Indexed READ statements transfer input data from external records
that have keyed access.
In an indexed file, a series of records can be read in key value
sequence by using an indexed READ statement and sequential READ
statements. The first record in the sequence is read by using the
indexed statement, the rest are read by using the sequential READ
statements.
An indexed READ statement can be formatted or unformatted, and takes
one of the following forms:
- Formatted:
- READ (eunit, format, key [, keyid] [, iostat] [, err]) [io-list]
- Unformatted:
- READ (eunit, key [, keyid] [, err]) [io-list]
- eunit
Is an external unit specifier ([UNIT=]io-unit).
- format
Is a format specifier ([FMT=]format).
- key
Is a key specifier (KEY[con]=value).
- keyid
Is a key-of-reference specifier (KEYID=kn).
- iostat
Is a status specifier (IOSTAT=i-var).
- err
Is a branch specifier (ERR=label) if an error condition occurs.
- io-list
Is an I/O list.
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