Data Structures, Files and Databases by Carl Bamford, Paul Curran

By Carl Bamford, Paul Curran

The textual content is an advent to facts buildings, records and databases applicable to be used as a moment yr BSc Computing textual content, or for the ultimate 12 months of a HND computing device stories path. It presents the reader with an creation to the ideas and underlying thought utilized in the layout of based info. Revised and prolonged, with extra chapters on SQL and 4GL's.

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The procedures GET and PUT can be used directly from a program and values can be moved from and into the file buffers. They could be used instead of the WRITE and READ procedures, except that they make no provision for converting data held in variables of a compatible type. 3 is an example which uses the flle buffer and the GET operation on an input text file. It is a procedure which skips spaces and end-of-line markers in the text flle to position the file at the next non-space character, or at the end of file.

For an input file using the file variable InFile, the flle buffer is referred to as InFilet. There is a procedure, GET, to retrieve the next component from the file and store it in the file buffer: GET( InFile ) When the procedure RESET is used, it retrieves the first component and places it in the file buffer. The end-of-file and end-of-line conditions are set when an attempt is made to move the next value into the buffer and the end of me or end of line is reached. Serial and Sequential Data Files 23 The procedures READ and READLN copy the content of the file buffer to a program variable before issuing another GET.

7. 29 Serial and Sequential Data Files 8/F Master File: key quantity bin Transaction file: key type quantity bin 86271 issue 6 86271 receipt 100 86284 issue 4 L4617 new 100 275 L8917 issue 98 L8917 delete C/F Master File: key quantity bin Figure 2. 7 Master file update. The first record from the brought-forward master ftle has no transactions for it and is copied to the carried-forward ftle. The second record has two transactions which update the stock quantity. The third record has one transaction, while the fourth has none.

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