mysql存储过程打印错误信息并回滚

Question

我正在尝试编写一个存储过程，它将首先打印错误消息然后回滚

我试过了，但是这个不起作用

我可以回滚它，但如果出现错误，它不会打印错误消息

DELIMITER 

CREATE PROCEDURE transaction_sp ()

BEGIN

DECLARE exit handler for sqlexception
BEGIN
-- ERROR
-------------------------------------------------------------------------------------- 
select "error message '%s' and errorno '%d'"------- this part in not working
-------------------------------------------------------------------------------------- 
ROLLBACK;
END;

DECLARE exit handler for sqlwarning
BEGIN
-- WARNING
-------------------------------------------------------------------------------------- 
 select "warning message '%s' and errorno '%d'"------- this part in not working
-------------------------------------------------------------------------------------- 
ROLLBACK;
END;

START TRANSACTION;
-- ADD option 5
INSERT INTO product_option(product_id,option_id,required) VALUES(insertedProductID,5,0);
SET poid = (SELECT LAST_INSERT_ID());
INSERT INTO     product_option_value(product_option_id,product_id,option_id,option_value_id,quantity,subtract,price,pr ice_prefix,points,points_prefix,weight,weight_prefix)    VALUES(poid,insertedProductID,5,50,0,0,4.99,'+',0,'+',0,'+');

-- ADD option 12
INSERT INTO product_option(product_id,option_id,required) VALUES(insertedProductID,12,1);

-- ADD option 13
INSERT INTO product_option(product_id,option_id,required)       VALUES(insertedProductID,13,0);

COMMIT;
END
$$

那么我怎样才能用这个存储过程来实现它

Answer 1

这对我有用

DELIMITER 

CREATE PROCEDURE transaction_sp ()

BEGIN

DECLARE exit handler for sqlexception
BEGIN
-- ERROR
-------------------------------------------------------------------------------------- 
--select "error message '%s' and errorno '%d'"------- this part in not working
-------------------------------------------------------------------------------------- 
GET DIAGNOSTICS CONDITION 1
@p1 = RETURNED_SQLSTATE, @p2 = MESSAGE_TEXT;
SELECT @p1 as RETURNED_SQLSTATE  , @p2 as MESSAGE_TEXT;
ROLLBACK;
END;

DECLARE exit handler for sqlwarning
BEGIN
-- WARNING
-------------------------------------------------------------------------------------- 
-- select "warning message '%s' and errorno '%d'"------- this part in not working
-------------------------------------------------------------------------------------- 
GET DIAGNOSTICS CONDITION 1
@p1 = RETURNED_SQLSTATE, @p2 = MESSAGE_TEXT;
SELECT @p1 as RETURNED_SQLSTATE  , @p2 as MESSAGE_TEXT;
ROLLBACK;
END;

START TRANSACTION;
-- ADD option 5
INSERT INTO product_option(product_id,option_id,required) VALUES(insertedProductID,5,0);
SET poid = (SELECT LAST_INSERT_ID());
INSERT INTO     product_option_value(product_option_id,product_id,option_id,option_value_id,quantity,subtract,price,pr ice_prefix,points,points_prefix,weight,weight_prefix)    VALUES(poid,insertedProductID,5,50,0,0,4.99,'+',0,'+',0,'+');

-- ADD option 12
INSERT INTO product_option(product_id,option_id,required) VALUES(insertedProductID,12,1);

-- ADD option 13
INSERT INTO product_option(product_id,option_id,required)       VALUES(insertedProductID,13,0);

COMMIT;
END
$$

Answer 2

抱歉，我可能迟到了，但在您的询问中

BEGIN
-- ERROR
-------------------------------------------------------------------------------------- 
select "error message '%s' and errorno '%d'"------- this part in not working
-------------------------------------------------------------------------------------- 
ROLLBACK;
END;

改成

BEGIN
select "error message '%s' and errorno '%d'"; -- use missed the semicolon
ROLLBACK;
END;

因此它实际上会显示列名为“ROLLBACK”的错误消息，而不是打印和回滚事务。

Answer 3

这是我打印错误消息和回滚的方式：

CREATE PROCEDURE procedure_name() 
BEGIN
    DECLARE EXIT HANDLER FOR SQLEXCEPTION
    BEGIN
        SHOW ERRORS;  --this is the only one which you need
        ROLLBACK;   
    END; 
    START TRANSACTION;
        --query 1
        --query 2
        --query 3
    COMMIT;
END 

如果查询 1、2 或 3 将抛出错误，HANDLER 将捕获 SQLEXCEPTION 和 SHOW ERRORS 将为我们显示错误。注意：SHOW ERRORS 应该是 HANDLER 中的第一条语句。

Answer 4

某些版本的 MySQL 将 MESSAGE_TEXT 常量视为导致错误显示的列。这种方式非常适合我在 MySQL 8x 社区中的工作。

DECLARE EXIT HANDLER FOR SQLEXCEPTION
BEGIN
    GET DIAGNOSTICS CONDITION 1 @ERRNO = MYSQL_ERRNO, @MESSAGE_TEXT = MESSAGE_TEXT;
    SELECT 'ERROR' AS STATUS, CONCAT('MySQL ERROR: ', @ERRNO, ': ', @MESSAGE_TEXT) AS MESSAGE;
    ROLLBACK;
END;

Answer 5

我简化了过程错误处理。

CREATE  PROCEDURE PROCNAME (
 IN  `ID` INT(11),
 OUT `MESSAGE` VARCHAR(500), 
 OUT `Q_STATUS` BOOLEAN)
BEGIN
 -- Error handling start here
 DECLARE EXIT HANDLER FOR SQLEXCEPTION
 BEGIN
    GET DIAGNOSTICS CONDITION 1 @ERRNO = MYSQL_ERRNO, @MESSAGE_TEXT = MESSAGE_TEXT;
    SET MESSAGE = CONCAT(@MESSAGE_TEXT," : Erro code - ",@ERRNO);
    SET Q_STATUS= 0;
    ROLLBACK; -- if any error occures it will rollback changes
 END;
 -- main query start here
 START TRANSACTION;
 SELECT IAM,ID; -- THIS WILL CAUSE OF ERROR 'UNKNOWN COLUMN IAM'
 SET Q_STATUS = 1; -- IF NO ERROR QUERY STATUS WILL GIVE YOU 1
 COMMIT; -- it is necessary in transaction 

END;

您也可以将此过程用作模板

您可以将错误代码与自定义错误消息分开，以便进一步处理错误。