My application makes use of multiple record types and REDEFINES. How does Acu4GL cope with this?
Acu4GL makes use of an XFD directive, the “WHEN” directive to manage multiple record types and REDEFINES clauses. You should be aware that this can lead to very “wide” tables and you may wish to consider restructuring any particularly complex tables for performance reasons. Back to top • XFD files are matched to tables through their names. My files use variable names; what can I do? Acu4GL provides an environment variable called XFD-MAP for this situation. As an example, the setting: XFD-MAP CUST*=CUSTOMER would mean that any table name beginning “CUST” would make use of the CUSTOMER.XFD file. See section 8.2 of the Acu4GL User’s Guide for more details on this variable. Back to top • Compare database access through Acu4GL and the use of Vision files. Accessing an RDBMS is likely to involve more overhead than simple ISAM access. It is reasonable to expect that the use of Vision files will be faster than an RDBMS in most circumstances. Exactly how great the difference will be for any giv
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- My application makes use of multiple record types and REDEFINES. How does Acu4GL cope with this?
