File Management - IBM

If the length of the from-field is greater than the maximum length of the
variable-length to-field, the length portion of the variable-length to-field is set to
the maximum length of the variable-length to-field. The data from the fixed-length
from-field is copied to the data portion of the variable-length to-field and truncated
on the right in a way that ensures data integrity.
Fixed-Length
Character From-Field
(length of eight)
ABCDEFGH mapped 04ABCD
Fixed-Length DBCS-
Only From-Field
(length of eight)
mapped
Variable-Length
Character To-Field
(maximum length
of four)
Variable-Length
DBCS-Only To-Field
(maximum length
of four)
04
RV2H085-1
Date, time, and timestamp fields using FMTOPT(*MAP) or
FMTOPT(*NOCHK)
FMTOPT(*MAP) or FMTOPT(*NOCHK) must be specified on the CPYF command
if:
v The from-file is a database data file.
v The to-file is a physical data file.
v The record formats are not identical.
Corresponding date, time, and timestamp fields in the from-file and to-file must
have the same format attribute and separator for the record formats to be identical.
For the CPYFRMQRYF command, the same is true except that the open query file
record format is used (rather than a from-file format).
When using FMTOPT(*NOCHK), record data is copied directly from left to right
into the to-file without any regard to field types.
When using FMTOPT(*CVTSRC), data portions of records are directly copied from
left to right into the to-file without any regard to the field types.
When using FMTOPT(*DROP), fields in the from-file but not in the to-file are
dropped. If any like-named fields in the from-file and to-file are date, time, or
timestamp fields, the corresponding field must be the same type, have the same
format attribute and separator, and have the same relative position in the record
format as the like-named field, otherwise FMTOPT(*MAP) may also be required.
FMTOPT(*MAP) allows copying between like date, time, and timestamp field
types regardless of the format or separator. Also, copies from and to date, time,
and timestamp fields are allowed from and to zoned-decimal or character field
types, provided the lengths, formats, and values can be converted.
FMTOPT(*MAP) is required in this case for conversion to the to-field type (format
and separator, if it applies).
Chapter 4. Copying files 111