I have an audit table
EpisodesHistory. One of the fields that gets copied is
eDescription. I expect
eDescription to be regularly be a couple kilobytes in length.
For database space and transmission to client applications, I wanted to do something where if, upon recording the change,
eDescription is identical to a previous iteration, it records that value.
Let’s say I have this
HistoryID(PK) | EpisodeID | eDescription | ... other fields 1 10 Watch my dog do a trick 2 10 Watch my cat sleep 3 11 Watch my dog do a trick
In the case of row 3, it was inserted because the
episodeID is different.
However, if I then added:
HistoryID(PK) | EpisodeID | eDescription | ... other fields` 4 10 Watch my dog do a trick`
I wanted to auto-update an additional field
EpisodesHistory.eDescRef to the ID of the row containing the same description.
1 in this case because 1 is the first row to have this field.
It took me a few attempts to get something working so I want to make sure that this is the optimum method as this will be one of the busier triggers in my database.
USE [Shows] GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO ALTER TRIGGER [dbo].[tr-EpisodesHistory] on [dbo].[Episodes] FOR UPDATE AS IF TRIGGER_NESTLEVEL(OBJECT_ID('dbo.EpisodesHistory')) > 1 BEGIN RETURN; END; DECLARE @CMP INTEGER DECLARE @NEWID INTEGER = 0 IF NOT UPDATE(eOwner) OR NOT EXISTS((SELECT *, eActor = 0 FROM Inserted except SELECT *, eActor = 0 FROM Deleted)) --- the second condition was moved to the code-side query to prevent firing of the trigger BEGIN -- Weed out updates to episode scoring, or where nothing that matters in the row was changed (eActor doesn't matter) -- eVersion is incremented code-side, so this has to be undone. -- Could be incremented here instead, but thats yet another query for successful updates UPDATE Episodes SET eVersion = eVersion - 1 WHERE EpisodeID = (SELECT EpisodeID From Inserted) return; END SET @CMP = (Select Top 1 Past.HISTORYID FROM DELETED Curr, EpisodesHistory Past where Curr.EpisodeID = Past.EpisodeID and Curr.eOwner = Past.eOwner and Curr.eDescription = Past.eDescription) SET @CMP = ISNULL(@CMP, 0) INSERT into EpisodesHistory SELECT *, eDescRef = @CMP, hWhen = getDate() from deleted; SET @NEWID = SCOPE_IDENTITY() IF @CMP > 0 BEGIN UPDATE EpisodesHistory SET eDescRef = @CMP, eDescription = '' WHERE HistoryID = @NEWID END
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