SQL 程序参数

Question

我正在尝试在 sql 中执行一个过程，但我在日期参数方面遇到了一些问题

DELIMITER #
CREATE PROCEDURE conso(IN p_upcNameId VARCHAR(20), IN p_dateFrom DATE, IN p_dateTo DATE)     
BEGIN
    DECLARE done int default false;

    DECLARE v_cumule FLOAT;

    DECLARE v_reserve VARCHAR(40);
    DECLARE v_kg VARCHAR(40);
    DECLARE v_date DATETIME;

    DECLARE v_reserve_1 VARCHAR(40);
    DECLARE v_kg_1 VARCHAR(40);
    DECLARE v_date_1 DATETIME;

    DECLARE cur1 CURSOR FOR
        SELECT reserve, kg, date
        FROM
        (
            ( SELECT event_param_3 as reserve, event_param_4 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 50 ORDER BY event_datetime DESC )
            UNION
            ( SELECT event_param_2 as reserve, event_param_3 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 54 ORDER BY event_datetime DESC )

            UNION
            ( SELECT event_param_2 as reserve, event_param_3 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 52 ORDER BY event_datetime DESC )
            UNION
            ( SELECT event_param_1 as reserve, event_param_2 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 56 ORDER BY event_datetime DESC )

            UNION
            ( SELECT event_param_2 as reserve, event_param_3 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 53 ORDER BY event_datetime DESC )
            UNION
            ( SELECT event_param_1 as reserve, event_param_2 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 57 ORDER BY event_datetime DESC )
        ) as diffusion_programs
        ORDER BY date DESC;
    DECLARE cur2 CURSOR FOR
        SELECT reserve, kg, date
        FROM
        (
            ( SELECT event_param_3 as reserve, event_param_4 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 50 ORDER BY event_datetime DESC )
            UNION
            ( SELECT event_param_2 as reserve, event_param_3 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 54 ORDER BY event_datetime DESC )

            UNION
            ( SELECT event_param_2 as reserve, event_param_3 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 52 ORDER BY event_datetime DESC )
            UNION
            ( SELECT event_param_1 as reserve, event_param_2 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 56 ORDER BY event_datetime DESC )

            UNION
            ( SELECT event_param_2 as reserve, event_param_3 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 53 ORDER BY event_datetime DESC )
            UNION
            ( SELECT event_param_1 as reserve, event_param_2 as kg, event_datetime as date FROM events WHERE upcNameId = p_upcNameId AND event_code = 57 ORDER BY event_datetime DESC )
        ) as diffusion_programs
        WHERE date >= p_dateFrom;
        AND date <= p_dateTo;
        ORDER BY date DESC;
    DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = 1;
    OPEN cur1;
    OPEN cur2;

    /* Create temporary table */
    CREATE TEMPORARY TABLE tmp
    (
        date DATE,
        kg FLOAT
    );
    SET v_cumule = 0;
    FETCH cur2 INTO v_reserve_1, v_kg_1, v_date_1;

    forLoop: LOOP
        /* Actual row */
        FETCH cur1 INTO v_reserve, v_kg, v_date;

        /* Next row */
        FETCH cur2 INTO v_reserve_1, v_kg_1, v_date_1;

        /* Reserves differents TODO */
        /*IF v_reserve != v_reserve_1
        END IF;*/

        IF DATE(v_date) = DATE(v_date_1) THEN SET v_cumule = v_cumule + (v_kg_1 - v_kg);
        ELSE
            INSERT INTO tmp VALUES (DATE(v_date), v_cumule);
            SET v_cumule = 0;
        END IF;

        IF done THEN LEAVE forLoop;
        END IF;
    END LOOP;

    CLOSE cur1;
    CLOSE cur2;
END#

你看 p_datefrom 和 p_dateto 是我调用函数时想要传递的一些参数 :

DELIMITER ;
CALL conso('Name','2017-01-01','2018-01-01');
SELECT * FROM tmp;

如您所见，这是一个日期区间。但我收到此错误：

1064 - AND date <= p_dateTo 语法错误；按日期排序； DECLARE CONTINUE HANDLER' à la ligne 53

你能帮帮我吗？

Answer 1

'date'是MySQL中的保留字。使用另一个别名。

此外，您应该考虑使用 CASE 语句来摆脱多个 UNION 语句（您可以在一个查询中创建所有 UNION）。

编辑：正如 spencer7593 已经指出的那样，错误来自于您有额外的分号这一事实。

event_param_X 列声明为 varchar，但您正在对这些列进行算术运算 (+-)。

Answer 2

有一些虚假的分号（语句终止符）。

  WHERE date >= p_dateFrom;
       AND date <= p_dateTo;
       ORDER BY date DESC;

删除那些

  WHERE date >= p_dateFrom
       AND date <= p_dateTo
       ORDER BY date DESC
  ;

原（错误）答案:

~~CONTINUE HANDLER必须跟在变量声明之后，但需要在游标声明之前。（我认为这在 MySQL 参考手册中有模糊的记录。MySQL 存储程序对语句的顺序非常讲究。）~~

~~要修复该错误，只需将 DECLARE CONTINUE HANDLER 语句移到第一个 DECLARE CURSOR 之前。~~

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