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COBOL: File Handling

Audience

Students wishing to learn COBOL or to review particular divisions or components of COBOL

Prerequisites

The previous courses in the COBOL curriculum

Course Aim

To introduce students to COBOL's file handling concepts

Learning Objectives

Use file handling statements - OPEN, READ, CLOSE, and WRITE. Explain sequential file processing - updating sequential files, multiple transaction records, rewriting records. Explain relative file processing - organizing files, creating, reading, and updating relative files. Explain index file creation and processing - random updating, multiple transaction records, printing from an indexed file, and FILE STATUS. Explain the SORT feature, the INPUT and OUTPUT procedures, and the MERGE statement.

Topics Covered

File concepts - Organization and access modes - SELECT and ASSIGN - File processing statements Sequential files - Opening, creating, and updating - Reading and deleting - Master-transaction processing - Hands-on: Processing sequential files Indexed and relative files - Processing indexed files - Processing relative files - Hands-on: Creating a REWRITE clause SORT and MERGE - The SORT statement - The INPUT and OUTPUT procedures - The MERGE statement