15. Interactive Programs – ILE RPG in Easy Bytes

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ILE RPG in Easy Bytes

In Unit 15 you learn how to define display files, and how to use them to develop interactive applications.

This course is a unit of the ILE RPG in Easy Bytes  series, a complete introductory ILE RPG programming self-guided tutorial.

 

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Writing Interactive Applications

Creating Display Files

In batch processing, once a program begins to run, it continues to execute instructions without human intervention or control. Most batch applications in the business environment involve processing one or more transaction files sequentially. The programs end when the transaction files reach end-of-file.
Coding Interactive Programs

Recall that the user wants to enter a customer identifier to request information from the Customers file. The program should display the retrieved information on the screen. The user can then enter another customer identifier or signal that he or she is finished by pressing F3.
Additional DDS Considerations

More important perhaps, as the DDS is presently coded, numeric fields display without editing, and information about a possible important program event (e.g., a customer not found in the file) is not conveyed to the user.
Interactive Program Examples

adding, changing, and deleting records in a company’s database files. In a typical maintenance program, the user specifies the key of a record and signals whether to add, change, or delete that record. Because businesses typically want key field values to master records to be unique (e.