Sets the scrollable cursor mode for subsequent fetches.
result_id
result_id is a valid result id (select
type queries only, and only if a "scrollable" cursor was
requested when calling sesam_query()).
whence
whence sets the global default value for the
scrolling type, it specifies the scroll type to use in subsequent
fetch operations on "scrollable" cursors, which can be set to the
following predefined constants:
Table 1. Valid values for whence
| Value | Constant | Meaning |
|---|---|---|
| 0 | SESAM_SEEK_NEXT | read sequentially |
| 1 | SESAM_SEEK_PRIOR | read sequentially backwards |
| 2 | SESAM_SEEK_FIRST | fetch first row (after fetch, the default is set to SESAM_SEEK_NEXT) |
| 3 | SESAM_SEEK_LAST | fetch last row (after fetch, the default is set to SESAM_SEEK_PRIOR) |
| 4 | SESAM_SEEK_ABSOLUTE |
fetch absolute row number given as
offset (Zero-based. After fetch, the
default is set to SESAM_SEEK_ABSOLUTE,
and the offset value is auto-incremented)
|
| 5 | SESAM_SEEK_RELATIVE |
fetch relative to current scroll position, where
offset can be a positive or negative
offset value (this also sets the default "offset" value for
subsequent fetches).
|
offset
An optional parameter which is only evaluated (and required) if
whence is either
SESAM_SEEK_RELATIVE or
SESAM_SEEK_ABSOLUTE.