mysql - 无法导入 MYSQL 函数 - 错误 1064 (42000)

Question

我试图理解为什么以下内容失败但我看不到它。我们的开发服务器上的 phpMyAdmin 准确地生成了这个，但是当我尝试导入它时 - 我遇到了一个奇怪的解析(？)错误。

mysql> DELIMITER $$
mysql>
mysql> --
mysql> -- Functions
mysql> --
mysql> DROP FUNCTION IF EXISTS `get_class_nextsession`$$
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> CREATE DEFINER=`myusername`@`localhost` FUNCTION `get_class_nextsession`(class_id INT) RETURNS datetime
    ->     READS SQL DATA
    -> BEGIN
    -> DECLARE nextsession,startdate,runningdate,enddate DATETIME;
    -> SET nextsession= '-';
    -> SELECT  MIN(CS.start_datetime) INTO startdate FROM site_class_schedule AS CS INNER JOIN site_class AS C ON (C.id=CS.class_id) WHERE CS.class_id=class_id Group by C.id Limit 0,1;
    -> IF startdate >= NOW() THEN
    -> RETURN startdate;
    -> ELSE
    -> SELECT  CS.start_datetime INTO runningdate FROM site_class_schedule AS CS INNER JOIN site_class AS C ON (C.id=CS.class_id) WHERE CS.class_id=class_id and (NOW() between start_datetime and end_datetime ) Limit 0,1;
    -> IF runningdate IS NOT NULL THEN
    -> RETURN runningdate;
    -> ELSE
    -> SELECT  MAX(CS.end_datetime) INTO enddate FROM site_class_schedule AS CS INNER JOIN site_class AS C ON (C.id=CS.class_id) WHERE CS.class_id=class_id Group by C.id Limit 0,1;
    -> IF enddate < NOW() THEN
    -> RETURN enddate;
    -> ELSEIF enddate >= NOW() THEN
    -> SELECT  MIN(CS.start_datetime) INTO startdate FROM site_class_schedule AS CS INNER JOIN site_class AS C ON (C.id=CS.class_id) WHERE CS.class_id=class_id and CS.start_datetime > NOW() Group by C.id Limit 0,1;
    ->
Display all 1866 possibilities? (y or n)
    ->  startdate;
    ->
Display all 1866 possibilities? (y or n)
    -> D IF;
    -> END IF;
    -> END IF;
    -> RETURN nextsession;
    -> END$$
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ';
D IF;
END IF;
END IF;
RETURN nextsession;
END' at line 19
mysql>
mysql>

<小时/>

进度更新1

这有效

mysql> DELIMITER $$
mysql>
mysql> DROP FUNCTION IF EXISTS `get_class_nextsession`$$
Query OK, 0 rows affected, 1 warning (0.00 sec)

mysql> CREATE DEFINER=`myusername`@`localhost` FUNCTION `get_class_nextsession`(class_id INT) RETURNS datetime
    ->     READS SQL DATA
    -> BEGIN
    -> RETURN nextsession;
    -> END$$
Query OK, 0 rows affected (0.00 sec)

这有效

mysql>
mysql> DROP FUNCTION IF EXISTS `get_class_nextsession`$$
Query OK, 0 rows affected (0.00 sec)

mysql>
mysql> CREATE DEFINER=`myusername`@`localhost` FUNCTION `get_class_nextsession`(class_id INT) RETURNS datetime
    ->     READS SQL DATA
    -> BEGIN
    -> DECLARE nextsession,startdate,runningdate,enddate DATETIME;
    -> RETURN nextsession;
    -> END$$
Query OK, 0 rows affected (0.00 sec)

这不起作用 - 请注意我如何尝试将查询/语句简化为基本查询/语句。

mysql> DROP FUNCTION IF EXISTS `get_class_nextsession`$$
Query OK, 0 rows affected, 1 warning (0.01 sec)

mysql> CREATE DEFINER=`myusername`@`localhost` FUNCTION `get_class_nextsession`(class_id INT) RETURNS datetime
    ->     READS SQL DATA
    -> BEGIN
    -> DECLARE nextsession,startdate,runningdate,enddate DATETIME;
    -> SET nextsession= '-';
    -> SELECT  MIN(start_datetime) INTO startdate FROM site_class_schedule;
    -> IF startdate >= NOW() THEN
    -> RETURN startdate;
    -> ELSE
    -> END IF;
    -> RETURN nextsession;
    -> END$$
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'END IF;
RETURN nextsession;
END' at line 10

Answer 1

啊哈!

这绝对是一个“不寻常”的错误，其中“没有任何”错误!我面临的问题是由于在原始函数创建中生成或放置了过多的选项卡!两个连续的\t 破坏了 mysql 提示符上的数据输入流并让 mysql 询问

 Display all 1866 possibilities? (y or n)

此外，当我在 SO 上复制粘贴时，我粘贴的是与 MYSQL 命令提示符交互的最终输出，而不是我实际放置在那里的内容!

DROP FUNCTION IF EXISTS `get_class_nextsession`$$
CREATE DEFINER=`myusername`@`localhost` FUNCTION `get_class_nextsession`(class_id INT) RETURNS datetime
    READS SQL DATA
BEGIN
DECLARE nextsession,startdate,runningdate,enddate DATETIME;
SET nextsession= '-';
SELECT  MIN(CS.start_datetime) INTO startdate FROM site_class_schedule AS CS INNER JOIN site_class AS C ON (C.id=CS.class_id) WHERE CS.class_id=class_id Group by C.id Limit 0,1;
IF startdate >= NOW() THEN
RETURN startdate;
ELSE    
SELECT  CS.start_datetime INTO runningdate FROM site_class_schedule AS CS INNER JOIN site_class AS C ON (C.id=CS.class_id) WHERE CS.class_id=class_id and (NOW() between start_datetime and end_datetime ) Limit 0,1;
IF runningdate IS NOT NULL THEN
RETURN runningdate;
ELSE
SELECT  MAX(CS.end_datetime) INTO enddate FROM site_class_schedule AS CS INNER JOIN site_class AS C ON (C.id=CS.class_id) WHERE CS.class_id=class_id Group by C.id Limit 0,1;
IF enddate < NOW() THEN
    RETURN enddate;
ELSEIF enddate >= NOW() THEN
SELECT  MIN(CS.start_datetime) INTO startdate FROM site_class_schedule AS CS INNER JOIN site_class AS C ON (C.id=CS.class_id) WHERE CS.class_id=class_id and CS.start_datetime > NOW() Group by C.id Limit 0,1;
            RETURN startdate; ****ISSUE WITH MORE THAN 2 TABS****
        END IF; ****ISSUE WITH MORE THAN 2 TABS****
    END IF;
END IF;
RETURN nextsession;
END$$