Tableshows the valid file operation codes allowed for DISK files processed by keys and Table for DISK files processed by non-keyed methods. The operations shown in these figures are valid for externally described DISK files and program-described DISK files.
Before running your program, you can override a file to another file. In particular, you can override a sequential file in your program to an externally described, keyed file. (The file is processed as a sequential file.) You can also override a keyed file in your program to another keyed file, providing the key fields are compatible. For example, the overriding file must not have a shorter key field than you specified in your program.
Note: When a database record is deleted, the physical record is marked as deleted. Deleted records can occur in a file if the file has been initialized with deleted records using the Initialize Physical File Member (INZPFM) command. Once a record is deleted, it cannot be read. However, you can use the relative record-number to position to the record and then write over its contents.
Valid File Operations for Keyed Processing Methods (Random by Key, Sequential by Key, Sequential within Limits)
Valid File Operations for Non-keyed Processing Methods (Sequential, Random by Relative Record Number, and Consecutive)
IBM - RPG Related Interview Questions
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Ibm - Rpg Tutorial
Overview Of The Rpg Iv Programming Language
Rpg Programming In Ile
Program Creation Strategies
Creating An Application Using Multiple Procedures
Using Source Files
Creating A Program With The Crtbndrpg Command
Creating A Program With The Crtrpgmod And Crtpgm
Creating A Service Program
Running A Program
Calling Programs And Procedures
Rpg And The Ebusiness World
Obtaining A Dump
General File Considerations
Accessing Database Files
Accessing Externally Attached Devices
Using Workstn Files
Example Of An Interactive Application
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