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| − | [[Category:Database]] | + | #REDIRECT [[Category:DFU]] |
| − | DFU = ''Data File Utility''.
| + | {{artredir|DFU}} |
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| − | DFU can be used | |
| − | * by programmers to update data base files on the fly without writing programs
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| − | * by programmers to set some very simple "programs" to do some very simple functions with some data base file
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| − | * by data entry personnel to key in data to some data base file
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| − | We can use it to create a format or simplistic "program" that will let us update a file one record at a time, or with option 5 from STRDFU, we specify the physical or logical file and member (or *FIRST) then the 400 will setup a dummy set of DFU specifications on the fly, to let us update that file.
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| − | The file layout has to exist before we can access it vie DFU, while we can use DFU to add records.
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| − | With DFU, we can access a file to
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| − | * add records
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| − | ** If we have an old [[IBM Keyboard]] with the DUP key, then when we are on any screen but the first, in a series of screens of records being added, pressing the DUP key in a field, causes the contents to be duplicated from the previous record entered for that field
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| − | * delete records
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| − | * change records
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| − | * display records
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| − | ** the roll keys (page up down) take us through the file of records
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| − | * print records
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| − | The command keys use a different set of rules for DFU on old S/36 as opposed to on OS/400
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