Question

我正在尝试在sql中执行一个过程但是我在日期参数方面遇到了一些麻烦

std::mutex::lock()

你看到p_datefrom和p_dateto是我在调用函数时要传递的参数：

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#

正如您所看到的，这是一个日期间隔。但是我得到了这个错误：

1064 - Erreur desyntaxeprèsde'ANDdate＆lt; = p_dateTo; ORDER BY date DESC; DECLARE CONTINUEHANDLER'àlaligne 53

你能帮我吗？

Answer 1

'date'是MySQL中的保留字。使用其他别名。

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

编辑：错误来自于你已经指出了spencer7593你有额外的分号这一事实。

event_param_X列被声明为varchar，但你正在使用算术运算（+ - ）。

Answer 2

有一些假的分号（语句终结符）。

  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
  ;

原始（错误）答案：

CONTINUE HANDLER必须遵循变量声明，但在游标声明之前需要。（我认为这在MySQL参考手册中有模糊的记录.MySQL存储的程序非常特别关于语句的顺序。）

~~要解决该错误，只需将DECLARE CONTINUE HANDLER语句移至第一个DECLARE CURSOR之前。~~

SQL过程参数

2 个答案: