Question

我在MySQL中创建了以下存储过程：

BEGIN
DECLARE temp_mold VARCHAR(30);
DECLARE temp_time DATETIME;
DECLARE temp_shot_ct INT;
DECLARE temp_shot_count INT;
DECLARE temp_shot_mold VARCHAR(30);
DECLARE temp_shot_cavity_count INT;
DECLARE temp_job_count INT;
DECLARE temp_row_count INT;
DECLARE done INT DEFAULT 0;
DECLARE temp_shot_counter INT DEFAULT 1;
DECLARE setup_time INT;
DECLARE cursor1 CURSOR FOR 
    SELECT 
        (schedule_run_time*3600)/(schedule_qty/schedule_cavity_count) as shot_ct, 
        ROUND((schedule_qty/schedule_cavity_count)) as shot_count, 
        schedule_mold as shot_mold, schedule_cavity_count as shot_cavity_count 
    FROM `schedule` 
    WHERE `schedule`.schedule_cell = start_cell AND `schedule`.schedule_date = DATE(start_time) AND deleted = 0
    ORDER BY schedule_order ASC;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;    

SELECT COUNT(schedule_id) INTO temp_job_count FROM `schedule` WHERE schedule_cell = start_cell AND schedule_date = DATE(start_time) AND deleted = 0;
SELECT cell_setup_standard INTO setup_time FROM cells WHERE cell_name = start_cell;

DROP TEMPORARY TABLE IF EXISTS rst;
CREATE TEMPORARY TABLE rst (
shot_id INT NOT NULL AUTO_INCREMENT,
shot_datetime datetime,
shot_qty INT,
PRIMARY KEY (shot_id)
);

SET temp_time = start_time;
SET temp_mold = "";
SET temp_row_count = 0;

INSERT INTO rst (shot_datetime) VALUES (temp_time);

#Loop through cursor1 recordset
OPEN cursor1;
    start_loop: LOOP
        FETCH cursor1 INTO temp_shot_ct, temp_shot_count, temp_shot_mold, temp_shot_cavity_count;
        IF done THEN
            LEAVE start_loop;
        END IF;
        IF temp_mold <> temp_shot_mold THEN 
            SET temp_time = TIMESTAMPADD(MINUTE,setup_time,temp_time); #Add standard setup time whenever the mold changes
            INSERT INTO rst (shot_datetime) VALUES (temp_time);
            SET temp_mold = temp_shot_mold;
        END IF;

        SET temp_shot_counter = 1;
        REPEAT
            SET temp_time = TIMESTAMPADD(SECOND,temp_shot_ct,temp_time);
            INSERT INTO rst (shot_datetime,shot_qty) VALUES (temp_time,temp_shot_cavity_count);
            SET temp_shot_counter = temp_shot_counter + 1;
        UNTIL temp_shot_counter > temp_shot_count
        END REPEAT;
    END LOOP;
CLOSE cursor1;

#Return records.  Will be used in ORM to loop through records on the PHP side
SELECT SUM(shot_qty) AS qty, HOUR(shot_datetime) AS shot_hour FROM rst GROUP BY HOUR(shot_datetime);
DROP TEMPORARY TABLE IF EXISTS rst;
END

我不是最擅长使用存储过程的人。这个运行速度非常慢 - 运行大约需要6秒钟。查询分别以毫秒为单位运行，因此我预计这最多需要100毫秒。我无法弄清楚我做错了什么导致它运行得这么慢。有没有人对如何更快地运行有任何想法？我可以创建一个PHP脚本来做同样的事情，但我正试图在MySQL中使用存储过程和函数变得更好 - 这远远少于代码。我欢迎任何建议。

MySQL存储过程运行缓慢

0 个答案: