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Dynamic SQL: Applications, Performance, and Security by Ed Pollack

By Ed Pollack

This ebook is an creation and deep-dive into the various makes use of of dynamic SQL in Microsoft SQL Server. Dynamic SQL is vital to large-scale looking dependent upon user-entered standards. it is also beneficial in producing value-lists, in dynamic pivoting of information for company intelligence reporting, and for customizing database gadgets and querying their constitution. Executing dynamic SQL is on the middle of purposes resembling company intelligence dashboards that have to be fluid and reply immediately to altering person wishes as these clients discover their information and examine the consequences. but dynamic SQL is feared through many because of issues over SQL injection assaults. studying Dynamic SQL: purposes, functionality, and defense is your chance to benefit and grasp a frequently misunderstood function, together with safety and SQL injection. All elements of safeguard correct to dynamic SQL are mentioned during this booklet. you'll research some ways to save lots of time and increase code extra successfully, and you may perform at once with safety situations that threaten businesses all over the world each day. Dynamic SQL: purposes, functionality, and safeguard is helping you convey the productiveness and user-satisfaction of versatile and responsive functions for your association effectively and securely. Your organization's elevated skill to reply to quickly altering enterprise situations will construct aggressive virtue in an more and more crowded and aggressive international market.

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Additional info for Dynamic SQL: Applications, Performance, and Security

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Info CHAPTER 2 ■ PROTECTING AGAINST SQL INJECTION Listing 2-10. Password; SELECT '''; QUOTENAME handles the apostrophe cleansing for you, and as a result, you no longer need to wrap the last name portion of the command string in additional apostrophes. The output of this stored procedure is exactly the same as in the last example. Each name is correctly delimited with apostrophes to ensure that the search criteria will not cause any opportunities for errors to occur. In addition to apostrophes, QUOTENAME can be used to delimit square brackets ([, ]), as well as a quotation mark (").

Person WHERE LastName = '''; SELECT @search_criteria = 'O''Brien'; SELECT @CMD = @CMD + @search_criteria; SELECT @CMD = @CMD + ''''; EXEC sp_executesql @CMD; The results are not what the user expected. Instead of getting their info, they get a SQL Server error: Msg 102, Level 15, State 1, Line 322 Incorrect syntax near 'Brien'. Msg 105, Level 15, State 1, Line 322 Unclosed quotation mark after the character string ''. Person WHERE LastName = 'O'Brien' The apostrophe within “O’Brien” broke the command string, closing the string after the “O” in “O’Brien”.

Info CHAPTER 1 ■ WHAT IS DYNAMIC SQL? In these examples, you are stripping out a variety of characters from the current date/time string. A single REPLACE can be used to remove a specific character, or several can be used to remove additional characters as well. The first example replaces all spaces with empty strings, thereby removing them from the string. The second query also removes colons, and the final additionally removes AM or PM from the timestamp. This is a frequent tactic used when cleansing strings to be used in file names, labels, or a standard name for catalog data.

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