SQL更新(如果存在且较旧),否则插入
我在SQL 2008中得到了一个如下所示的表:SQL更新(如果存在且较旧),否则插入,sql,sql-server-2008,Sql,Sql Server 2008,我在SQL 2008中得到了一个如下所示的表: DECLARE @DataTable TABLE ( Name varchar(10), [TimeStamp] DateTime, Event varchar(10), Data varchar(10) ) INSERT INTO @DataTable VALUES ('TEST01', '2012/03/06 10:00', 'EventA', 1), ('TEST01', '2012/03/
DECLARE @DataTable TABLE
(
Name varchar(10),
[TimeStamp] DateTime,
Event varchar(10),
Data varchar(10)
)
INSERT INTO @DataTable
VALUES ('TEST01', '2012/03/06 10:00', 'EventA', 1),
('TEST01', '2012/03/06 10:01', 'EventB', 2),
('TEST01', '2012/03/06 11:00', 'EventC', 0)
IF EXISTS
(
SELECT
NULL
FROM
@DataTable AS DataTable
WHERE
DataTable.Event=@NewEvent
AND DataTable.Name=@NewName
)
BEGIN
IF EXISTS
(
SELECT
NULL
FROM
@DataTable AS DataTable
WHERE
DataTable.Event=@NewEvent
AND DataTable.Name=@NewName
AND DataTable.TimeStamp<@NewTimeStamp
)
BEGIN
UPDATE @DataTable
SET TimeStamp=@NewTimeStamp,
Data=@NewData
WHERE
Event=@NewEvent
AND Name=@NewName
AND TimeStamp<@NewTimeStamp
END
END
ELSE
BEGIN
INSERT INTO @DataTable(Data,Event,Name,TimeStamp)
VALUES(@NewData,@NewEvent,@NewName,@NewTimeStamp)
END
如何在SQL中执行以下操作:
If DataTable contains row where Name = @NewName and Event = @NewEvent Then
If TimeStamp of the above row < @NewTimeStamp
Update that row with new TimeStamp and Data
EndIf
Else
Insert row into table
EndIf
也许是这样的:
DECLARE @DataTable TABLE
(
Name varchar(10),
[TimeStamp] DateTime,
Event varchar(10),
Data varchar(10)
)
INSERT INTO @DataTable
VALUES ('TEST01', '2012/03/06 10:00', 'EventA', 1),
('TEST01', '2012/03/06 10:01', 'EventB', 2),
('TEST01', '2012/03/06 11:00', 'EventC', 0)
IF EXISTS
(
SELECT
NULL
FROM
@DataTable AS DataTable
WHERE
DataTable.Event=@NewEvent
AND DataTable.Name=@NewName
)
BEGIN
IF EXISTS
(
SELECT
NULL
FROM
@DataTable AS DataTable
WHERE
DataTable.Event=@NewEvent
AND DataTable.Name=@NewName
AND DataTable.TimeStamp<@NewTimeStamp
)
BEGIN
UPDATE @DataTable
SET TimeStamp=@NewTimeStamp,
Data=@NewData
WHERE
Event=@NewEvent
AND Name=@NewName
AND TimeStamp<@NewTimeStamp
END
END
ELSE
BEGIN
INSERT INTO @DataTable(Data,Event,Name,TimeStamp)
VALUES(@NewData,@NewEvent,@NewName,@NewTimeStamp)
END
如果存在
(
挑选
无效的
从…起
@DataTable作为DataTable
哪里
DataTable.Event=@NewEvent
和DataTable.Name=@NewName
)
开始
如果存在
(
挑选
无效的
从…起
@DataTable作为DataTable
哪里
DataTable.Event=@NewEvent
和DataTable.Name=@NewName
和DataTable.TimeStamp可能是这样的:
DECLARE @DataTable TABLE
(
Name varchar(10),
[TimeStamp] DateTime,
Event varchar(10),
Data varchar(10)
)
INSERT INTO @DataTable
VALUES ('TEST01', '2012/03/06 10:00', 'EventA', 1),
('TEST01', '2012/03/06 10:01', 'EventB', 2),
('TEST01', '2012/03/06 11:00', 'EventC', 0)
IF EXISTS
(
SELECT
NULL
FROM
@DataTable AS DataTable
WHERE
DataTable.Event=@NewEvent
AND DataTable.Name=@NewName
)
BEGIN
IF EXISTS
(
SELECT
NULL
FROM
@DataTable AS DataTable
WHERE
DataTable.Event=@NewEvent
AND DataTable.Name=@NewName
AND DataTable.TimeStamp<@NewTimeStamp
)
BEGIN
UPDATE @DataTable
SET TimeStamp=@NewTimeStamp,
Data=@NewData
WHERE
Event=@NewEvent
AND Name=@NewName
AND TimeStamp<@NewTimeStamp
END
END
ELSE
BEGIN
INSERT INTO @DataTable(Data,Event,Name,TimeStamp)
VALUES(@NewData,@NewEvent,@NewName,@NewTimeStamp)
END
如果存在
(
挑选
无效的
从…起
@DataTable作为DataTable
哪里
DataTable.Event=@NewEvent
和DataTable.Name=@NewName
)
开始
如果存在
(
挑选
无效的
从…起
@DataTable作为DataTable
哪里
DataTable.Event=@NewEvent
和DataTable.Name=@NewName
和DataTable.TimeStamp您可以简单地检查是否存在带有参数的行
IF EXISTS (SELECT * FROM @DataTable WHERE Name = @newName AND Event = @newEvent)
BEGIN
IF EXISTS (SELECT * FROM @DataTable WHERE Name = @newName AND Event = @newEvent AND TimeStamp < @newTimeStamp)
--Update
UPDATE @DataTable
SET TimeStamp=@NewTimeStamp,
Data=@NewData
WHERE
Event=@NewEvent
AND Name=@NewName
END
ELSE
BEGIN
--insert
END
如果存在(从@DataTable中选择*,其中Name=@newName和Event=@newEvent)
开始
如果存在(从@DataTable中选择*,其中Name=@newName和Event=@newEvent和TimeStamp<@newTimeStamp)
--更新
更新@DataTable
设置时间戳=@NewTimeStamp,
Data=@NewData
哪里
Event=@NewEvent
和Name=@NewName
结束
其他的
开始
--插入
结束
您只需检查参数中是否存在行
IF EXISTS (SELECT * FROM @DataTable WHERE Name = @newName AND Event = @newEvent)
BEGIN
IF EXISTS (SELECT * FROM @DataTable WHERE Name = @newName AND Event = @newEvent AND TimeStamp < @newTimeStamp)
--Update
UPDATE @DataTable
SET TimeStamp=@NewTimeStamp,
Data=@NewData
WHERE
Event=@NewEvent
AND Name=@NewName
END
ELSE
BEGIN
--insert
END
如果存在(从@DataTable中选择*,其中Name=@newName和Event=@newEvent)
开始
如果存在(从@DataTable中选择*,其中Name=@newName和Event=@newEvent和TimeStamp<@newTimeStamp)
--更新
更新@DataTable
设置时间戳=@NewTimeStamp,
Data=@NewData
哪里
Event=@NewEvent
和Name=@NewName
结束
其他的
开始
--插入
结束
merge@DataTable作为dt
使用(选择@data作为数据,@event作为事件,@name作为名称,@timestamp作为时间戳)源
在dt.name=source.name和dt.event=source.event上
当匹配和dt.timestamp source.timestamp时,则
插入(数据、事件、名称、时间戳)
值(数据、事件、名称、时间戳)
当不匹配时
插入(数据、事件、名称、时间戳)
值(数据、事件、名称、时间戳)
merge@DataTable作为dt
使用(选择@data作为数据,@event作为事件,@name作为名称,@timestamp作为时间戳)源
在dt.name=source.name和dt.event=source.event上
当匹配和dt.timestamp source.timestamp时,则
插入(数据、事件、名称、时间戳)
值(数据、事件、名称、时间戳)
当不匹配时
插入(数据、事件、名称、时间戳)
值(数据、事件、名称、时间戳)
但是,如果数据比现有数据旧,那么不会添加新行吗?但是如果数据比现有数据旧,那么不会添加新行吗?太棒了-我想你只需要去掉第二个“匹配时”块。太棒了-我想你只需要去掉第二个“匹配时”块。