ILE RPG Language Reference
In an ILE RPG program, you can select one of three different
ways of handling null-capable fields from an externally described
database file. This depends on how the ALWNULL
keyword on a control specification is used (ALWNULL can also be
specified as a command parameter):
- ALWNULL(*USRCTL) - read, write, update,
and delete records with null values and retrieve and position-to records
with null keys.
- ALWNULL(*INPUTONLY) - read records with
null values to access the data in the null fields
- ALWNULL(*NO) - do not process records with
null values
Note:
For a program-described file, a null value in
the record always causes a data mapping error, regardless of the value
specified on the ALWNULL keyword.
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