [Delta] = 1
FROM inserted
WHERE inserted.[ID] = [' + #Table + '].[ID]
END;'
EXEC (#SQL)
If I run this statement I get the following issue
Error 8197, Level 16, State 4, Procedure tblBuild_DataPlate_DELTATrigger, Line 1
Message: The object 'dbo.tblBuild_DataPlate' does not exist or is
invalid for this operation.
Changing the dynamic create trigger to include the USE statement does not work as the Create Trigger has to be the first statement
SET #SQL = 'USE ' + #DB + '; CREATE TRIGGER [dbo].[' + #Table + '_DELTATrigger]
ON [dbo].[' + #Table + ']
AFTER INSERT, UPDATE
AS
BEGIN
SET NOCOUNT ON
UPDATE [' + #Table + ']
SET [Delta] = 1
FROM inserted
WHERE inserted.[ID] = [' + #Table + '].[ID]
END;'
EXEC (#SQL)
Error 111, Level 15, State 1, Procedure -,
Line 1, Message: 'CREATE TRIGGER' must be the first
statement in a query batch.
You can not fully qualify the object with the database in this case as you get the following error
Error 166, Level 15, State 1, Procedure -, Line 1,
Message: 'CREATE/ALTER TRIGGER' does not allow
specifying the database name as a prefix to the object name.
Is there a dynamic way around this?

Answer 1

This code below will run the sp_executesql on the selected database (#DB), so with this, you can create the trigger on the rigth place:
SET #SQL = 'EXEC ' + #DB + '..sp_executesql N''
CREATE TRIGGER [dbo].[' + #Table + '_DELTATrigger]
ON [dbo].[' + #Table + ']
AFTER INSERT, UPDATE
AS
BEGIN
SET NOCOUNT ON
END;'''
EXEC (#SQL)