Stored Procedure that creates a trigger on new tables

Question

I am trying to create a stored procedure that creates a trigger on new tables whenever the table is created.  The procedure should receive the new project table's name, and then create a dml trigger on that procedure.  When the procedure
is run, I get an error "Incorrect syntax near keyword 'TRIGGER.'"  This is how my Stored Procedure looks in SQL Management Studio.  Any suggestions?
USE [RIDB_DynamicDesign]
GO
/****** Object: StoredProcedure [dbo].[sp_CreateTriggerMarkLatest] Script Date: 11/08/2014 16:43:20 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
ALTER PROCEDURE [dbo].[sp_CreateTriggerMarkLatest] @ProjectTable nvarchar(128), @ItExists int OUTPUT
AS
DECLARE @SQL nvarchar(4000)
DECLARE @MarkLatest nvarchar(30)
DECLARE @LatTrue bit
DECLARE @LatFalse bit
SET @LatTrue = 'True'
SET @LatFalse = 'False'
SET @SQL = 'CREATE TRIGGER tr_MarkLatest ON ' + @ProjectTable + ' AFTER INSERT
AS
UPDATE ' + @ProjectTable + ' SET Latest = @LatFalse
UPDATE ' + @ProjectTable + ' SET Latest = @LatTrue WHERE
ID IN (SELECT ID FROM ' + @ProjectTable + ' p WHERE
NOT EXISTS (SELECT 1 FROM ' + @ProjectTable + ' WHERE
Name = p.Name AND Vers = p.Vers
AND Date > p.Date))'
EXEC sp_executesql @SQL, N'@ProjectTable nvarchar(128), @LatTrue bit, @LatFalse bit',
@ProjectTable, @LatTrue, @LatFalse
Gina

Answer 1

First you have to debug the dynamic SQL string with a PRINT statement. I see some problems:
CREATE PROCEDURE [dbo].[uspCreateTriggerMarkLatest] @ProjectTable nvarchar(128), @ItExists int OUTPUT
AS BEGIN
DECLARE @SQL nvarchar(4000)
DECLARE @MarkLatest nvarchar(30)
DECLARE @LatTrue bit
DECLARE @LatFalse bit
SET @LatTrue = 'True'
SET @LatFalse = 'False'
SET @SQL = 'CREATE TRIGGER tr_MarkLatest ON ' + @ProjectTable + ' AFTER INSERT
AS
UPDATE ' + @ProjectTable + ' SET Latest = @LatFalse
UPDATE ' + @ProjectTable + ' SET Latest = @LatTrue WHERE
ID IN (SELECT ID FROM ' + @ProjectTable + ' p WHERE
NOT EXISTS (SELECT 1 FROM ' + @ProjectTable + ' WHERE
Name = p.Name AND Vers = p.Vers
AND Date > p.Date))'
PRINT @SQL;
-- EXEC sp_executesql @SQL, N'@ProjectTable nvarchar(128), @LatTrue bit, @LatFalse bit', @ProjectTable, @LatTrue, @LatFalse
END
GO
DECLARE @ItExists int, @ProjectTable nvarchar(128) = N'TestTrigger';
EXEC [dbo].[uspCreateTriggerMarkLatest] @ProjectTable, @ItExists OUTPUT
CREATE TRIGGER tr_MarkLatest ON TestTrigger AFTER INSERT
AS
UPDATE TestTrigger SET Latest = @LatFalse
UPDATE TestTrigger SET Latest = @LatTrue WHERE
ID IN (SELECT ID FROM TestTrigger p WHERE
NOT EXISTS (SELECT 1 FROM TestTrigger WHERE
Name = p.Name AND Vers = p.Vers
AND Date > p.Date))
Kalman Toth Database & OLAP Architect
SQL Server 2014 Database Design
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