5.1 Data Division Overview
This overview describes the structure of the Data Division for programs,
X classes, and methods. Each section in the Data Division has a specific
X logical function within a COBOL source program or method and can be omitted when that logical function is not needed. If included, the sections must be written in the order shown. The Data Division is optional.
- Program Data Division
-
The Data Division of a COBOL source program describes, in a structured
manner, all the data to be processed by the object program.
-
X Class Data Division -
X The Class Data Division section contains data description entries for
X object-instance data. The Class Data Division contains only the
X Working-Storage Section. -
X Method Data Division -
X A method has two visible Data Divisions: the Class Data Division and
X the Method Data Division. If the same data-name is used in both the
X Class Data Division and the Method Data Division, when a method
X references the data-name, the data-name in the Method Data Division
X takes precedence.
___ Format--Program and Method Data Division ______________________________________________
| |
| >>__DATA DIVISION.________________________________________________________________________> |
| |
| >__ _____________________________________________________________________________ ________> |
| | <__________________________________________________________ | |
| |_FILE SECTION.____ ______________________________________________________ _|_| |
| | <__________________________ | |
| |_file-description-entry____record-description-entry_|_| |
| |
| >__ _______________________________________________________________ ______________________> |
| | <_________________________________ | |
| |_WORKING-STORAGE SECTION.____ _____________________________ _|_| |
| |_record-description-entry____| |
| |_data-item-description-entry_| |
| |
| >__ _________________________________________________________________ ____________________> |
| | <___________________________________ | |
| |_ LOCAL-STORAGE SECTION. ____ _______________________________ _|_| |
| |_ record-description-entry ____| |
| |_ data-item-description-entry _| |
| |
| >__ _______________________________________________________ _____________________________>< |
| | <_________________________________ | |
| |_LINKAGE SECTION.____ _____________________________ _|_| |
| |_record-description-entry____| |
| |_data-item-description-entry_| |
| |
|_____________________________________________________________________________________________|
X ___ Format--Class Data Division _____________________________________________ X | | X | >>__ _________________________________________________________________ ___>< | X | | <_________________________________ | | X | |__WORKING-STORAGE SECTION.____ _____________________________ _|__| | X | |_record-description-entry____| | X | |_data-item-description-entry_| | | | |______________________________________________________________________________|
Subtopics:
- 5.1.1 File Section
- 5.1.2 Working-Storage Section
- 5.1.3 Local-Storage Section
- 5.1.4 Linkage Section
- 5.1.5 Data Types
- 5.1.6 Data Relationships
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