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DECLARE @cols AS NVARCHAR(MAX), @sql AS NVARCHAR(MAX); -- Construct the column list for the IN clause -- e.g., [2006],[2007],[2008] SET @cols = STUFF( (SELECT N','+ QUOTENAME(name) AS [text()] FROM (SELECT name FROM sys.columns WHERE object_id = OBJECT_ID(N'dbo.CustOrders') AND name NOT IN(N'custid')) AS D ORDER BY name FOR XML PATH(''), TYPE).value('.[1]','VARCHAR(MAX)'), 1, 1, N''); -- Construct the full T-SQL statement -- and execute dynamically

There are many ways to evaluate the effectiveness of a testing technique or approach Defect detection effectiveness (DDE) is one of the most common measures of test effectiveness (although it is completely arbitrary except in controlled academic environments where the total number of defects is known or in environments where the number of defects can be predicted using defect density ratios and other measures) Because exposing defects is the most readily apparent result of testing, you can analyze the DDE of n-wise testing Many studies suggest that a large number of defects result from the combinations of variable states of interdependent parameters, and that more than 50 percent of all interdependent fault defects result from simple pair interactions or pair-wise combinations.

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a custom control derived from WebPart. Note that if you use a user control, the ASP.NET runtime wraps it into an instance of the GenericWebPart control, which provides basic Web Parts capabilities. You can t use the GenericWebPart component alone. GenericWebPart wraps only one server control. To generate a user interface that aggregates multiple controls, you have two options:

SET @sql = N'SELECT custid, orderyear, val FROM dbo.CustOrders UNPIVOT(val FOR orderyear IN(' + @cols + N')) AS U;'; EXEC sp_executesql @sql;

Here, instead of querying the attribute list from the data table, you query the column list from the sys .columns view .

If you use a user control, you can t specify WebPart-specific properties such as Title. A possible workaround is to implement the IWebPart interface in your user control. Table 3-2 lists the main properties of the WebPart class and gives you an idea of the programming power of the Web part controls. The class indirectly inherits WebControl and Panel, so it also features quite a few extra visual properties, such as BackColor and BackImageUrl (not listed in the table).

One academic study [8] "found no significant difference" in the DDE of n-wise versus randomly selected combinatorial test suites in which each test was programmatically chosen from a matrix of all possible combinations Another industry study [9] found 98 percent of all detectable combinatorial faults using a combination of BC and pair-wise testing And more recent industry studies conclude that subtle combinatorial defects might still be exposed by sequentially increasing the number of combinations up to 6-wise coverage So, I recommend that testers start with BC and pairwise testing, and then both randomize the pair-wise output and sequentially increase the number of n-wise combinations to a maximum of 6-wise coverage Another way to measure effectiveness of testing is to look at the information the tests are providing A lot of empirical data proves most black box-designed and executed tests provide less than 65 percent structural coverage of a complex program.

One of the greatest security risks and causes of great damage to computerized systems is a hacking technique called SQL injection . By using SQL injection, hackers inject their own malicious code into statements you execute dynamically on your SQL Servers, often from accounts with elevated privileges . An attacker can launch a SQL injection attack when you construct code by concatenating strings . I ll explain and demonstrate SQL injection techniques by presenting examples of both client-based attacks and server-based attacks . I ll then explain what measures you can take to block some of the attacks . But bear in mind that sophisticated attackers have very innovative minds; if you construct code that concatenates strings based on user input or stored data or metadata, it s almost impossible to block SQL injection attacks altogether . In this section I ll demonstrate a couple of simple examples for SQL injection attacks and provide a few suggestions regarding protective measures that you can take . This section is by no means complete . As I mentioned earlier, you can find a lot of information about the subject on the Internet and in other resources, and I also pointed out an excellent article on the subject that appears in SQL Server Books Online .

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