An ID expression is a string expression that evaluates to an item-ID, for use in all types of read and write statements.
Example(s)
In this example, the ID expression is "12345".
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read invoice.item from invoice.file,"12345" else... |
In this example, the value entered into the variable ID is used as the ID expression:
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input ID read record from file,ID else... |
Both the literal string 'last-ID' and the arithmetic expression last-ID+1 are ID expressions.
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read last-ID from ctlfile,'last-ID' then write item on datafile,last-ID+1 write last-ID+1 on ctlfile,'last-ID' end |
See Also