Question

I wish to make a trigger but i’m not sure how to grab the data for whatever caused the trigger.

I have a simlpe table.

FooId INT PK NOT NULL IDENTITY
Name VARCHAR(100) NOT NULL

I wish to have a trigger so that when an UPDATE, INSERT or DELETE occurs, i then do the following.

Pseduocode

IF INSERT
    Print 'Insert' & Name
ELSE IF UPDATE
    Print 'Update' & FooId & Name
ELSE IF DELETE
    Print 'Delete' & FooId & Name

Now, I know how to make a trigger for a table.
What i don’t know how to do is figure out the values based on what the trigger type is.

Can anyone help?

Edit: Not sure if it helps, but db is Sql Server 2008

Answer 1

the pseudo table “inserted” contains the new data, and “deleted” table contains the old data.

You can do something like

create trigger mytrigger on mytable for insert, update, delete
as
    if ( select count(*) from inserted ) > 0
        -- insert or update
        select FooId, Name from inserted
    else
        -- delete
        select FooId, Name from deleted

To clarify all the comments made by others, on an insert, the inserted table contains data and deleted is empty. On a delete, the situation is reversed. On an update, deleted and inserted contain the “before” and “after” copy of any updated rows.