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In the relational world, it is extremely important that the same conceptual data not be replicated throughout the database. The importance of avoiding redundancy stems from two facts. First, most databases hold a huge amount of data. For example, it is easy to think that storing department name and location in a table with employee information is no big deal. The problem is that if a thousand employees work in the same department, the department information would be duplicated across a thousand employee table rows! If a department location changes, you would have to accurately update each of the records for the thousand employees who work for the department. Second, this redundancy can easily lead to inconsistency. Both of these problems can be solved by storing a foreign key to the department table (say department ID) in the employee table instead. Relational theory has formalized the process of checking the database design for redundancy. This process is called database normalization. IBM researchers initially proposed three different levels of normalization: first, second, and third normal form, each consisting of a well-defined, incrementally strict set of rules to check for database fitness. Later, more levels were introduced: BCNF (Boyce-Codd Normal Form), fourth, and fifth normal form. Relational theory recognizes the fact that normalization can lead to trading off speed for space efficiency. Most DBAs go through the process of selective denormalization when faced with tricky performance issues.

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asp.net code 39

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identity is based on the assembly identity, the two types will have different identities even if they originate from the same static library. For native DLL projects, it is not recommended to integrate managed wrapper types into the DLL, because this would implicitly create a load-time dependency to the CLR 2.0. As a consequence, users of your library would then be required to ensure that version 2.0 of the CLR is installed on the target machine and that the target application does not load an earlier CLR version, even if only native code of the library is executed.

Coverage of SQL syntax is well beyond the scope of this appendix. However, at least a basic grasp of SQL is essential to understand chapters 8, 9, and 10. If you don t already have a working knowledge of SQL, we highly recommend that you investigate it on your own.

asp.net code 39

Packages matching Tags:"Code39" - NuGet Gallery
NET library to generate common 1D barcodes ... Supported barcode types: • QR code • Data Matrix • Code 39 • Code 39 Extended • Code 128 • Code 11 •.

asp.net code 39

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eb services technology has evolved rapidly since its debut a few years ago. Businesses were initially reluctant to fully adopt the technology because of a lack of industry-standard specifications to govern such important issues as message security and reliable delivery. Businesses will not send sensitive information across the wire if it is vulnerable to detection. And they will not implement large-scale distributed systems with this technology if the reliability of the messages cannot be guaranteed. This chapter lays the groundwork for the second half of the book, where we will focus intensively on how to implement WS- specifications using Microsoft s Web Services Enhancements 3.0 for .NET. This chapter includes the following: Overview of the WS- specifications Introduction to Web Services Enhancements (WSE) 3.0 Installing and configuring WSE 3.0, including the test certificates Using the WSE 3.0 utilities This chapter is a must-read in order to get the most out of the second half of the book. It will help you to understand the WS- specifications and how WSE fits into the context of SOA. It will also get you started with installing and configuring WSE 3.0, including the test certificates, which are required for many of the code samples.

In this appendix, we list all the EJB 3 annotations we talked about throughout the book. This appendix is designed to be a quick reference you can use while developing your enterprise application. See the individual chapters for the full details of each annotation. The annotations are organized by topic, roughly following the same sequence as the chapters.

These annotations are used for stateless and stateful session beans. javax.ejb.Stateless Marks a POJO as a stateless session bean.