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The ICONIX Process supports a conceptual design stage, which uses robustness diagrams as an intermediate representation of a use case at the conceptual level. The robustness diagram is a pictorial version of a use case, with individual software behaviors ( controllers ) linked up and represented on the diagram.2 Figure 6 1 shows an example robustness diagram created for the Advanced Search use case. Notice that each step in the use case s description (on the left) can be traced along the diagram on the right. A robustness diagram is made up of some key pictorial elements: boundary objects (the screens or web pages), entities (classes that represent data, and, we hope, some behavior too), and controllers (the actions, or verbs, or software behavior). Figure 6 1 shows what each of these looks like:

ata persistence in Axapta is a complex issue, and in practice as you have surely noticed by now, Axapta stores data in different formats in flat files as well as in a relational database, and provides different techniques and tools for exchanging data with other systems. In this chapter we ll look at the following: What data is stored in flat files How Axapta works with its supported relational database management systems Managing the database layer Differences between Microsoft SQL Server and Oracle Limitations Axapta imposes when working with the supported databases Exchanging data with other systems Since for the most part we have used Microsoft SQL Server as our reference database in this book, in this chapter we will present the important differences between SQL Server and Oracle to help you if you are using Oracle. We would like to call your attention to the importance of knowing your database system well and, in particular for developers, the importance of good database design. Bad database design is the cause of many performance problems with Axapta, and combined with bad coding it will run any system into the ground. However, much of the database design and code we all have has been produced by others and it would be impractical to rewrite it; but by knowing your database system well, you can often improve performance by tweaking it.

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You have already encountered numerous situations in which Axapta uses flat files to store data. Axapta uses files to store system data such as definitions for forms, reports, and basically all the objects you can see in the AOT. The same applies to labels, help information, and the X++ code. Furthermore, Axapta allows you to save and read different types of information such as configuration-key setups, startup configuration settings, and logs in files. These vary in format but for the most part are plain text, so you can open them with a text editor. The formats vary, but Axapta provides all the necessary tools to read, write, and manipulate them.

2 For more about conceptual design and drawing robustness diagrams to disambiguate your use case scenarios, see 5 of Use Case Driven Object Modeling with UML: Theory and Practice.

Before we look at DOM methods for adding markup to a document in the web browser, let s briefly review a couple techniques that developers have used in the past: document.write and innerHTML.

Because 17 provides a description of all the files that make up the Axapta system, for the most part this chapter will focus on the data that Axapta stores in the database system of your choice i.e., the business data that is persisted to Microsoft SQL Server or Oracle. The only exceptions here are the tools used for exchanging business data with external systems that rely on files. They are covered in the Import and Export section of this chapter. It s important to know that the data that is stored in external files is system data, data that has been exported, or data that is available to import into Axapta. The most important of these that are not covered in 17 are as follows: XPO files used for the following: Saving definitions of objects or object branches from the AOT Exporting configurations made with the client and server configuration utilities CFG files used for exporting configuration key setups AXC files used for saving configurations made with the client and server utilities that can be used as shortcuts for starting Axapta with the configuration data they contain TXT files used for license codes DAT and DEF files used for Axapta business data; typically used for exchanging data between systems XLS files used for saving Microsoft Excel templates containing definitions of Axapta tables that can be used to import data from other systems That s it in a nutshell.

Note In Flex, MXML files are the boundary objects. The Advanced Search widget will be mapped out in

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