Re: Defining datastructure with ExtName/LikeRec

[i5@xxxxxxxxx]

Barbara,

> Marco wrote:
> > One difference is about null capable fields.
>
> A DS defined with EXTNAME also defines the relevant subfields as null
> capable.

but this true from V5R3 or even earlier?


> From V5R2 RPG reference:

"Note: If the file used for an externally described data structure has
null-capable fields defined, the null attribute is not used in defining
the RPG subfield."

but the next paragraph states:

"If the field is a multiple-occurrence data structure or a table, an array
of null indicators will be associated with the field. Each null indicator
corresponds to an occurrence of the data structure or element of the
table."


> From V5R3 manual:

"Null-capable fields in externally-described data structures If the file
used for an externally described data structure has null-capable fields
defined, the matching RPG subfields are defined to be null-capable.
Similarly, if a record format has null-capable fields, a data structure
defined with LIKEREC will have null-capable subfields. When a data
structure has null-capable subfields, another data structure defined like
that data structure using LIKEDS will also have null-capable subfields.
However, using the LIKE keyword to define one field like another
null-capable field does not cause the new field to be null-capable."

Thanks
Marco