GetNextRowcursor

GetNextRowcursor is a function used in cursor-based data access to move an active cursor to the next row in a result set. It is found in database client libraries, data processing frameworks, and other systems that implement row-by-row iteration. The function advances the internal cursor pointer and typically returns the next row or a sentinel value indicating end of data.

Signature and return: The exact signature varies by implementation, but GetNextRowcursor usually accepts a handle or reference to an open cursor and returns either a row object, or null/undefined when no more rows remain. Some variants return a boolean success flag and require a separate call to retrieve the current row.

Usage: After opening and optionally applying initial fetch or filters, repeatedly call GetNextRowcursor(cur) to obtain successive rows until null/false is returned. Example: row = GetNextRowcursor(cur); while row is not null: process(row); row = GetNextRowcursor(cur);

Notes: If an error occurs, the function may raise an exception or return an error code. When the cursor is exhausted, subsequent calls typically return null or false. Cursor types differ in behavior regarding scrolling, concurrency, and transaction isolation. Performance considerations include the overhead of per-row calls versus batch or set-based retrieval, and the impact of cursor mode on locking and isolation levels.

See also: OpenCursor, CloseCursor, GetCurrentRow, ResetCursor, FetchNext, MoveNext.