Question

我甚至无法在我的TRANSACTION中运行这个基本的CURSOR LOOP。

请帮忙。提前谢谢！

CREATE PROCEDURE ClearItems(IN itemName CHAR)
BEGIN
    DECLARE done INT DEFAULT FALSE;
    DECLARE bID INT(255);
    DECLARE bIDs CURSOR FOR SELECT id FROM table1 WHERE column1 = itemName AND column2 = 'b' ORDER BY column3 DESC, date ASC;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;
    START TRANSACTION;
        OPEN bIDs;
        clear_loop: LOOP
        FETCH bIDs INTO bID;
        IF done THEN
            LEAVE clear_loop;
            END IF;
        INSERT INTO table2 (column1) SELECT bID;
        END LOOP;
        CLOSE bIDs;
    COMMIT; 
END //
DELIMITER ;

Answer 1

解决问题 - 重命名声明的ID变量。字段名称和变量不应该相同。

另外，如果要填充另一个表，请尝试使用INSERT ... SELECT语句。它将帮助您避免使用游标。例如 -

INSERT INTO table2(`2column1`)
  SELECT id
    FROM table1
    WHERE `1column1` = itemName AND `1column2` = 'b'
    ORDER BY `1column3` DESC, date ASC;

TRANSACTION中的CURSOR循环

1 个答案: