[英]Using MERGE INTO with Scope_IDENTITY
When Merge into
does an insert
with the following statement, Scope_Identity
returns the correct surrogate key information.当
Merge into
使用以下语句进行insert
时, Scope_Identity
返回正确的代理键信息。 However when an update
is performed both Scope_Identity
and @@Identity
return the next available surrogate key.但是,当执行
update
时, Scope_Identity
和@@Identity
都会返回下一个可用的代理键。 And when I added the output
, I get a null on both update
and insert
.当我添加
output
时,我在update
和insert
上都得到了 null 。
How do I return the surrogate key on both the update
and the insert
?如何在
update
和insert
上返回代理键?
DECLARE @Surrogate_KEY bigint
MERGE INTO [dbo].[MyTable] ChangeSet
USING (SELECT @NaturalKey1 AS NaturalKey1,
@NaturalKey2 AS NaturalKey2,
@NaturalKey3 AS NaturalKey3,
@Surrogate_KEY AS Surrogate_KEY) CurrentSet
ON ChangeSet.NaturalKey1 = CurrentSet.NaturalKey1 AND
ChangeSet.NaturalKey2 = CurrentSet.NaturalKey2 AND
ChangeSet.NaturalKey3 = CurrentSet.NaturalKey3
WHEN MATCHED THEN
UPDATE SET blah, blah, blah
WHEN NOT MATCHED
THEN INSERT VALUES
(
blah, blah, blah
)
output CurrentSet.*, @Surrogate_KEY ;
print @Surrogate_KEY
print @@IDENTITY
print SCOPE_IDENTITY()
Use the inserted
pseudo table in your OUTPUT clause :在OUTPUT 子句中使用
inserted
的伪表:
DECLARE @Surrogate_KEY bigint
MERGE INTO [dbo].[MyTable] ChangeSet
USING (SELECT @NaturalKey1 AS NaturalKey1,
@NaturalKey2 AS NaturalKey2,
@NaturalKey3 AS NaturalKey3,
@Surrogate_KEY AS Surrogate_KEY) CurrentSet
ON ChangeSet.NaturalKey1 = CurrentSet.NaturalKey1 AND
ChangeSet.NaturalKey2 = CurrentSet.NaturalKey2 AND
ChangeSet.NaturalKey3 = CurrentSet.NaturalKey3
WHEN MATCHED THEN
UPDATE SET blah, blah, blah
WHEN NOT MATCHED
THEN INSERT VALUES
(
blah, blah, blah
)
output inserted.* ;
This returns whatever the values are in the table (for the affected rows) at the end of the statement.这将返回语句末尾表中的任何值(对于受影响的行)。
DECLARE @Id ...
--
MERGE
dbo.Table AS Tgt
USING
(
SELECT
<Keys>
) AS Src
ON Src.<Keys> = Tgt.<Keys>
WHEN MATCHED THEN
UPDATE SET
<...>
,@Id = Tgt.Id
WHEN NOT MATCHED THEN
INSERT
(
...
)
VALUES
(
...
)
;--
RETURN/SET/PRINT ISNULL(@Id, SCOPE_IDENTITY())
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