Question

I have database with around 100 tables and I need to implement log of actions like insert, update and delete on all those tables.

I decide to use a trigger as logging mechanism, and problem I have is to dynamically get values of columns that forms primary keys (some primary key are identity, and some are composite keys made of two columns).

I know this can be done via dynamic SQL, but I am asking myself, and now even you, is it possible to somehow avoid dynamic SQL in trigger definition.

So, my log table looks like:

CREATE TABLE [dbo].[HistoryTable](
    [HistoryTable] [int] IDENTITY(1,1) NOT NULL,
    [PKValues] [varchar](50) NOT NULL,
    [AllValues] [nvarchar](500) NOT NULL,
)

So, if table consists composite primary key, then values of those columns affected by insert, update or delete action must be one value with values separated with comma, or semi-colon:

PKValues    AllValues

1;1         <row columnId1=1 columnId2=1 Title="test" />
1;2         <row columnId1=1 columnId2=2 Title="test2" />
1           <row columnId1=1 Title="test3" />
...

First two rows in example are from table with composite primary key, and third row is from table with single identity column as primary key.

Dynamically retrieve composite primary key values in trigger

0 个答案: