A split control field is formed when you assign more than one field in an input record the same control level indicator. For a program described file, the fields that have the same control level indicator are combined by the program in the order specified in the input specifications and treated as a single control field (see Figure 18). The first field defined is placed in the high-order (leftmost) position of the control field, and the last field defined is placed in the low-order (rightmost) position of the control field.
*...1....+....2....+....3....+....4....+....5....+....6....+....7...
IFilename++SqNORiPos1+NCCPos2+NCCPos3+NCC................................
I........................Fmt+SPFrom+To+++DcField+++++++++L1M1FrPlMnZr....
IMASTER 01
I 28 31 CUSNO L4
I 15 20 ACCTNO L4
I 50 52 REGNO L4
For an externally described file, fields that have the same control level indicator are combined in the order in which the fields are described in the data description specifications (DDS), not in the order in which the fields are specified on the input specifications. For example, if these fields are specified in DDS in the following order:
and if these fields are specified with the same control level indicator in the following order on the input specifications:
the fields are combined in the following order to form a split control field: EMPNO DPTNO REGNO.
Some special rules for split control fields are:
Figure 19 shows examples of the preceding rules.
*...1....+....2....+....3....+....4....+....5....+....6....+....7...
IFilename++SqNORiPos1+NCCPos2+NCCPos3+NCC................................
I........................Fmt+SPFrom+To+++DcField+++++++++L1M1FrPlMnZr....
IDISK BC 91 95 C1
I OR 92 95 C2
I OR 93 95 C3
I
* All portions of the split control field must be assigned the same
* control level indicator and all must have the same field record
* relation entry.
I 1 5 FLD1A L1
I 46 50 FLD1B L1
I 11 13 FLDA L2
I 51 60 FLD2A L3
I 31 40 FLD2B L3
I 71 75 FLD3A L4 92
I 26 27 FLD3B L4 92
I 41 45 FLD3C L4 92
I 61 70 FLDB 92
I 21 25 FLDC 92
I 6 10 FLD3D L4 93
I 14 20 FLD3E L4 93
The record identified by a '1' in position 95 has two split control fields:
The record identified with a '2' in position 95 has three split control fields:
The third record type, identified by the 3 in position 95, also has three split control fields: