Troubleshooting
Problem
The following document will explain how you can define null-capable variables in an ILE RPG program.
Resolving The Problem
ALWNULL(*USRCTL) must be specified on the H-Spec or the command parameter to process or define null capable fields.
Here are the ways that an RPG program can make use of null-capable fields from database files:
A comprehensive discussion of this topic is available in this presentation:- Working_with_null_capable_fields_v2.pdf
Aside from parameters defined with OPTIONS(*NULLIND), null-capable fields can be implicitly defined from null-capable fields in externally-described files or data structures. Prior to 7.3, there is no RPG support for defining program-described fields as being null-capable. Starting in 7.3, you can also define program-described fields as being null-capable by using the NULLIND keyword.
Here are the ways that an RPG program can make use of null-capable fields from database files:
| 1. | When the file is defined on an F spec, the null-capable fields from the file will be null-capable fields or subfields in the RPG program. |
| 2. | When a data structure is defined using the LIKEREC keyword with a record from the file, the null-capable fields from the file will be null-capable subfields of that data structure. |
| 3. | When an externally-described data structure is defined from the file, the null-capable fields from the file will be null-capable subfields of that data structure. |
| 4. | When a data structure is defined LIKEDS of a data structure containing null-capable subfields, the new data structure will have corresponding null-capable subfields. |
A comprehensive discussion of this topic is available in this presentation:- Working_with_null_capable_fields_v2.pdf
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Historical Number
499433341
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Document Information
More support for:
IBM i
Component:
Programming ILE Languages
Software version:
All Versions
Operating system(s):
IBM i
Document number:
635347
Modified date:
07 November 2024
UID
nas8N1013467
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