winforms qr code reader

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Remember that the ef ciency of several plans in our index optimization scale was based on the selectivity of the query. If the selectivity of a query you re tuning varies signi cantly between invocations of the query, make sure that in your tuning process you take this into account. For example, you can prepare tables and graphs with the performance measurements versus selectivity and analyze such data before you make your index design choices. Table 4-10 shows a summary of logical reads versus selectivity of the different levels in the scale for the sample query pattern under discussion against the sample Orders table.

To be blunt, the inventers released EJB before it was ready and sold individual products as if they were mature As a result, the technology as a whole ultimately lost both respect and its early momentum in the marketplace The next two releases of EJB partially or completely resolved most major problems and established EJB as the platform of choice for web-enabled enterprise applications Nothing else comes close as a platform EJB integrates enterprise concerns managing synchronous and asynchronous transactions with an unmatched level of integrated security, performance, and scalability Today, you re probably getting mixed signals regarding the market strength of EJB On one hand, the community is strong and impressive enterprise applications are appearing One of the best ways to judge a technology is by the strength of its third-party community In the case of EJB, you need look no further than TheServerSide TheServerSide.

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com community receives 250,000 new viewers and two million page hits every month That s a staggering number, and it s only the tip of the iceberg for EJB You can also find vibrant and mature markets for thirdparty components, tools, books, periodicals, and consultants J2EE and EJB by extension is now the default development environment on the server tier for today s most successful enterprise applications J2EE applications are appearing in numbers One look at the customer references on the home pages for major commercial Application servers will convince you that customers are building real enterprise applications The clustered deployments made popular by static web applications are now moving into the realm of traditional distributed enterprise applications You could argue that we are only now realizing the benefits promised years ago by supporters of CORBA and DCE.

can be a quality characteristic of a figure, but does not have to be .) The image to the right of the illustration corresponds to such an equal distribution . Naturally, survey results or measurement series data almost always have an asymmetrical distribution . The boxplot indicates the type and scope of this asymmetry . This allows observers to make their own conclusions in relation to the usability of the data in a particular analysis, for example .

On the other hand, a vocal minority is starting to speak out against EJB, and is opting for alternative technologies to use in its place These trends suggest a departure from the EJB-everywhere approach that was heavily sold in the late 1990s For example, growing technologies like JDO and proprietary relational mappers are providing an alternative to EJB for persistence In addition, some.

TABLE 4-3

Occasionally, it can be useful to make the internal features of an assembly accessible to one or more other specific assemblies. If you write a particularly large class library, it might be useful to split it into multiple assemblies much like the .NET Framework class library. But you might want to let these all use one another s internal features, without exposing those features to code that uses your library. Another particularly important reason is unit testing: if you want to write unit tests for an implementation detail of your class, then if you don t want to put the test code in the same project as the class under test, you ll need to grant your test project access to the internals of the code being tested. This can be done by applying an assembly-level attribute, which normally goes in the AssemblyInfo.cs file, which you can find by expanding the Properties section of your project in the Solution Explorer. Attributes are discussed in 17, but for now, just know that you can put the code in Example 15-9 in that file.

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