Visual DataFlex
Visual DataFlex is a 4GL windows programming language by Data Access, targeted at creating database and client-server type programs.
Architecture
Visual DataFlex has a 3-layer architecture:
- 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.
- 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.
- Top layer
- A graphical user interface (GUI) that allows users to enter, find, create, modify, or delete data.
History
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Data Access is the company behind the language and has build its business up around the console mode DataFlex language. 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.
External links
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