FIELDn=record,column,length,(TRIGGER=n,BASE={0|TRIGGER})
Options and values
- n
- The field parameter identifier. When adding a field parameter,
use the next available number, beginning with
1 .
- record
- The relative record number from the trigger on which the field
is based. This is the record number where the 390 indexer
begins to search for the field. The supported range of values are
+/−
0 to 255.
- column
- The relative column number from the BASE. This is the column number
where the 390 indexer begins to search for the field.
A value of
1 refers to the first byte in the record
where the carriage control characters reside. For those applications
that use a specific carriage-control character to define page boundaries
(for example, skip-to-channel one), consider defining the value of
the carriage-control character as one of the TRIGGER parameters. The
column value can be 1 to 32756.
- length
- The number of contiguous bytes (characters) that compose the field. The supported range of
values are
1 to 254. The field might be
partially or completely outside the record that was read. In this case, the 390 indexer uses
blanks for the data that was not in the record.
- TRIGGER=n
- Identifies the trigger parameter that the 390 indexer
uses to locate the field. Replace
n with the number
of a defined TRIGGER parameter.
- BASE={0|TRIGGER}
- Determines whether the 390 indexer uses the starting column
number of the trigger string value to locate the field data. Choose
from 0 or TRIGGER. If BASE=0, the indexer adds zero to the field column
offset. If BASE=TRIGGER, the indexer adds the starting column number
of the trigger string value to the field column offset. You should
use BASE=0 if the field data always starts in a specific column. You
should use BASE=TRIGGER if the field data doesn't always start in
a specific column, but is always offset from the trigger string value
a specific number of columns. For example, a trigger occurs in the
second record on a page. The trigger string value can begin in any
column in the record. A field base on this trigger occurs in the trigger
record. The starting column number of the field is always ten bytes
from the starting column number of the trigger. Specify BASE=TRIGGER
and a column offset of ten so that ACIF correctly locates the field,
regardless of the starting column of the trigger string value.
- Example
- The following field parameter causes the 390 indexer
to locate field values that begin in column
83 of
the same record that contains the TRIGGER1 string value. The field
length is eight bytes. We specify BASE=0 because the field data always
starts in the same column. TRIGGER1=*,1,X'F1',(TYPE=GROUP)
FIELD1=0,83,8,(TRIGGER=1,BASE=0)
The following field parameter
causes the indexer to locate field values that begin ten columns offset
from the trigger string value. The trigger string value can start
in any column in any record. Basing the field on TRIGGER2 and specifying
BASE=TRIGGER allows the indexer to locate the field by adding ten
to the starting column offset of the trigger string value. TRIGGER2=*,*,X'E2A482A396A38193',(TYPE=FLOAT)
FIELD2=0,10,12,(TRIGGER=2,BASE=TRIGGER)