mysql 游标重新赋值

DELIMITER //

CREATE PROCEDURE process_data()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE v_id INT;
    DECLARE v_name VARCHAR(255);
    DECLARE cur CURSOR FOR SELECT id, name FROM users;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;

    OPEN cur;

    read_loop: LOOP
        FETCH cur INTO v_id, v_name;
        IF done THEN
            LEAVE read_loop;
        END IF;
        -- 处理数据
        SELECT v_id, v_name;
    END LOOP;

    CLOSE cur;

    -- 重新声明并打开游标
    DECLARE cur_new CURSOR FOR SELECT id, name FROM users WHERE status = 'active';
    OPEN cur_new;

    read_loop_new: LOOP
        FETCH cur_new INTO v_id, v_name;
        IF done THEN
            LEAVE read_loop_new;
        END IF;
        -- 处理新数据
        SELECT v_id, v_name;
    END LOOP;

    CLOSE cur_new;
END //

DELIMITER ;

CALL process_data();