mysql按行循环

DELIMITER //

CREATE PROCEDURE ProcessRows()
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE v_id INT;
    DECLARE v_name VARCHAR(255);
    -- 声明游标
    DECLARE cur CURSOR FOR SELECT id, name FROM your_table;
    -- 声明结束标志
    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;
        -- 在这里对每一行数据进行处理
        -- 例如：更新操作
        UPDATE your_table SET status = 'processed' WHERE id = v_id;
    END LOOP;

    CLOSE cur;
END //

DELIMITER ;

-- 调用存储过程
CALL ProcessRows();