Sql server T-SQL合并-找出它执行的操作
我需要知道MERGE语句是否执行了INSERT。在我的场景中,插入是0行或1行 测试代码:Sql server T-SQL合并-找出它执行的操作,sql-server,tsql,sql-server-2008,Sql Server,Tsql,Sql Server 2008,我需要知道MERGE语句是否执行了INSERT。在我的场景中,插入是0行或1行 测试代码: DECLARE @t table (C1 int, C2 int) DECLARE @C1 INT, @C2 INT set @c1 = 1 set @c2 = 1 MERGE @t as tgt USING (SELECT @C1, @C2) AS src (C1, C2) ON (tgt.C1 = src.C1) WHEN MATCHED AND
DECLARE @t table (C1 int, C2 int)
DECLARE @C1 INT, @C2 INT
set @c1 = 1
set @c2 = 1
MERGE @t as tgt
USING (SELECT @C1, @C2) AS src (C1, C2)
ON (tgt.C1 = src.C1)
WHEN MATCHED AND tgt.C2 != src.C2 THEN
UPDATE SET tgt.C2 = src.C2
WHEN NOT MATCHED BY TARGET THEN
INSERT VALUES (src.C1, src. C2)
OUTPUT deleted.*, $action, inserted.*;
SELECT inserted.*
最后一行不编译(与触发器不同,没有范围)。我无法访问@action或输出。实际上,我不想要任何输出元数据
如何执行此操作?我认为获取插入行的唯一方法是在目标表上使用插入后
触发器
要将合并插入与其他插入区分开来,可以使用第三个表,其中插入了MERGE。在该表上定义插入后的触发器,以处理合并行并在目标表中插入行。您可以输出到表变量中,然后从中检索。试试这个:
DECLARE @t table (C1 int, C2 int)
DECLARE @C1 INT, @C2 INT
DECLARE @Output TABLE (DeletedC1 INT, DeletedC2 INT, ActionType VARCHAR(20), InsertedC1 INT, InsertedC2 INT)
set @c1 = 1
set @c2 = 1
MERGE @t as tgt
USING (SELECT @C1, @C2) AS src (C1, C2)
ON (tgt.C1 = src.C1)
WHEN MATCHED AND tgt.C2 != src.C2 THEN
UPDATE SET tgt.C2 = src.C2
WHEN NOT MATCHED BY TARGET THEN
INSERT VALUES (src.C1, src. C2)
OUTPUT deleted.*, $action, inserted.* INTO @Output;
SELECT * FROM @Output WHERE ActionType = 'INSERT'
+1那就行了。显然,我试图将所有代码保存在一个存储过程中,但我认为迁移该部分不会有什么害处。