Defensive Database Programming - Red Gate Software

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Chapter 7: Advanced Use of ConstraintsVALUES ( 1 ,1 ,'Cannot print TPS report' ,'Active' ,'Active') ;Msg 547, Level 16, State 0, Line 1The INSERT statement conflicted with the FOREIGN KEYconstraint "FK_Tickets_Developers_WithStatus". The conflictoccurred in database "test2", table "dbo.Developers".The statement has been terminated.Listing 7-8: The DeveloperStatus must match the Status of theassigned developer.Listing 7-9 shows that we can add a closed ticket, but cannot reopen it, while thedeveloper is still on vacation.INSERT INTO dbo.Tickets( TicketID ,AssignedToDeveloperID ,Description ,TicketStatus,DeveloperStatus)VALUES ( 1 ,1 ,'Cannot print TPS report' ,'Closed' ,'Vacation') ;(1 row(s) affected)UPDATE dbo.TicketsSET TicketStatus = 'Active'216
Chapter 7: Advanced Use of ConstraintsWHERE TicketID = 1 ;Msg 547, Level 16, State 0, Line 1The UPDATE statement conflicted with the CHECK constraint"CHK_Tickets_ValidStatuses". The conflict occurred indatabase "test2", table "dbo.Tickets".The statement has been terminated.Listing 7-9: Adding a closed ticket and a failed attempt to reopen it.Thanks to the ON UPDATE CASCADE clause on our FOREIGN KEY constraint, when ourdeveloper returns from vacation and is active again, his changed status, as reflected inthe Developers table, is automatically propagated to the DeveloperStatus columnof the Tickets table, as demonstrated in Listing 7-10.PRINT 'DeveloperStatus when Justin is on vacation' ;SELECT TicketID ,DeveloperStatusFROM dbo.Tickets ;UPDATE dbo.DevelopersSET DeveloperStatus = 'Active'WHERE DeveloperID = 1 ;PRINT 'DeveloperStatus when Justin is active' ;SELECT TicketID ,DeveloperStatusFROM dbo.Tickets ;DeveloperStatus when Justin is on vacationTicketID DeveloperStatus----------- ---------------1 Vacation(1 row(s) affected)217
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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 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 CodeLet's
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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 6: Common Problems with Dat
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Chapter 8: Defensive Error Handling
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Defensive Database Programming - Red Gate Software

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