CONTENTS

SYNOPSIS

DESCRIPTION

The record number data structure is either variable or fixed-length records stored in a flat-file format, accessed by the logical record number. The existence of record number five implies the existence of records one through four, and the deletion of record number one causes record number five to be renumbered to record number four, as well as the cursor, if positioned after record number one, to shift down one record.

The recno access method specific data structure provided to dbopen is defined in the
.In db.h include file as follows:
typedef struct {
u_long flags;
u_int cachesize;
u_int psize;
int lorder;
size_t reclen;
u_char bval;
char *bfname;
} RECNOINFO;

The elements of this structure are defined as follows:

The data part of the key/data pair used by the recno access method is the same as other access methods. The key is different. The data field of the key should be a pointer to a memory location of type recno_t, as defined in the
.In db.h include file. This type is normally the largest unsigned integral type available to the implementation. The size field of the key should be the size of that type.

Because there can be no meta-data associated with the underlying recno access method files, any changes made to the default values (e.g. fixed record length or byte separator value) must be explicitly specified each time the file is opened.

SEE ALSO

BUGS