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You can use a similar approach to add flexibility to your code because you can keep the connection string out of the compiled code. This way of storing the connection string also makes the information global to the application and easily callable from any modules. You can store any data in the <appSettings> section that can be rendered with a flat name/value pair. However, this approach is far from perfect. Connection strings are a critical parameter for the application and typically contain sensitive data, so at a minimum they need transparent encryption. Although connection parameters can be rendered as semicolon-separated strings, a connection string is more than a plain string and deserves special treatment from the framework.

Redeploy the assembly, drop and re-create the #tmp table, and check its structure again . This time you should get NVARCHAR(80) for the cn column .

-- Alter assembly to check the SqlFacet attribute -- Drop the #tmp table USE InsideTSQL2008; DROP TABLE #tmp; ALTER ASSEMBLY ComplexNumberCS FROM 'C:\InsideTSQL2008\ComplexNumber\ComplexNumberCS\bin\Debug\ComplexNumberCS.dll' GO -- SELECT INTO with string and other presentations SELECT id, cn.ToString() AS cn, cn.Real AS [Real part], cn.Imaginary AS [Imaginary part], cn.RealInt AS [Real part int]

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Figure 8-11: Partial model of file API. Random Models Another simple form of model-based testing is monkey testing. A monkey test [1] generates random (or pseudo-random) input with the hope of finding a bug. Monkey tests are common in stress testing and are typically not difficult to create. I wrote an extremely simple one several years ago that looked something like the pseudo-code in Listing 8-1. Listing 8-1: Sample Monkey Test

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After you finished with testing of the SqlFacet attribute, drop the temporary table:

The next issue I am interested in is indexing . Because the serialized values of the ComplexNumberCS type are byte ordered, you can create an index on a column of this type:

Whidbey configuration files define a new section that was created to contain connection strings (such as SQL connection strings). The section is named <connectionStrings>. Its structure is shown here:

Now I would like to create an index on the Real property:

Launch Text Editor // "simulate" typing Repeat 1000 times //slightly less than infinite, but suitable for this example! { Repeat 500 { Press Random Key } Select some portion of text Select Random Font, Font Size, and Font Color Press one of ToolBar Buttons [Cut | Copy | Paste | ] } Close Text Editor

CREATE INDEX CNUsage_Real ON dbo.CNUsage(cn.Real);

<connectionStrings> <add name="CustomersDB connectionString="SERVER= ;DATABASE= ;UID= ;PWD= ; /> <add name="CustAccessDB connectionString="~\DATA\CustDB.mdb /> </connectionStrings>

If you try this statement, you get a syntax error . This is because you can only index columns, not properties of a column . What you can do when you want to index a property is create a computed column from a property and persist and index the computed column, so long as the column definition allows the PERSISTED property and can be used as an index key . Refer to SQL Server Books Online for the requirements regarding persisting and indexing a computed column . Two limitations are relevant here: the expression must be deterministic and it must be precise . Properties that return float values are not precise . That s why I created the additional RealInt property, which returns an integer representation of the real part of a complex number . This property should return deterministic and precise values . Let s try to alter the table and add a persisted computed column using this property:

This test was fun to watch, but the only bug it ever found was a slight memory leak (which is a critical bug on embedded systems). The drawback of monkey tests is that they are generally difficult to debug. Finding the exact combination of commands that led to the memory leak required that I write some additional tests. In this case, it was a leak in the Clipboard functionality, so a targeted test on cut, copy, and paste would have found the bug sooner. Grammar Models Another common form of MBT is testing with a grammar model. A grammar model describes the characteristics and structure of data such as an e-mail address, name, or text. Regular expressions are an example of an implementation of a grammar model. A common use of

ALTER TABLE dbo.CNUsage ADD RealInt AS cn.RealInt PERSISTED;

You can manipulate the contents of the section by using <add>, <remove>, and <clear> nodes. You use an <add> node to add a new connection string, <remove> to remove a previously defined connection, and <clear> to reset all connections and create a new collection. By placing a web.config file in each of the application s directories, you can customize the collection of connection strings that are visible to the pages in the directory. Note that each stored connection is identified with a name. This name references the actual connection parameters throughout the application. Connection names are also used within the configuration file to link a connection string to other sections, such as the <providers> section of <membership> and <personalization>. The <connectionStrings> section is a global and centralized repository of connection information.

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