I’m facing an issue with SQL Server Replication and INSTEAD OF UPDATE trigger.
I have a table and a trigger that looks like this :
CREATE TABLE [dbo].[TableA] ( [Identifier] BIGINT IDENTITY(1,1) NOT NULL, [Name] NVARCHAR(50) NOT NULL, [Description] NVARCHAR(4000) NULL, CONSTRAINT [PK_TableA] PRIMARY KEY CLUSTERED ([Identifier] ASC) ) GO CREATE TRIGGER [dbo].[TableAInsteadOfUpdate] ON [dbo].[TableA] INSTEAD OF UPDATE AS BEGIN --Obviously some code here UPDATE dbo.TableA SET Name = t0.Name ,Description = t0.Description FROM inserted AS t0 WHERE dbo.TableA.Identifier = t0.Identifier --And here to... END
The UPDATE inside the trigger update all columns, disregarding of the real updated columns in the original UPDATE query :
--This update will lead to a final UPDATE instruction on all columns UPDATE TableA SET Name = 'test' WHERE Identifier = 2
The column-tracking option of replication article is not working because SQL Server replication internaly use COLUMNS_UPDATED() to flag updated columns in a trigger.
One solution would be to execute individual UPDATE for each column separatly like that :
CREATE TRIGGER [dbo].[TableAInsteadOfUpdate] ON [dbo].[TableA] INSTEAD OF UPDATE AS BEGIN --Obviously some code here IF UPDATE (Name) BEGIN UPDATE TableA SET Name = t0.Name FROM inserted AS t0 WHERE TableA.Identifier = t0.Identifier END IF UPDATE (Description) BEGIN UPDATE TableA SET Description = t0.Description FROM inserted AS t0 WHERE TableA.Identifier = t0.Identifier END --And here to... END
This is obviously not a good things for performance but at least this should work. Another way would be to modify replication trigger to implement a real column data comparision logic but i’m not sure that’s a good idea… Does someone have a better solution ?
By advance thank you for your answer and have a nice day!
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