mysql 光标切到最前面

DELIMITER //

CREATE PROCEDURE process_data()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE cur_id INT;
    DECLARE cur_name VARCHAR(255);
    DECLARE cur_cursor CURSOR FOR SELECT id, name FROM your_table;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur_cursor;

    -- 将光标切到最前面
    FETCH NEXT FROM cur_cursor INTO cur_id, cur_name;

    read_loop: LOOP
        IF done THEN
            LEAVE read_loop;
        END IF;

        -- 处理每一行数据
        -- 例如：UPDATE your_table SET status = 'processed' WHERE id = cur_id;

        FETCH NEXT FROM cur_cursor INTO cur_id, cur_name;
    END LOOP;

    CLOSE cur_cursor;
END //

DELIMITER ;

CALL process_data();