Defensive Database Programming - Red Gate Software

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Chapter 5: Reusing T-SQL CodeLet's say we have a stored procedure that returns all sales for the month, across all states,as shown in Listing 5-13.CREATE PROCEDURE dbo.SelectSalesForMonth @AsOfDate DATETIMEASBEGIN ;SELECT Amount ,StateCodeFROM dbo.SalesWHERE SaleDateTime >= DATEADD(day, -29, @AsOfDate)AND SaleDateTime
Chapter 5: Reusing T-SQL Code( Amount ,StateCode)EXEC dbo.SelectSalesForMonth @AsOfDate ;SELECT SUM(Amount) AS TotalSalesForMonth ,StateCodeFROM @SalesForMonthGROUP BY StateCodeORDER BY StateCode ;END ;GOListing 5-14: The SelectSalesPerStateForMonth stored procedure, which reusesthe SelectSalesForMonth stored procedure and returns total sales perstate for the month.We can run a smoke test to verify that our two stored procedures work.EXEC dbo.SelectSalesForMonth @AsOfDate = '20091002' ;EXEC dbo.SelectSalesPerStateForMonth @AsOfDate = '20091002' ;Listing 5-15: Testing the new stored procedures.So far so good; we have reused the code wrapped in SelectSalesForMonth procedureand it works. However, now suppose we want to select the state with the highest totalsales for a given month. It looks as if we can simply reuse the SelectSalesPerState-ForMonth procedure, again with a slight modification to create a table variable or atemporary table, as shown in Listing 5-16.CREATE PROCEDURE dbo.SelectStateWithBestSalesForMonth@AsOfDate DATETIMEASBEGIN ;DECLARE @SalesForMonth TABLE(TotalSales DECIMAL(10, 2) ,143
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Chapter 2: Code Vulnerabilities due
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Enforcing Data Integrity in the App
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About the AuthorAlex Kuznetsov has
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IntroductionResilient T-SQL code is
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IntroductionCh. 02: Code Vulnerabil
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IntroductionSpecific examples demon
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IntroductionWhat this book does not
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Chapter 1: Basic Defensive Database
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Chapter 3: Surviving Changes to Dat
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Chapter 6: Common Problems with Dat
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Chapter 7: Advanced Use ofConstrain
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Chapter 7: Advanced Use of Constrai
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Chapter 8: Defensive ErrorHandlingT
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Chapter 8: Defensive Error Handling
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Defensive Database Programming - Red Gate Software

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