RPG (Report Program Generator) provides comprehensive support for file handling and database access. It offers techniques and commands that enable developers to interact with files and databases efficiently. Let's explore how RPG handles file handling and database access:
File Handling:
RPG provides several file handling techniques that allow reading, writing, updating, and deleting records in both physical and logical files. The key concepts and commands involved in file handling are:
1. File Specifications:
RPG programs start with file specifications that define the files being used and their characteristics. The file specifications specify the file layout, organization, access method, record format, and other relevant attributes.
2. Input and Output Operations:
RPG supports various input and output operations for file handling:
* READ: The READ operation retrieves a record from a file into specified data fields in the program.
* WRITE: The WRITE operation adds a new record to a file or updates an existing record.
* UPDATE: The UPDATE....
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