Defensive Database Programming - Red Gate Software

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Chapter 7: Advanced Use of ConstraintsINSERT INTO dbo.InventoryLog( ItemID ,ChangeDate ,ChangeQuantity ,CurrentQuantity ,PreviousChangeDate ,PreviousQuantity)VALUES ( 1 ,'20100101' ,10 ,10 ,NULL ,NULL);INSERT INTO dbo.InventoryLog( ItemID ,ChangeDate ,ChangeQuantity ,CurrentQuantity ,PreviousChangeDate ,PreviousQuantity)VALUES ( 2 ,'20100101' ,5 ,5 ,NULL ,NULL);Listing 7-28: Adding two items to the Inventory table.Our first real tests, shown in Listing 7-29, prove that we cannot save a rowwith incorrect CurrentQuantity, even if we also enter the wrong value forPreviousQuantity.238
Chapter 7: Advanced Use of ConstraintsINSERT INTO dbo.InventoryLog( ItemID ,ChangeDate ,ChangeQuantity ,CurrentQuantity ,PreviousChangeDate ,PreviousQuantity)VALUES ( 2 ,'20100102' ,-2 ,1 , -- CurrentQuantity should be 3'20100101' ,5);Msg 547, Level 16, State 0, Line 1The INSERT statement conflicted with the CHECK constraint"CHK_InventoryLog_ValidChange". The conflict occurred indatabase "test2", table "dbo.InventoryLog".The statement has been terminated.INSERT INTO dbo.InventoryLog( ItemID ,ChangeDate ,ChangeQuantity ,CurrentQuantity ,PreviousChangeDate ,PreviousQuantity)VALUES ( 2 ,'20100102' ,-2 ,1 ,'20100101' ,3 -- PreviousQuantity should be 5);239
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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 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 CodeBEGINS
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Chapter 5: Reusing T-SQL CodeBEGIN
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Chapter 5: Reusing T-SQL CodeSELECT
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Chapter 5: Reusing T-SQL CodeINSERT
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Chapter 8: Defensive Error Handling
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Defensive Database Programming - Red Gate Software

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