unullify
Updates the fields appearing in the ‘if’ list to NULL in the general I/O buffer.
void
unullify
(uc, ch)
struct uctrl
*uc;
int
ch;
Parameters
- uc—address of the current control block.
- ch—no longer used.
Return Values
Not applicable.
Description
Updates the fields appearing in the ‘if’ list to NULL in the general I/O buffer.
unullify
is
available to nullify the foreign key fields in the Wildcard mode
1 connector request and is only available
in the Wildcard mode 1 connector request.
This example implements the request available to nullify the foreign key fields in the Wildcard mode 1 connector request.
The following function is called in the example:
UpdateRecord
—update the record described by the current control block.
PerformNullify( struct uctrl *ControlBlock ) { short Hitfound = 0; unsigned char *PRABuffer; ... /* Find record */ ... Hitfound = uhitchk ( ControlBlock, 0, PRABuffer ); if ( HitFound ) { unullify ( ControlBlock, 0 );/*Now update the record with*/ /*the changed general I/O */ /*buffer*/ } ... }