Copy commands support for null values

You can copy files that contain null-capable fields by using the CPYF and CPYFRMQRYF commands. The FMTOPT parameter allows mapping of null-capable fields.

The INCREL parameter allows the selection of records that are based on whether a field is or is not null.

While copying the records to the to-file, the following commands ignore null values in the from-file:

CPYTOTAP: CPYTODKT
CPYFRMTAP: CPYFRMDKT

The following conditions or values on the CPYF or CPYFRMQRYF command ignore null values in the from-file while copying the records to the to-file:

FMTOPT(*NOCHK)
FMTOPT(*CVTSRC)
Device to-file

Record selection involving null values can still be done, but only the user-specified or default value in the buffer (rather than a null value) is copied to the to-file. Null values cannot be preserved in these instances. Any print listings produced when a copy command is run (including TOFILE(*PRINT), PRINT(*COPIED), PRINT(*EXCLUDE), and PRINT(*ERROR)) also ignore null values.