Retrieves a string representation of the data in the current row in column.
Any type may be converted to a string. If the value is not bound (See [method@SparqlCursor.is_bound]) this method will return null.
| this |
a `TrackerSparqlCursor` |
| column |
column number to retrieve (first one is 0) |
| length |
length of the returned string, or null |
|
a string which must not be freed. null is returned if the column is not in the `[0, n_columns]` range, or if the row/column refer to a nullable optional value in the result set. |