Visual DataFlex: Difference between revisions
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#Redirect [[DataFlex]] |
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'''Visual DataFlex''' is a 4GL windows [[programming language]] by [[Data Access (company)|Data Access]], targeted at creating [[database]] and client-server type programs. |
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== Architecture == |
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Visual DataFlex has a 3-layer architecture: |
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;Bottom layer: Tables at this level represent customer information. Data dictionaries for each table define the rules for saving, editing, deleting, or finding a customer. |
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;Middle layer: Tables at this level represent orders to customers. A ''Data Dictionary Connectivity Object Tree'' defines how tables relate to each other, and ensures that all business rules of the connected tables are in force and validate. |
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;Top layer: A graphical user interface ([[GUI]]) that allows users to enter, find, create, modify, or delete data. |
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== History == |
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{{Cleanup-section|date=February 2008}} |
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Data Access Worldwide of Miami, USA is the company behind the studio and language and built its business up around the console mode [[DataFlex]] language which was released prior to [[MS-DOS|DOS]] and competed with [[dBase|dBase II]] in early microcomputer technology. The first attempt at a windows product was ''DataFlex for Windows'' which failed as it was a sort of windows bolted on top of DOS product. Then they released Visual DataFlex 4.0 in 1997 which allowed users to write native 32 bits Windows applications. Every 6 months a new revision level is released. Visual DataFlex is now in revision 15, named VDF 2009<Ref>[http://www.visual-dataflex.co.uk/Include/ElectosFileStreaming.asp?FileId=861 Visual DataFlex 2009/15.0 – Overview]</Ref>, and features a datadictionary layer of business rules which is of dual use with the windows product and the webapp extension. |
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== References == |
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<references /> |
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== External links == |
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* [http://www.visualdataflex.com Official website] |
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* [http://www.vdfwiki.com vdfwiki.com] |
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* [http://support.dataaccess.com/forums/ Support forum] |
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{{compu-lang-stub}} |
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[[Category:4GL]] |
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[[ms:Visual DataFlex]] |
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[[ru:Visual DataFlex]] |
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Latest revision as of 16:13, 19 March 2017
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