Question

我创建了一个存储过程。在执行某些操作后，我想声明游标并从该游标获取数据。但是，它给出了语法错误。以下是我的存储过程

DELIMITER $$

USE `adserver`$$

DROP PROCEDURE IF EXISTS `getDaypartTimeDetail`$$

CREATE DEFINER=`root`@`localhost` PROCEDURE `getDaypartTimeDetail`(currentDate DATE,noOfdays INT,cityId BIGINT)
BEGIN
    DECLARE TotalFiles, TotalDuration BIGINT;
    DECLARE i INT;
    DECLARE da DATE;
    DECLARE dateCnt INT;


    SET dateCnt = 0;
    SET TotalFiles = 0;
    SET TotalDuration = 0;
    DROP TEMPORARY TABLE IF EXISTS tmp_date;
    DROP TEMPORARY TABLE IF EXISTS temp_data;

    CREATE TEMPORARY TABLE tmp_date(dday DATE); 
    CREATE TEMPORARY TABLE temp_data(dday DATE,daypartId INT,totalFile BIGINT,totalDur BIGINT); 

    WHILE(dateCnt < noOfdays) DO
        SET i = 1;
        INSERT INTO tmp_date(dday) VALUES (DATE_ADD(currentDate, INTERVAL dateCnt DAY));
    SET dateCnt = dateCnt + 1;
    END WHILE;

    DECLARE exit_flag INT DEFAULT 0; ****<-- Gives error**** 
    DECLARE dday DATE;
    DECLARE dId BIGINT;
    DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET exit_flag = 1;
    DECLARE cur CURSOR FOR SELECT dday, id FROM tmp_date, daypart;

    OPEN cur;
        all_details_id:LOOP
            FETCH cur INTO dday,dId;
            IF record_not_found THEN
                LEAVE all_details_id;
            END IF;
        INSERT INTO temp_data(dday,daypartId) VALUES (dday,dId);
        END LOOP all_details_id;
    CLOSE cur;

    SELECT * FROM temp_data;

END$$

DELIMITER ;

Answer 1

MySQL中存在（非常奇怪的）规则，即DECLARE语句应该在BEGIN SET之后的任何INSERT，DELIMITER $$ USE `adserver`$$ DROP PROCEDURE IF EXISTS `getDaypartTimeDetail`$$ CREATE DEFINER=`root`@`localhost` PROCEDURE `getDaypartTimeDetail`(currentDate DATE,noOfdays INT,cityId BIGINT) BEGIN DECLARE TotalFiles, TotalDuration BIGINT; DECLARE i INT; DECLARE da DATE; DECLARE dateCnt INT; DECLARE exit_flag INT DEFAULT 0; ****<-- Gives error**** DECLARE dday DATE; DECLARE dId BIGINT; DECLARE cur CURSOR FOR SELECT dday, id FROM tmp_date, daypart; DECLARE CONTINUE HANDLER FOR SQLSTATE '02000' SET exit_flag = 1; SET dateCnt = 0; SET TotalFiles = 0; SET TotalDuration = 0; DROP TEMPORARY TABLE IF EXISTS tmp_date; DROP TEMPORARY TABLE IF EXISTS temp_data; CREATE TEMPORARY TABLE tmp_date(dday DATE); CREATE TEMPORARY TABLE temp_data(dday DATE,daypartId INT,totalFile BIGINT,totalDur BIGINT); WHILE(dateCnt < noOfdays) DO SET i = 1; INSERT INTO tmp_date(dday) VALUES (DATE_ADD(currentDate, INTERVAL dateCnt DAY)); SET dateCnt = dateCnt + 1; END WHILE; OPEN cur; all_details_id:LOOP FETCH cur INTO dday,dId; IF record_not_found THEN LEAVE all_details_id; END IF; INSERT INTO temp_data(dday,daypartId) VALUES (dday,dId); END LOOP all_details_id; CLOSE cur; SELECT * FROM temp_data; END$$ DELIMITER ;等语句之前发生。请参阅此文http://rpbouman.blogspot.com/2005/10/nesting-mysql-cursor-loops.html

因此，您的脚本应如下所示：

{{1}}

希望这会有所帮助......

mysql：while循环后声明游标

1 个答案: