back
Summary
#include <dataman/dataman.h>
back(index_name) else ...
char *index_name;
Description
int db_bck(index_name)
This procedure flushes the current record to disk and
retrieves the data record preceding it to memory. The
string index_name is the name of the index that points to
the file that the user wants to back up, or the manifest
constant WFILE. The function back is not to be confused
with the get_prior function. The index refers to its
MFRP, then checks if there is a record preceding this in
the data base file. If not, the current record is not
flushed, and the else clause is executed. If there is a
previous record, the current one is flushed, the MFRP is
decremented, and the new current record is read into
memory. If the index has no current record (i.e. a GET
has not occurred) the diagnostic 'Initial GET not
attempted' will display and the routine will terminate.
If idx_name is the manifest constant WFILE the operation
will affect the work file.
Example
#include <dataman/dataman.h>
main(argc,argv)
int argc;
char **argv;
{
key k_buff;
....
get(idx1,k_buff) else {
pause(10,10,"Can't find key");
exit(0);
}
while (MFMT == 3) {
back(idx1) else /* keep backing */
break; /* first of file */
... /* process record */
}
}
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