Defensive Database Programming - Red Gate Software

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Chapter 6: Common Problems with Data Integritydebugging output: data after updateItemLabelBarcode------------------------------ ------------------------------Lamp 123457(1 row(s) affected)old and new barcode as stored in variablesOldBarcodeNewBarcode-------------------- --------------------123456 123457(1 row(s) affected)(1 row(s) affected)(1 row(s) affected)ItemLabel OldBarcode NewBarcode--------------- -------------------- --------------------Lamp 123456 123457(1 row(s) affected)Listing 6-47: One row is modified and our trigger logs the change.Our trigger works for single-row updates, but how does it handle multi-row updates?Listing 6-48 empties the change log table, adds one more row to the Items table,updates two rows in the Items table, and then interrogates the log table,dbo.ItemBarcodeChangeLog, to see what has been saved.SET NOCOUNT ON ;BEGIN TRANSACTION ;DELETE FROM dbo.ItemBarcodeChangeLog ;INSERT INTO dbo.Items( ItemLabel ,BoxLabel ,196
Chapter 6: Common Problems with Data IntegrityBarcode ,WeightInPounds)VALUES ( 'Flashlight' ,'Camping Gear' ,'234567' ,1) ;UPDATE dbo.ItemsSET Barcode = Barcode + '9' ;SELECT ItemLabel ,OldBarcode ,NewBarcodeFROM dbo.ItemBarcodeChangeLog ;-- roll back to restore test dataROLLBACK ;debugging output: data before updateItemLabelBarcode------------------------------ ------------------------------Lamp 123457Flashlight 234567debugging output: data after updateItemLabelBarcode------------------------------ ------------------------------Lamp 1234579Flashlight 2345679old and new barcode as stored in variablesOldBarcodeNewBarcode-------------------- --------------------234567 2345679197
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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 2: Code Vulnerabilitiesdue
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Chapter 3: Surviving Changes to Dat
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Chapter 4: When Upgrading Breaks Co
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Chapter 5: Reusing T-SQL CodeThe Da
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Chapter 5: Reusing T-SQL CodeIt is
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Chapter 5: Reusing T-SQL CodeAverag
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Chapter 5: Reusing T-SQL CodeBEGINS
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Chapter 5: Reusing T-SQL CodeWe als
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Chapter 5: Reusing T-SQL CodeLet's
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Chapter 5: Reusing T-SQL CodeStateC
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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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