Log table using trigger - sql

Question

I need to create trigger which insert into dbo.Log table values:
- in action_type : how many records was UPDATED ,DELETED or INSERTED
- in datetime_of_action ofcourse timestamp of action
For now I have this:
DROP TABLE dbo.Log
CREATE TABLE dbo.Log (
logid INT NOT NULL IDENTITY,
action_type NVARCHAR(50) NOT NULL,
datetime_of_action DATETIME NOT NULL,
CONSTRAINT PK_Log PRIMARY KEY(logid));
CREATE TRIGGER trig2
ON Sales.Customers
FOR UPDATE , DELETE, INSERT
AS
BEGIN
......................
END
SELECT * FROM dbo.Log
And this is a script of Sales.Customers table:
CREATE TABLE [Sales].[Customers](
[custid] [int] IDENTITY(1,1) NOT NULL,
[companyname] [nvarchar](40) NOT NULL,
[contactname] [nvarchar](30) NOT NULL,
[contacttitle] [nvarchar](30) NOT NULL,
[address] [nvarchar](60) NOT NULL,
[city] [nvarchar](15) NOT NULL,
[region] [nvarchar](15) NULL,
[postalcode] [nvarchar](10) NULL,
[country] [nvarchar](15) NOT NULL,
[phone] [nvarchar](24) NOT NULL,
[fax] [nvarchar](24) NULL,
CONSTRAINT [PK_Customers] PRIMARY KEY CLUSTERED
(
[custid] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
If anyone knows how do this I am open on your advice.

Answer 1

Use this query:
CREATE TRIGGER trig2
ON Sales.Customers
AFTER UPDATE , DELETE, INSERT
AS
BEGIN
IF EXISTS (select * From inserted)
BEGIN
IF EXISTS (select * From deleted)
BEGIN
INSERT INTO dbo.Log (action_typ, datetime_of_action )
VALUES(CAST(SELECT COUNT(*) FROM deleted) as VARCHAR(50) + ' records have been updated',GETDATE())
END
ELSE
BEGIN
INSERT INTO dbo.Log (action_typ, TOTAL, datetime_of_action )
VALUES(CAST(SELECT COUNT(*) FROM inserted) as VARCHAR(50) + ' records have been iniserted',GETDATE())
END
ELSE
BEGIN
INSERT INTO dbo.Log (action_typ, TOTAL, datetime_of_action )
VALUES(CAST(SELECT COUNT(*) FROM deleted) as VARCHAR(50) + ' records have been deleted',GETDATE())
END
END

Answer 2

CREATE TRIGGER trig2
ON Sales.Customers
FOR UPDATE , DELETE, INSERT
AS
BEGIN
SET NOCOUNT ON;
-- First determine the action
DECLARE #Action NVARCHAR(50);
SET #Action = (CASE WHEN EXISTS(SELECT * FROM INSERTED) AND EXISTS(SELECT * FROM DELETED)
THEN N'Update: ' + CAST( (SELECT COUNT(*) FROM INSERTED) AS NVARCHAR(10))
WHEN EXISTS(SELECT * FROM INSERTED) AND NOT EXISTS(SELECT * FROM DELETED)
THEN N'Insert: ' + CAST( (SELECT COUNT(*) FROM INSERTED) AS NVARCHAR(10))
WHEN EXISTS(SELECT * FROM DELETED) AND NOT EXISTS(SELECT * FROM INSERTED)
THEN N'Delete: ' + CAST( (SELECT COUNT(*) FROM DELETED) AS NVARCHAR(10))
ELSE NULL -- Skip. It may have been a "failed delete".
END)
INSERT INTO dbo.[Log] (action_type, datetime_of_action)
VALUES (#Action , GETDATE());
END