As you prepare to work with Database Connectors, you may find it helpful to understand the rules around filename interpretation and to understand how the names of tables and eXtended File Descriptor (XFD) files are formed and work together. For detailed information on XFDs, see XFDs.
When the compiler generates XFD files, it uses lowercase letters to name the XFD file. In addition, the compiler changes hyphens to underscores when naming the XFD file.
Through ACUFH configuration file variables, the run time system translates the name in the COBOL program into the filename that is passed to the open() function in the run time system. The open() function determines which file system to pass the request to, but does not change the name of the file.
Database Connectors translate the name to uppercase letters and changes hyphens to underscores. File extensions are stripped, based on the setting of 4GL_IGNORED_SUFFIX_LIST. This new name is the one that Database Connectors uses for references to database tables.