Updating record in random access file
And, using this method, if we add fields to or remove fields from the structure, we don't have to worry about recalculating the total the record position within the file that is read.The record position is "one-based", meaning the first record position in the file is 1, the second record position is 2, and so on. When you sign in to comment, IBM will provide your email, first name and last name to DISQUS.
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Data that is formatted and written to a sequential-access file cannot be modified without reading and writing all the data in the file, it is possible but very awkward.
Compare that to reading or writing a sequential file, where to get to a specific record, you must read through all preceding records.
The difference between random access and sequential access can be likened to accessing music on a CD versus a cassette tape.
The record variable is a variable defined on the UDT record structure as described above.
Once the Get statement is executed, the data from the file record can be referenced using the following syntax: recordname.fieldname is the record position within the file which is written.The file structure is like a railroad train which has many carts (all the same size), some empty and some that contain contents.
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