MYSQL 语法错误，意外的 while_sym，期待 END_OF_INPUT 或 ';'

Question

我正在尝试创建一个存档事件，我想出的结果如下所示:

SET @Date = NULL;
SET @SEDOL = NULL;
CREATE EVENT IF NOT EXISTS Archive_Event
ON SCHEDULE EVERY 1 DAY
DO
SELECT @Date = Date,@SEDOL = SEDOL
from daily.analytics
where   Date =  (SELECT MIN(Date)
                 from daily.analytics 
                 WHERE Date < date_sub(NOW(), INTERVAL 21 DAY))
order by SEDOL desc limit 1

WHILE @date is not null
begin
    begin transaction
    -- Adds old line to archive
    insert into daily.Archive_analytics
        select * from daily.analytics where Date = @Date AND SEDOL = @SEDOL
    -- Deletes old line from main table
    delete from daily.analytics where Date = @Date AND SEDOL = @SEDOL
    commit transaction
    -- Find the next greater minimum value
    SELECT @Date = Date,@SEDOL = SEDOL
    from daily.analytics
    where   Date =  (SELECT MIN(Date)
                     from daily.analytics 
                     WHERE Date < date_sub(NOW(), INTERVAL 21 DAY))
     order by SEDOL desc
     limit 1
END WHILE
END

在网上搜索这似乎或多或少是正确的，但是我的 WHILE 语句出现“语法错误，意外的 while_sym，期待 END_OF_INPUT 或‘;’”，我不太清楚为什么。

非常感谢任何帮助。

Answer 1

原来问题是由于分隔符和代码中的多个 block 引起的。没有语法错误的版本如下所示:

SET @Date = NULL;
SET @SEDOL = NULL;

delimiter |
CREATE EVENT IF NOT EXISTS daily.Archive_Event_HOUR
ON SCHEDULE EVERY 1 DAY
DO
    begin
    SELECT @Date = Date,@SEDOL = SEDOL
    from daily.analytics
    where   Date =  (SELECT MIN(Date)
                     from daily.analytics 
                     WHERE Date < date_sub(NOW(), INTERVAL 21 DAY))
    order by SEDOL desc limit 1;

    WHILE @Date is not null DO
        start transaction;
        -- Adds old line to archive
        insert into daily.Archive_analytics
            select * from daily.analytics where Date = @Date AND SEDOL = @SEDOL;
        -- Deletes old line from main table
        delete from daily.analytics where Date = @Date AND SEDOL = @SEDOL;
        commit;
        -- Find the next greater minimum value
        SELECT @Date = Date,@SEDOL = SEDOL
        from daily.analytics
        where   Date =  (SELECT MIN(Date)
                         from daily.analytics 
                         WHERE Date < date_sub(NOW(), INTERVAL 21 DAY))
         order by SEDOL desc
         limit 1;
    END WHILE;
END|
delimiter ;