How SP can get yesterday data and insert into table with current date?

Hi

There is a exchanges table, which need to keep updated exchange rates everyday. If today exchange rates do not change, then just copy yesterday rates and insert to the table.

There are over 20 rates for a single day.

I wrote the following SP.

1)  How to select yesterday data? getDate()-1 ?
2) How to insert all yesterday data to today data?


ALTER PROCEDURE [dbo].[SP_Update_Exchanges] 
@id int
AS
BEGIN
Declare @currency int
Declare @referencerate decimal(18,6)
Declare @buy decimal(18,6)
Declare @sell decimal(18,6)
	SET NOCOUNT ON;
	SELECT @currency=currency, @referencerate=referencerate, @buy=buy, @sell=sell from exchanges where systemdate = getDate()-1
BEGIN
insert into exchanges (currency,referencerate,buy,sell,systemdate) 
values (@currency,@referencerate,@buy,@sell,getDate())
END
END

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techquesAsked:
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mfhorizonConnect With a Mentor Commented:
You should write the procedure similar to this... and call the procedure like below:
SP_Update_Exchanges '02-APR-2009',22,20,20.5

IN CASE THERE IS NO CHANGE IN THE EXCHANGE CALL PROCEDURE LIKE THIS
SP_Update_Exchanges '02-APR-2009',0,0,0 (in this case it will copy from 1-APR-2009


CREATE PROCEDURE [dbo].[SP_Update_Exchanges] 
(@fordate datetime,
 @referencerate decimal(18,6),
 @buy decimal(18,6),
 @sell decimal(18,6))
AS
BEGIN
SET NOCOUNT ON;
select * from exchanges where systemdate = @fordate
if @@rowcount = 1 then
	begin
		update exchanges set currency=@currency,referencerate=@referencerate,buy=@buy,sell=@sell
		where systemdate = @fordate
	end
else if (@buy=0 and @sell=0)
	begin
		SELECT @currency=currency, 
		@referencerate=referencerate, @buy=buy, @sell=sell from exchanges 
		where systemdate = datediff(day,1,@fordate)
 
		insert into exchanges (currency,referencerate,buy,sell,systemdate) 
		values (@currency,@referencerate,@buy,@sell,@fordate)
	end
else
		insert into exchanges (currency,referencerate,buy,sell,systemdate) 
		values (@currency,@referencerate,@buy,@sell,@fordate)
END

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mfhorizonCommented:
CREATE PROCEDURE [dbo].[SP_Update_Exchanges]
(@fordate datetime,
 @referencerate decimal(18,6),
 @buy decimal(18,6),
 @sell decimal(18,6))
AS
BEGIN
SET NOCOUNT ON;
select * from exchanges where systemdate = @fordate
if @@rowcount = 1 then
      begin
            update exchanges set currency=@currency,referencerate=@referencerate,buy=@buy,sell=@sell
            where systemdate = @fordate
      end
else if (@buy=0 and @sell=0)
      begin
            SELECT @currency=currency,
            @referencerate=referencerate, @buy=buy, @sell=sell from exchanges
            where systemdate = datediff(day,1,@fordate)

            insert into exchanges (currency,referencerate,buy,sell,systemdate)
            values (@currency,@referencerate,@buy,@sell,@fordate)
      end
else
            insert into exchanges (currency,referencerate,buy,sell,systemdate)
            values (@currency,@referencerate,@buy,@sell,@fordate)
END
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mfhorizonCommented:
Believing procedure is being called from a program, let me read out the procedure commands.

1. Procedure accepts
   @fordate: the date for which exchange rate to be updated
   @referencerate: reference rate for the date @fordate
   @buyrate for the date @fordate
   @sellrate for the date @fordate
2. Procedure first checks if there is already an entry available in exchangerate table for the date @fordate (in case of multiple updation of exchange rate in same date).
3. If there is already a record for @fordate system will update buy and sell value with @buy and @sell (passed from your program)
4. Else system will check if @buy and @sell values are zero (means there is no change in the exchange rate) system will copy the previous date buy and sell value and will insert a record for date @fordate
5. Finally If above both conditions are not met which means it's a new valid entry procedure will insert a new record for date @fordate in exchange table using the exchange rate passed in procedure paramters.

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techquesAuthor Commented:
Hi, sorry for my very late reply. I tried to change your SP for my need. But, it just copy the last record of exchanges to today.

There are 30 exchanges rates a day. But, it just copy and insert the last record.

And, I do not need to input the buy, sell, reference rate as I write a aspx page to update them.




ALTER PROCEDURE [dbo].[SP_Update_Exchanges] 
@fordate datetime
AS
BEGIN
BEGIN TRAN TRAN_SP_Ex
Declare @currencyid int
Declare @currency nvarchar(50)
Declare @referencerate decimal(18,6)
Declare @buy decimal(18,6)
Declare @sell decimal(18,6)
 
SET NOCOUNT ON;
select * from exchanges where systemdate = @fordate
if @@rowcount <> 1
      begin
            SELECT @currencyid=currencyid, @currency=currency, 
            @referencerate=referencerate, @buy=buy, @sell=sell from exchanges 
            where systemdate = datediff(day,1,@fordate)
 
            insert into exchanges (currencyid,currency,referencerate,buy,sell,systemdate) 
            values (@currencyid,@currency,@referencerate,@buy,@sell,@fordate)
      end
IF @@ERROR <> 0
	ROLLBACK TRAN TRAN_SP_Ex
ELSE
	COMMIT TRAN TRAN_SP_Ex
END

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