dfindi - find first record using secondary index
#include
rno_t dfindi (buffer, fcb)
char *buffer;
DFILE *fcb;
Dfindi finds the first record that has field values greater than
or equal to the beginning field values placed in the data buffer.
If dnumidx(C-3) has been called prior
to this function, only the
first n fields of the current index are compared; otherwise, all
fields of the current index are compared. Any field values stored
in the data buffer that are not part of the current index are
ignored.
An RMSfile may have several secondary indexes associated with it.
These are used to retrieve records by other than the primary key
value. Before calling dfindi, call dseti(C-3)
to select the
desired secondary index. The selected secondary index has between
one and eight fields associated with it. The beginning values for
the secondary index fields desired must be stored in buffer
before calling dfindi.
Dfindi returns into the buffer the first record that contains
secondary field values greater than or equal to the field values
passed in buffer. Dfindi also saves the current position in the
secondary index, and additional records may be fetched in
secondary key order with the dfindni(C-3)
function.
Fcb is the file block pointer returned by dlopen(C-3)
or
dopen(C-3).
The returned record number may be saved and used on a subsequent
call to dread(C-3).
dlopen(C-3), dopen(C-3),
dseti(C-3), dnumidx(C-3),
dfindni(C-3), dread(C-3)
Chapter 4, RMS Programming Guide
Dfindi returns a value of BAD (-1) if an I/O error occurred, or
if there is no record that contains field values equal to or
greater than the beginning values passed in buffer. If no record
is found, the contents of buffer are undefined.