如何按顺序运行sql脚本？

Question

I have three actions to execute in one stored procedure. The issue is I need to make sure actions are executed if the previous action is completed.

For example: Action 2 must start execution after Action 1 is completed.

Please advise me on how to implement to get the above achieve.

Codes:

Action - 1

UPDATE Products 
SET MarkDownPrice = price + adjustment, 
    MarkDownDate = startdate, MarkedDown = 1
FROM Products p
JOIN PriceChanges pc ON p.SKU = pc.SKU and dateprocessed is null
WHERE pc.SKU = @SKU

Action - 2

UPDATE StyleColour 
SET isDirty = 1
FROM StyleColour sc
JOIN Products p ON sc.styleID = p.merretStyleID AND sc.Colour = p.MerretColour
WHERE SKU = @SKU

Action - 3

UPDATE pricechanges 
SET dateProcessed = getdate()
WHERE SKU = @SKU and dateprocessed is null

Answer 1

There are two ways in which you could do it.

• Using @@error variable after each statement and checking it for non zero value (which i think is not the best way to do) which means error has occured so you just return from that pointing rolling back your tranaction.

• Using Try catch.. something of sort:

   BEGIN TRY { sql_statement | statement_block } END TRY BEGIN CATCH { sql_statement | statement_block } END CATCH

  if you catch any error, just return from that point by rolling back the transaction.