Adding records to a VSAM file
Use the COBOL WRITE
statement to add
a record to a file without replacing any existing records. The record
to be added must not be larger than the maximum record size that you
set when you defined the file. Your program should check the file
status key after each WRITE
statement.
Adding
records sequentially: Use ACCESS IS SEQUENTIAL
and
code the WRITE
statement to add records sequentially
to the end of a VSAM file that has been opened with either OUTPUT
or EXTEND
.
Sequential files are always written sequentially.
For indexed files, you
must write new records in ascending key sequence. If you open the
file EXTEND
, the record keys of the records to be
added must be higher than the highest primary record key on the file
when you opened the file.
For relative files, the records must
be in sequence. If you include a RELATIVE KEY
data
item in the SELECT
clause, the relative record number
of the record to be written is placed in that data item.
Adding
records randomly or dynamically: When you write records to an
indexed data set and ACCESS IS RANDOM
or ACCESS
IS DYNAMIC
, you can write the records in any order.