These operations are optional for a Base-Table implementation.
base-table
: ordered-for-each-key handle procedure key-dimension column-types match-keys ¶Calls procedure once with each key in the table opened in handle which satisfy match-keys in the natural order for the types of the primary key fields of that table. An unspecified value is returned.
base-table
: make-nexter handle key-dimension column-types index ¶Returns a procedure of arguments key1 key2 … which returns the key-list identifying the lowest record higher than key1 key2 … which is stored in the base-table and which differs in column index or a lower indexed key; or false if no higher record is present.
base-table
: make-prever handle key-dimension column-types index ¶Returns a procedure of arguments key1 key2 … which returns the key-list identifying the highest record less than key1 key2 … which is stored in the base-table and which differs in column index or a lower indexed key; or false if no higher record is present.