mySQL 存储过程没有给我错误消息

Question

以下存储过程按预期工作，但如果我强制发生错误(请参阅 INSERT 语句中的故意 type-o)，我不会收到任何错误信息。

我创建了一个名为 error_check 的表，并尝试在其中插入错误信息以查看是否可以获得更多信息，但是当出现错误时，不会向表中添加任何行。 (当我取出 type-o 时，正如预期的那样，我得到了一个包含空值的新行。)

这曾经有效，所以我确信这是我错误添加的。

CREATE DEFINER=`root`@`localhost` PROCEDURE `addClassToMasterList`( IN begin_date VARCHAR(10), IN day_num INT,
                               IN startTime VARCHAR(10), IN endTime VARCHAR (20), IN loc_id INT, IN studio VARCHAR(20),
                               IN class_name VARCHAR(45), IN owner_id INT,
                               IN club_id INT, OUT return_id VARCHAR(250))
BEGIN

DECLARE EXIT HANDLER FOR SQLEXCEPTION, NOT FOUND, SQLWARNING
BEGIN
    ROLLBACK;  
    GET DIAGNOSTICS CONDITION 1 @sqlstate = RETURNED_SQLSTATE, 
                                @errno = MYSQL_ERRNO, 
                                @text = MESSAGE_TEXT;
    SET @display_error = CONCAT("ERROR ", @errno, " (", @sqlstate, "): ", @text);
END;   /*end of exception handing*/

SET @formatted_date = STR_TO_DATE(begin_date, '%m/%d/%Y');

/* Save all data as a new row in the Master Schedule */
INSERT INTO master_class_list_typeo_here
VALUES (null, 
    day_num, 
    @formatted_date, 
    null,
    startTime, 
    endTime, 
    loc_id, 
    studio,
    class_name, 
    owner_id, 
    club_id); 

SELECT LAST_INSERT_ID() INTO @new_id;

/* Put bits of error into a table so I can see what is going on. */
INSERT INTO error_check
VALUES (null, @display_error, @text, @errno);

/* If an error message was generated, return the error.
   Otherwise, return the new id that was automatically created. */
SELECT IF (@display_error, @display_error, @new_id) INTO return_id;
/* Also tried:  SELECT @display_error INTO return_id;  */

END

Answer 1

尝试:

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GET STACKED DIAGNOSTICS CONDITION 1
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13.6.7.3 GET DIAGNOSTICS Syntax

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The keyword STACKED means to retrieve information from the second diagnostics area, which is available only if the current context is a condition handler.

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参见db-fiddle .