USE
AdventureWorks2008R2;
GO
CREATE
PROCEDURE
dbo.InsertUnitMeasure
@UnitMeasureCode
nchar
(
3
),
@Name
nvarchar
(
25
)
AS
BEGIN
SET
NOCOUNT
ON
;
--
Update the row if it exists.
UPDATE
Production.UnitMeasure
SET
Name
=
@Name
WHERE
UnitMeasureCode
=
@UnitMeasureCode
--
Insert the row if the UPDATE statement failed.
IF
(
@@ROWCOUNT
=
0
)
BEGIN
INSERT
INTO
Production.UnitMeasure (UnitMeasureCode, Name)
VALUES
(
@UnitMeasureCode
,
@Name
)
END
END
;
GO
--
Test the procedure and return the results.
EXEC
InsertUnitMeasure
@UnitMeasureCode
=
'
ABC
'
,
@Name
=
'
Test Value
'
;
SELECT
UnitMeasureCode, Name
FROM
Production.UnitMeasure
WHERE
UnitMeasureCode
=
'
ABC
'
;
GO
--
Rewrite the procedure to perform the same operations using the MERGE statement.
--
Create a temporary table to hold the updated or inserted values from the OUTPUT clause.
CREATE
TABLE
#MyTempTable
(ExistingCode
nchar
(
3
),
ExistingName
nvarchar
(
50
),
ExistingDate
datetime
,
ActionTaken
nvarchar
(
10
),
NewCode
nchar
(
3
),
NewName
nvarchar
(
50
),
NewDate
datetime
);
GO
ALTER
PROCEDURE
dbo.InsertUnitMeasure
@UnitMeasureCode
nchar
(
3
),
@Name
nvarchar
(
25
)
AS
BEGIN
SET
NOCOUNT
ON
;
MERGE Production.UnitMeasure
AS
target
USING (
SELECT
@UnitMeasureCode
,
@Name
)
AS
source (UnitMeasureCode, Name)
ON
(target.UnitMeasureCode
=
source.UnitMeasureCode)
WHEN
MATCHED
THEN
UPDATE
SET
Name
=
source.Name
WHEN
NOT
MATCHED
THEN
INSERT
(UnitMeasureCode, Name)
VALUES
(source.UnitMeasureCode, source.Name)
OUTPUT deleted.
*
, $action, inserted.
*
INTO
#MyTempTable;
END
;
GO
--
Test the procedure and return the results.
EXEC
InsertUnitMeasure
@UnitMeasureCode
=
'
ABC
'
,
@Name
=
'
New Test Value
'
;
EXEC
InsertUnitMeasure
@UnitMeasureCode
=
'
XYZ
'
,
@Name
=
'
Test Value
'
;
EXEC
InsertUnitMeasure
@UnitMeasureCode
=
'
ABC
'
,
@Name
=
'
Another Test Value
'
;
SELECT
*
FROM
#MyTempTable;
--
Cleanup
DELETE
FROM
Production.UnitMeasure
WHERE
UnitMeasureCode
IN
(
'
ABC
'
,
'
XYZ
'
);
DROP
TABLE
#MyTempTable;
GO
