MYSQL存儲過程：批量更新數據

地區等級的信息儲存在jsjh_district表。

要更新jsjh_goods_district表的district_level地區信息

DELIMITER $$ 
DROP PROCEDURE IF EXISTS update_district_level $$
CREATE PROCEDURE update_district_level()
BEGIN
DECLARE row_id INT;#定義變量ID
DECLARE row_district_id INT;#定義變量地區ID
DECLARE row_level INT;#定義變量地區等級
DECLARE done INT;
-- 定義游標
DECLARE rs_cursor CURSOR FOR
SELECT main.id,main.district_id,d.`level` FROM jsjh_goods_district main LEFT JOIN jsjh_district d ON d.id=main.district_id;
DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1;
OPEN rs_cursor; 
cursor_loop:LOOP
FETCH rs_cursor INTO row_id,row_district_id,row_level; -- 取數據
IF done=1 THEN
leave cursor_loop;
END IF;
-- 更新表
UPDATE jsjh_goods_district SET district_level=row_level WHERE id=row_id;
END LOOP cursor_loop;
CLOSE rs_cursor;
END$$
DELIMITER ;

 執行存儲過程

CALL update_district_level();

/* Affected rows: 0  已找到記錄: 0  警告: 0  持續時間 1 query: 1.014 sec. */

執行時間1秒多