How to Put a Null Value in a Field

ID: Q128201

3.00 WINDOWS kbprg

The information in this article applies to:

Microsoft Visual FoxPro for Windows, version 3.0
Microsoft Visual FoxPro for Macintosh, version 3.0

SUMMARY

There are several methods you can use to place a .NULL. value in a field at the language level. However, there is only one pre-designated method for adding .NULL. to fields through the interface.

MORE INFORMATION

The only predefined method for adding .NULL. to a field manually is by using the CTRL+0 (control+zero) key combination. The zero key must be the zero key on the main keyboard, not the zero key on the numeric keypad. In Visual FoxPro for Macintosh, you must use the zero on the numeric keypad. The zero on the main keypad does not work.

If you'd prefer to use another key combination, use the ON KEY LABEL command. For Example, you could use the following command when interacting with a BROWSE:

   ON KEY LABEL F12 DO ADD_NULL

After creating a procedure or program called ADD_NULL that contains this code:

   ON KEY LABEL F12                && Temporarily turn off routine.
   REPLACE (SYS(18)) WITH .NULL.   && Replace current field with .NULL.
   ON KEY LABEL F12 DO ADD_NULL    && Turn On Key Label back on.

Additional reference words: 3.00 VFoxWin KBCategory: kbprg KBSubcategory: FxprgGeneral

Keywords          : FxprgGeneral 
Version           : 3.00
Platform          : WINDOWS