file extension DBF

File extension DBF description:

Database files (DBF files) are binary files containing typed, variable length records. Many SIBO applications (for example, the MC Diary and the Series 3 Database) store their data in DBF files. The data files created and manipulated by OPL are also examples of DBF files.

Database files are designed to be Flash-friendly, that is, they may be stored and manipulated in Flash SSDs (or any other EPROM medium). A DBF file stored on such a medium may be modified by appending, deleting, or replacing records without having to make a new copy of the entire file.

The chapter Database Files in the PLIB Reference manual describes DBF files from the point of view of reading and writing them using PLIB function calls such as DbfOpen, DbfAppend, DbfFindRead, and DbfNextRead. The ISAM Manual discusses more advanced techniques for using DBF files, in conjunction with independent keyed index files. The present chapter focuses instead upon a description allowing access to DBF files independently of these specialised PLIB and ISAM functions.

First, the basic structure of a general DBF file is reviewed, and then particular examples are given of how various SIBO applications use DBF files. This information should assist the creation of file format conversion programs such as might run on another computer, for example converting between Series 3 Agenda files and files that can be read directly by PC-based PIMs (Personal Information Managers).