Read e-book online Defensive Database Programming with SQL Server PDF

By Alex Kuznetsov

ISBN-10: 190643445X

ISBN-13: 9781906434458

ISBN-10: 1906434492

ISBN-13: 9781906434496

Resilient T-SQL code is code that's designed to final, and to be appropriately reused by means of others. The target of protective database programming, the target of this ebook, is that will help you to supply resilient T-SQL code that robustly and gracefully handles instances of unintentional use, and is resilient to universal adjustments to the database surroundings. Too usually as builders, we cease paintings once our code passes a couple of simple checks to verify that it produces the 'right consequence' in a given use case. we don't cease to contemplate what different attainable ways that the code will be utilized in the longer term, or how our code will reply to universal alterations to the database setting, comparable to a transformation within the database language surroundings, or a transformation to the nullability of a desk column, etc. within the non permanent, this technique is beautiful; we get issues performed speedier. although, if our code is designed for use for greater than quite a few months, then it's very most likely that such alterations can and may take place, and the inevitable result's damaged code or, even worse, code that silently starts off to act in a different way, or produce varied effects. whilst this occurs, the integrity of our information is threatened, as is the validity of the studies on which severe company judgements are usually established. At this aspect, months or years later, and lengthy after the unique developer has left, starts off the painstaking technique of troubleshooting and solving the matter. wouldn't it be more uncomplicated to avoid all this troubleshooting from occurring? would it be greater to spend a bit extra effort and time in the course of unique improvement, to save lots of significantly extra time on troubleshooting, computer virus solving, retesting, and redeploying? this is often what shielding programming is all approximately: we research what can get it wrong with our code, and we proactively follow this data in the course of improvement. This e-book is full of useful, life like examples of the kinds of difficulties that beset database courses, together with: - alterations in database gadgets, resembling tables, constraints, columns, and saved techniques. - alterations to concurrency and isolation degrees. - improvements to new types of SQL Server. - adjustments in standards. - Code reuse. - difficulties inflicting lack of facts integrity. - issues of blunders dealing with in T-SQL. In every one case, it demonstrates methods that can assist you comprehend and implement (or do away with) the assumptions on which your resolution is predicated, and to enhance its robustness. eventually, the e-book teaches you the way to imagine and strengthen defensively, and the way to proactively determine and get rid of power vulnerabilities in T-SQL code.

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Get Defensive Database Programming with SQL Server PDF

Resilient T-SQL code is code that's designed to final, and to be appropriately reused by way of others. The objective of protecting database programming, the aim of this e-book, is that will help you to supply resilient T-SQL code that robustly and gracefully handles instances of accidental use, and is resilient to universal alterations to the database surroundings.

Extra resources for Defensive Database Programming with SQL Server

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Typically, however, we want either to raise an error when an ambiguity is detected, or to update only what is unambiguous. In SQL Server 2008, we can circumvent such problems with UPDATE…FROM or CTE-based updates, by use of the MERGE command. However, prior to SQL Server 2008, we have to detect these ambiguities. Using MERGE to detect ambiguity (SQL Server 2008 only) If you are working with SQL Server 2008, then easily the best option is to use the MERGE command (covered in further detail in Chapter 4, When Upgrading Breaks Code).

If we rely on that incorrect assumption, our code may not work as expected, so we need to eliminate it. Listing 2-9 demonstrates a case where SELECT leaves the value of a variable unchanged, if the result set is empty. SET NOCOUNT ON ; DECLARE @i INT ; SELECT @i = -1 ; SELECT SELECT WHERE SELECT @i AS [@i before the assignment] ; @i = 1 1 = 2 ; @i AS [@i after the assignment] ; 64 Chapter 2: Code Vulnerabilities due to SQL Server Misconceptions @i before the assignment ------------------------1 @i after the assignment -----------------------1 Listing 2-9: SELECT may leave a variable unchanged if the result set is empty.

This means that it fails to log the change to the WeightInPounds column. Of course, there is no guarantee that the trigger will log the change to the SizeInInches column. On your server, the trigger may log only the change of WeightInPounds but fail to log the change in SizeInInches. Which column will be logged depends on the execution plan chosen by the optimizer, and we cannot assume that the optimizer will always choose one and the same plan for a query. Although the developer of the trigger may not have realized it, the implied assumption regarding its implementation is that ROWCOUNT is set to its default value.

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