MySQL 8.4 C API Developer Guide
MYSQL_ROW_OFFSET mysql_stmt_row_tell(MYSQL_STMT *stmt)
          Returns the current position of the row cursor for the last
          mysql_stmt_fetch(). This value
          can be used as an argument to
          mysql_stmt_row_seek().
        
          You should use
          mysql_stmt_row_tell() only
          after
          mysql_stmt_store_result().