dbQueryIsNull¶
Purpose¶
Returns 1 if the query is active, positioned on a valid record and the
field is NULL
; otherwise returns 0.
Reports whether the current field pointed at by an active query positioned on
a valid record is NULL
.
Format¶
-
ret =
dbQueryIsNull
(qid, field)¶ - Parameters:
qid (scalar) – query number.
field (scalar) – index into result set.
- Returns:
ret (scalar) – 1 if the field is
NULL
or 0 otherwise.
Remarks¶
Note that for some drivers, dbQueryIsNull()
will not return accurate
information until after an attempt is made to retrieve data.
See also
Functions dbQueryIsActive()
, dbQueryIsValid()